In Cognitive radio (CR) applications Ultra-wideband (UWB) impulse radio (IR) signals can be designed
such as they can co-exist with licensed primary users. The pulse shape should be adjusted such that the
power spectral characteristics not only meet the Federal Communications Commission (FCC) constrains,
but also mitigate multiple narrow-band interference at the locations of existing primary users. In this
paper, the Parks-McClellan (PM) Algorithm and the Eigen Value Decomposition (EVD) approach for
UWB impulse radio waveform shaping are considered. The power spectral density (PSD) and the bit-errorrate
(BER) performance of the two methods are compared in the presence of single and double narrowband
interference (NBI). The interference rejection capabilities of the two methods are evaluated and
compared for different interference and additive noise levels. In particular, the simulations consider the
coexistence of practical IEEE 802.15.4a UWB systems with both IEEE 802.11 wireless LAN systems
operating at 5.2 GHz and radio location services operating at 8.5 GHz.
Integrated DWDM and MIMO-OFDM System for 4G High Capacity Mobile Communicatio...CSCJournals
Dense wavelength-division multiplexing (DWDM) technique is a very promising data transmission technology for utilizing the capacity of the fiber. By DWDM, multiple signals (video, audio, data etc) staggered in wavelength domain can be multiplexed and transmitted down the same fiber. The Multiple-input multiple-output (MIMO) wireless technology in combination with orthogonal frequency division multiplexing (MIMO-OFDM) is an attractive air-interface solution for next-generation wireless local area networks (WLANs) and fourth-generation mobile cellular wireless systems. This article provides an overview of the integrated DWDM MIMO-OFDM technology and focuses on DWDM transmitter design with adequate dispersion compensation for high data rate of 10Gbps ,MIMO-OFDM system design, space-time coded signaling, receiver design and performance analysis in terms of bit error rate for Integrated system. The simulation is carried out using powerful software tools Optisystem and MATLAB . In this paper a 64 channel DWDM system is simulated for transmission of baseband NRZ signal over fiber. Each of the transmission is at bit rate of 10 Gbps leading to high data rate transmission of 640 Gbps.The resultant Bit Error Rate(BER) is in the range 10-12 for DWDM system which is given as input to MIMO-OFDM system..This system performance is analyzed in terms of BER with SNR for Rayleigh, and AWGN channels and BER of 10-4 is achieved at SNR of 10dbs
Multiband Circular Microstrip Patch Antenna for WLAN Applicationtheijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
Channel characterization and modulation schemes of ultra wideband systemsijmnct
Channel measurements are generally the basis for channel models. Strictly speaking, channel models do
not exclusively require measurements, but it is a fact that all standardized models are derived from
measurements. This licentiate paper is focused on the characterization of ultra-wideband wireless channels.
The paper presents the characterization of ultra wide band system with their benefits and drawbacks within
the telecommunication industry. Furthermore with the advantages of Ultra wideband several modulation
techniques for UWB are discussed in this paper.
Design of Miniaturized Multiband Patch Antenna Using CSRR for WLAN/WiMAX Appl...TELKOMNIKA JOURNAL
A novel miniaturized multiband, single-feed microstrip patch antenna is presented in this paper for
WLAN and WiMAX applications. Both size reduction and multiband are obtained by etching the Multiple
Complementary Split Ring Resonators (MC-SRR) on the ground plane of the normal patch antenna. At
first, the normal patch antenna produces a single band of 5.15 GHz; 200 MHz (5.0500~5.2499).
Subsequently, a Single Circular Split Ring Resonator (SC-SRR) is etched on the ground plane and
produces a triple band of: 3.25 GHz; 288 MHz (3.1085~3.3964), 4.5 GHz; 101.3 MHz (4.4488~4.5501),
and 5.22 GHz; 220 MHz (5.1191~5.3400) and Double Single Circular Split Ring Resonator (DC-MCSRR)
with: 2.99 GHz; 60.7 MHz (2.9574~3.0181), 3.57 GHz; 324.7 MHz (3.4065~3.7312), and 5.1413 GHz;
115.4 MHz (5.0817~5.1971). The working bandwidths cover the desired frequency bands of WLAN
5.2 GHz and WiMAX 3.3/3.5 GHz. The proposed (MC-SRR) antenna can be employed to wireless
communication systems due to its simplicity in design, compactness and miniaturization.
Outage performance users located outside D2D coverage area in downlink cellul...journalBEEI
Device-to-device (D2D) communication has been proposed to employ the proximity between two devices to enhance the overall spectrum utilization of a crowded cellular network. With the help of geometric probability tools, this framework considers the performance of cellular users under spatial separation with the D2D pair is investigated. The measurement results and analytical expression of outage probability show that the proposed frameworks improve the outage performance at a high signal-tonoise ratio (SNR) at the base station. Results also interpret that the distances between nodes in the D2D-assisted network make slight impacts on the performance of the cellular user.
Integrated DWDM and MIMO-OFDM System for 4G High Capacity Mobile Communicatio...CSCJournals
Dense wavelength-division multiplexing (DWDM) technique is a very promising data transmission technology for utilizing the capacity of the fiber. By DWDM, multiple signals (video, audio, data etc) staggered in wavelength domain can be multiplexed and transmitted down the same fiber. The Multiple-input multiple-output (MIMO) wireless technology in combination with orthogonal frequency division multiplexing (MIMO-OFDM) is an attractive air-interface solution for next-generation wireless local area networks (WLANs) and fourth-generation mobile cellular wireless systems. This article provides an overview of the integrated DWDM MIMO-OFDM technology and focuses on DWDM transmitter design with adequate dispersion compensation for high data rate of 10Gbps ,MIMO-OFDM system design, space-time coded signaling, receiver design and performance analysis in terms of bit error rate for Integrated system. The simulation is carried out using powerful software tools Optisystem and MATLAB . In this paper a 64 channel DWDM system is simulated for transmission of baseband NRZ signal over fiber. Each of the transmission is at bit rate of 10 Gbps leading to high data rate transmission of 640 Gbps.The resultant Bit Error Rate(BER) is in the range 10-12 for DWDM system which is given as input to MIMO-OFDM system..This system performance is analyzed in terms of BER with SNR for Rayleigh, and AWGN channels and BER of 10-4 is achieved at SNR of 10dbs
Multiband Circular Microstrip Patch Antenna for WLAN Applicationtheijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
Channel characterization and modulation schemes of ultra wideband systemsijmnct
Channel measurements are generally the basis for channel models. Strictly speaking, channel models do
not exclusively require measurements, but it is a fact that all standardized models are derived from
measurements. This licentiate paper is focused on the characterization of ultra-wideband wireless channels.
The paper presents the characterization of ultra wide band system with their benefits and drawbacks within
the telecommunication industry. Furthermore with the advantages of Ultra wideband several modulation
techniques for UWB are discussed in this paper.
Design of Miniaturized Multiband Patch Antenna Using CSRR for WLAN/WiMAX Appl...TELKOMNIKA JOURNAL
A novel miniaturized multiband, single-feed microstrip patch antenna is presented in this paper for
WLAN and WiMAX applications. Both size reduction and multiband are obtained by etching the Multiple
Complementary Split Ring Resonators (MC-SRR) on the ground plane of the normal patch antenna. At
first, the normal patch antenna produces a single band of 5.15 GHz; 200 MHz (5.0500~5.2499).
Subsequently, a Single Circular Split Ring Resonator (SC-SRR) is etched on the ground plane and
produces a triple band of: 3.25 GHz; 288 MHz (3.1085~3.3964), 4.5 GHz; 101.3 MHz (4.4488~4.5501),
and 5.22 GHz; 220 MHz (5.1191~5.3400) and Double Single Circular Split Ring Resonator (DC-MCSRR)
with: 2.99 GHz; 60.7 MHz (2.9574~3.0181), 3.57 GHz; 324.7 MHz (3.4065~3.7312), and 5.1413 GHz;
115.4 MHz (5.0817~5.1971). The working bandwidths cover the desired frequency bands of WLAN
5.2 GHz and WiMAX 3.3/3.5 GHz. The proposed (MC-SRR) antenna can be employed to wireless
communication systems due to its simplicity in design, compactness and miniaturization.
Outage performance users located outside D2D coverage area in downlink cellul...journalBEEI
Device-to-device (D2D) communication has been proposed to employ the proximity between two devices to enhance the overall spectrum utilization of a crowded cellular network. With the help of geometric probability tools, this framework considers the performance of cellular users under spatial separation with the D2D pair is investigated. The measurement results and analytical expression of outage probability show that the proposed frameworks improve the outage performance at a high signal-tonoise ratio (SNR) at the base station. Results also interpret that the distances between nodes in the D2D-assisted network make slight impacts on the performance of the cellular user.
Circularly polarized antenna array based on hybrid couplers for 5G devicesjournalBEEI
This paper depicts a wideband circularly polarized (CP) antenna for 5G devices. The antenna array has a 3D structure including four simple printed dipole elements with directional radiations, high gain, and high efficiency. It achieves a CP by using the sequential rotation (SR) feeding based on 90°-3dB hybrid couplers in the proposed feeding network. The antenna array bandwidth is wide, 26.7%, with an operating frequency band from 3.35 GHz to 4.35 GHz. The antenna achieves a high peak gain of 10.73 dBi and high efficiency of 93.75%. Besides, the antenna gain is stable over the operating bandwidth (BW). At the centre operating frequency of 3.75 GHz, the angle of circular polarization is 51°. The antenna is designed and fabricated on the Rogers 4003 C substrate. The measured S11 is well matching with the simulation results. With the above characteristics, the proposed antenna can be a suitable candidate for 5G devices.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
A mitigation of channel crosstalk effect in dispersion shifted fiber based on...IJECEIAES
In fiber optics the Four Wave Mixing (FWM) has the harmful effect of an optical transmission system that can severely limit Wavelength Division Multiplexing (WDM) and reduce the transmission aptness. This work preset the durability of the different modulation format was tested to FWM by using Dispersion Shifted Fiber (DSF). Moreover, the performance of the proposed system is surveyed by changing the fiber length and applying an information rate of 200 Gb/s. The experimental results show that the FWM capacity has decreased significantly by more than 14 dB when applying Return to Zero (RZ) modulation form. In addition, in terms of the propsed system performance in the first channel and with 700 km distance, it was observed that the lower Bit Error Rate (BER) in the normal RZ modulation is equal to 1.3×10 -13 . As well as it is noticeable when applied the Non Return to Zero (NRZ), the Modified Duobinary Return to Zero (MDRZ) and Gaussian modulation, the system performance will be quickly changed and getting worse, where the BERs increased to 1.3×10 consecutively at same channel and for the same parameters. -4 , 1.3×10 -6 and 1.3×10 -2
In cellular mobile communication the usage of MIMO FSO antenna system has shown the
tremendous improvement in the quality of the signal. The MIMO system designed with the multiple transmitting
& receiving antennas will help to increase the overall output gain as gain is proportional to the product of M
transmitter and N receiver antennas‟. In MIMO free space optical communication the transmission of the optical
signal required the direct line of sight communication, where there should not be any obstacle in between the
transmission of the original signal. But in practicality meeting the above condition is more difficult as many
obstacles like bulding, mountain existing in between the transmission path of the signal. So in order to come up
with the solution for this problem we have to place the antennas‟ on height as on the top of the taller building,
on top of the mountain so that it will help to eliminate the obstacle in between the transmisition path and to meet
the criteria of the line of sight communication.
Beamforming with per antenna power constraint and transmit antenna selection ...sipij
In this paper, transmit beamforming and antenna selection techniques are presented for the Cooperative
Distributed Antenna System. Beamforming technique with minimum total weighted transmit power
satisfying threshold SINR and Per-Antenna Power constraints is formulated as a convex optimization
problem for the efficient performance of Distributed Antenna System (DAS). Antenna Selection technique is
implemented in this paper to select the optimum Remote Antenna Units from all the available ones. This
achieves the best compromise between capacity and system complexity. Dual polarized and Triple
Polarized systems are considered. Simulation results prove that by integrating Beamforming with DAS
enhances its performance. Also by using convex optimization in Antenna Selection enhances the
performance of multi polarized systems.
Engineering Research Publication
Best International Journals, High Impact Journals,
International Journal of Engineering & Technical Research
ISSN : 2321-0869 (O) 2454-4698 (P)
www.erpublication.org
Bandwidth enhancement of rectangular microstrip patch antenna using slotsIOSR Journals
In this paper, a new design of rectangular microstrip patch antenna (RMPA) without slot, with slots
and array is proposed and analyzed. The designed antenna has been simulated using HFSS software. The
simulated results for return loss, radiation pattern and gain are presented and discussed. The bandwidth of
proposed antenna is 2.4GHz-5.9GHz for VSWR(voltage standing wave ratio)<2><-
10dB return loss as an acceptable reference in wireless applications which cover worldwide interoperability for
microwave access (WiMAX) and wireless local area network (WLAN) and other applications. Gain of 10dB is
achieved for antenna array.
Prediction of path loss in a wireless system is important to determine its quality of service. Fluctuations
and variations of signal strength at higher frequency range in Near Field zone, is a common difficulty to
achieve higher data rate. Continuous variation in signal causes decay of strength by the interference of the
atmospheric obstructions and hence electric field intensity gradually decreases with the distance. In this
paper the behaviour of field strength is explored through AWAS Electromagnetic Code which predicts the
rapid variations in electric field intensity irrespective of environment as compare to statistical models
which do not capture the variations as per Environment. An adequate and optimum values of these
parameters is essential for efficient transmission. The results show that the numerical analysis predicts
much lower field strengths which could significantly affect the channel quality. . This investigation is
essential to reduce the rapid fluctuations in field strength of the WiMAX.
ENERGY EFFICIENT SMALL CELL NETWORKS USING DYNAMIC CLUSTERINGIJARIDEA Journal
Abstract— Clustering approach that fuses, past established area based measurements, the impacts of the time-differing BS stack. Grouping empowers intra-bunch coordination among the base stations with the end goal of streamlining the downlink execution by means of load adjusting. Because of between group impedance, the bunches need to rival each other to settle on choices on enhancing the vitality proficiency by means of a dynamic decision of rest and dynamic states.
Keywords— Energy Efficiency, Small Cell Networks.
Optimal Transmit Power and Packet Size in Wireless Sensor Networks in Shadowe...IDES Editor
This paper investigates the effects of
shadowing on the optimal transmit power required to
sustain the network connectivity while maintaining a
predefined maximum tolerable Bit Error Rate (BER) in
a Wireless Sensor Networks (WSN). Optimization of
transmit power is of great importance in WSN since
sensor nodes are battery driven and optimization helps
to increase battery life by reducing inter node
interference significantly. An infinite Automatic Repeat
Request (ARQ) model has been considered to assess the
impact of shadowing and other network conditions on
energy requirement for successful packet transmission in
WSN. We also find the optimal packet length based on
energy efficiency. Effects of shadowing on optimal packet
size and energy efficiency in packetized data
transmission are also investigated. Further energy
consumption is minimized considering a variable packet
length based transmission. Use of optimal packet size
shows a significant reduction in energy spending.
Realization of Dual-Dipole-Antenna System for Concurrent Dual-Radio Operation...Saou-Wen Su
The study of the mutual coupling between the two simple strip dipole antennas is first carried out and investigated. The results show that the coupling or the antenna port isolation is almost separation distance independent when the two dipole antennas are arranged to be of orthogonal polarization. Following this characteristic, a novel dual-dipole-antenna system aimed for concurrent 2.4 and 5 GHz band operation and at the same time, to achieve very compact integration of two individual antennas with separate feeds is proposed. The two dipole antennas are etched on a two-layered dielectric substrate with dimensions 30 mm × 30 mm. On the front layer is put the 2.4 GHz dipole, which is perpendicular to the 5 GHz dipole located on the bottom layer. Though the two dipoles are stacked up with a distance of 0.8 mm only, port isolation can still be below –15 dB. The proposed dual-dipole-antenna system is a promising candidate for the antenna solution that enables simultaneous dual-radio operation.
Long term evolution (LTE) is replacing the 3G services slowly but steadily and become a preferred choice
for data for human to human (H2H) services and now it is becoming preferred choice for voice also. In
some developed countries the traditional 2G services gradually decommissioned from the service and
getting replaced with LTE for all H2H services. LTE provided high downlink and uplink bandwidth
capacity and is one of the technology like mobile ad hoc network (MANET) and vehicular ad hoc network
(VANET) being used as the backbone communication infrastructure for vehicle networking applications.
When Compared to VANET and MANET, LTE provides wide area of coverage and excellent infrastructure
facilities for vehicle networking. This helps in transmitting the vehicle information to the operator and
downloading certain information into the vehicle nodes (VNs) from the operators server. As per the ETSI
publications the number of machine to machine communication (MTC) devices are expected to touch 50
billion by 2020 and this will surpass H2H communication. With growing congestion in the LTE network,
accessing the network for any request from VN especially during peak hour is a big challenge because of
the congestion in random access channel (RACH). In this paper we will analyse this RACH congestion
problem with the data from the live network. Lot of algorithms are proposed for resolving the RACH
congestion on the basis of simulation results so we would like to present some practical data from the live
network to this issue to understand the extent RACH congestion issue in the real time scenario.
SELECTION OF SPECTRUM SENSING METHOD TO ENHANCE QOS IN COGNITIVE RADIO NETWORKSijwmn
The massively increasing number of wireless communication devices has led to considerable growths in
radio traffic density, resulting in a predictable shortage of the available spectrum. To address this potential
shortage, the Cognitive Radio (CR) technology offers promising solutions that aim to improve the spectrum
utilization. The operation of CR relies on detecting the so-called spectrum holes, i.e., the frequency bands
when they are unoccupied by their licensed operators. The unlicensed users are then allowed to
communicate using these spectrum holes. Consequently, the performance of CR is highly dependent on the
employed spectrum sensing methods. Several sensing methods are already available or literarily proposed.
However, no individual method can accommodate all possible CR operation scenarios. Hence, it is fair to
ascertain that the performance of a CR device can be improved if it is capable of supporting several
sensing methods. Then it should be able to effectively select the most suitable method. In this paper, several
spectrum sensing methods are compared and analyzed, aiming to identify their advantages and
shortcomings in different CR operating conditions. Furthermore, it identifies the factors that need to be
considered while selecting a proper sensing method from the catalog of available methods.
EFFECTS OF FILTERS ON THE PERFORMANCE OF DVB-T RECEIVERijwmn
Digital Video Broadcasting-Terrestrial (DVB-T) is an international standard for digital television
services. Orthogonal Frequency Division Multiplexing (OFDM) is the core of this technology. OFDM
based system like DVB-T can handle multipath fading and hence it can minimize Inter Symbol
Interference (ISI). DVB-T has some limitations too namely large dynamic range of the signals and
sensitivity to frequency error. In order to overcome these limitations DVB-T receivers should be optimally
designed. In this paper we address the issues related to optimal DVB-T receiver design. There of several
signal processing units in a DVB-T receiver. A low-pass filter is one of them. In this paper, we consider
some classic filters namely Butterworth, Chebyshev, and elliptic in the DVB-T receiver. The effects of
different filters on the performances of DVB-T receiver have been investigated and compared in this
paper under AWGN channel condition
ROUTING PROTOCOLS FOR DELAY TOLERANT NETWORKS: SURVEY AND PERFORMANCE EVALUATIONijwmn
Delay Tolerant Networking (DTN) is a promising technology that aims to provide efficient communication
between devices in a network with no guaranteed continuous connectivity. Most existing routing schemes
for DTNs exploit the advantage of message replication to achieve high message delivery rate. However,
these schemes commonly suffer from large communication overhead due to the lack of efficient mechanisms
to control message replication. In this paper we give a brief survey on routing protocols designed for
DTNs, and evaluate the performance of several representative routing protocols including Epidemic, Spray
and Wait, PRoPHET, and 3R through extensive trace-driven simulations. Another objective of this work is
to evaluate the security strength of different routing schemes under common DTN attacks such as the black
hole attack. The results and analysis presented in this paper can provide useful guidance on the design and
selection of routing protocols for given delay-tolerant applications.
Circularly polarized antenna array based on hybrid couplers for 5G devicesjournalBEEI
This paper depicts a wideband circularly polarized (CP) antenna for 5G devices. The antenna array has a 3D structure including four simple printed dipole elements with directional radiations, high gain, and high efficiency. It achieves a CP by using the sequential rotation (SR) feeding based on 90°-3dB hybrid couplers in the proposed feeding network. The antenna array bandwidth is wide, 26.7%, with an operating frequency band from 3.35 GHz to 4.35 GHz. The antenna achieves a high peak gain of 10.73 dBi and high efficiency of 93.75%. Besides, the antenna gain is stable over the operating bandwidth (BW). At the centre operating frequency of 3.75 GHz, the angle of circular polarization is 51°. The antenna is designed and fabricated on the Rogers 4003 C substrate. The measured S11 is well matching with the simulation results. With the above characteristics, the proposed antenna can be a suitable candidate for 5G devices.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
A mitigation of channel crosstalk effect in dispersion shifted fiber based on...IJECEIAES
In fiber optics the Four Wave Mixing (FWM) has the harmful effect of an optical transmission system that can severely limit Wavelength Division Multiplexing (WDM) and reduce the transmission aptness. This work preset the durability of the different modulation format was tested to FWM by using Dispersion Shifted Fiber (DSF). Moreover, the performance of the proposed system is surveyed by changing the fiber length and applying an information rate of 200 Gb/s. The experimental results show that the FWM capacity has decreased significantly by more than 14 dB when applying Return to Zero (RZ) modulation form. In addition, in terms of the propsed system performance in the first channel and with 700 km distance, it was observed that the lower Bit Error Rate (BER) in the normal RZ modulation is equal to 1.3×10 -13 . As well as it is noticeable when applied the Non Return to Zero (NRZ), the Modified Duobinary Return to Zero (MDRZ) and Gaussian modulation, the system performance will be quickly changed and getting worse, where the BERs increased to 1.3×10 consecutively at same channel and for the same parameters. -4 , 1.3×10 -6 and 1.3×10 -2
In cellular mobile communication the usage of MIMO FSO antenna system has shown the
tremendous improvement in the quality of the signal. The MIMO system designed with the multiple transmitting
& receiving antennas will help to increase the overall output gain as gain is proportional to the product of M
transmitter and N receiver antennas‟. In MIMO free space optical communication the transmission of the optical
signal required the direct line of sight communication, where there should not be any obstacle in between the
transmission of the original signal. But in practicality meeting the above condition is more difficult as many
obstacles like bulding, mountain existing in between the transmission path of the signal. So in order to come up
with the solution for this problem we have to place the antennas‟ on height as on the top of the taller building,
on top of the mountain so that it will help to eliminate the obstacle in between the transmisition path and to meet
the criteria of the line of sight communication.
Beamforming with per antenna power constraint and transmit antenna selection ...sipij
In this paper, transmit beamforming and antenna selection techniques are presented for the Cooperative
Distributed Antenna System. Beamforming technique with minimum total weighted transmit power
satisfying threshold SINR and Per-Antenna Power constraints is formulated as a convex optimization
problem for the efficient performance of Distributed Antenna System (DAS). Antenna Selection technique is
implemented in this paper to select the optimum Remote Antenna Units from all the available ones. This
achieves the best compromise between capacity and system complexity. Dual polarized and Triple
Polarized systems are considered. Simulation results prove that by integrating Beamforming with DAS
enhances its performance. Also by using convex optimization in Antenna Selection enhances the
performance of multi polarized systems.
Engineering Research Publication
Best International Journals, High Impact Journals,
International Journal of Engineering & Technical Research
ISSN : 2321-0869 (O) 2454-4698 (P)
www.erpublication.org
Bandwidth enhancement of rectangular microstrip patch antenna using slotsIOSR Journals
In this paper, a new design of rectangular microstrip patch antenna (RMPA) without slot, with slots
and array is proposed and analyzed. The designed antenna has been simulated using HFSS software. The
simulated results for return loss, radiation pattern and gain are presented and discussed. The bandwidth of
proposed antenna is 2.4GHz-5.9GHz for VSWR(voltage standing wave ratio)<2><-
10dB return loss as an acceptable reference in wireless applications which cover worldwide interoperability for
microwave access (WiMAX) and wireless local area network (WLAN) and other applications. Gain of 10dB is
achieved for antenna array.
Prediction of path loss in a wireless system is important to determine its quality of service. Fluctuations
and variations of signal strength at higher frequency range in Near Field zone, is a common difficulty to
achieve higher data rate. Continuous variation in signal causes decay of strength by the interference of the
atmospheric obstructions and hence electric field intensity gradually decreases with the distance. In this
paper the behaviour of field strength is explored through AWAS Electromagnetic Code which predicts the
rapid variations in electric field intensity irrespective of environment as compare to statistical models
which do not capture the variations as per Environment. An adequate and optimum values of these
parameters is essential for efficient transmission. The results show that the numerical analysis predicts
much lower field strengths which could significantly affect the channel quality. . This investigation is
essential to reduce the rapid fluctuations in field strength of the WiMAX.
ENERGY EFFICIENT SMALL CELL NETWORKS USING DYNAMIC CLUSTERINGIJARIDEA Journal
Abstract— Clustering approach that fuses, past established area based measurements, the impacts of the time-differing BS stack. Grouping empowers intra-bunch coordination among the base stations with the end goal of streamlining the downlink execution by means of load adjusting. Because of between group impedance, the bunches need to rival each other to settle on choices on enhancing the vitality proficiency by means of a dynamic decision of rest and dynamic states.
Keywords— Energy Efficiency, Small Cell Networks.
Optimal Transmit Power and Packet Size in Wireless Sensor Networks in Shadowe...IDES Editor
This paper investigates the effects of
shadowing on the optimal transmit power required to
sustain the network connectivity while maintaining a
predefined maximum tolerable Bit Error Rate (BER) in
a Wireless Sensor Networks (WSN). Optimization of
transmit power is of great importance in WSN since
sensor nodes are battery driven and optimization helps
to increase battery life by reducing inter node
interference significantly. An infinite Automatic Repeat
Request (ARQ) model has been considered to assess the
impact of shadowing and other network conditions on
energy requirement for successful packet transmission in
WSN. We also find the optimal packet length based on
energy efficiency. Effects of shadowing on optimal packet
size and energy efficiency in packetized data
transmission are also investigated. Further energy
consumption is minimized considering a variable packet
length based transmission. Use of optimal packet size
shows a significant reduction in energy spending.
Realization of Dual-Dipole-Antenna System for Concurrent Dual-Radio Operation...Saou-Wen Su
The study of the mutual coupling between the two simple strip dipole antennas is first carried out and investigated. The results show that the coupling or the antenna port isolation is almost separation distance independent when the two dipole antennas are arranged to be of orthogonal polarization. Following this characteristic, a novel dual-dipole-antenna system aimed for concurrent 2.4 and 5 GHz band operation and at the same time, to achieve very compact integration of two individual antennas with separate feeds is proposed. The two dipole antennas are etched on a two-layered dielectric substrate with dimensions 30 mm × 30 mm. On the front layer is put the 2.4 GHz dipole, which is perpendicular to the 5 GHz dipole located on the bottom layer. Though the two dipoles are stacked up with a distance of 0.8 mm only, port isolation can still be below –15 dB. The proposed dual-dipole-antenna system is a promising candidate for the antenna solution that enables simultaneous dual-radio operation.
Long term evolution (LTE) is replacing the 3G services slowly but steadily and become a preferred choice
for data for human to human (H2H) services and now it is becoming preferred choice for voice also. In
some developed countries the traditional 2G services gradually decommissioned from the service and
getting replaced with LTE for all H2H services. LTE provided high downlink and uplink bandwidth
capacity and is one of the technology like mobile ad hoc network (MANET) and vehicular ad hoc network
(VANET) being used as the backbone communication infrastructure for vehicle networking applications.
When Compared to VANET and MANET, LTE provides wide area of coverage and excellent infrastructure
facilities for vehicle networking. This helps in transmitting the vehicle information to the operator and
downloading certain information into the vehicle nodes (VNs) from the operators server. As per the ETSI
publications the number of machine to machine communication (MTC) devices are expected to touch 50
billion by 2020 and this will surpass H2H communication. With growing congestion in the LTE network,
accessing the network for any request from VN especially during peak hour is a big challenge because of
the congestion in random access channel (RACH). In this paper we will analyse this RACH congestion
problem with the data from the live network. Lot of algorithms are proposed for resolving the RACH
congestion on the basis of simulation results so we would like to present some practical data from the live
network to this issue to understand the extent RACH congestion issue in the real time scenario.
SELECTION OF SPECTRUM SENSING METHOD TO ENHANCE QOS IN COGNITIVE RADIO NETWORKSijwmn
The massively increasing number of wireless communication devices has led to considerable growths in
radio traffic density, resulting in a predictable shortage of the available spectrum. To address this potential
shortage, the Cognitive Radio (CR) technology offers promising solutions that aim to improve the spectrum
utilization. The operation of CR relies on detecting the so-called spectrum holes, i.e., the frequency bands
when they are unoccupied by their licensed operators. The unlicensed users are then allowed to
communicate using these spectrum holes. Consequently, the performance of CR is highly dependent on the
employed spectrum sensing methods. Several sensing methods are already available or literarily proposed.
However, no individual method can accommodate all possible CR operation scenarios. Hence, it is fair to
ascertain that the performance of a CR device can be improved if it is capable of supporting several
sensing methods. Then it should be able to effectively select the most suitable method. In this paper, several
spectrum sensing methods are compared and analyzed, aiming to identify their advantages and
shortcomings in different CR operating conditions. Furthermore, it identifies the factors that need to be
considered while selecting a proper sensing method from the catalog of available methods.
EFFECTS OF FILTERS ON THE PERFORMANCE OF DVB-T RECEIVERijwmn
Digital Video Broadcasting-Terrestrial (DVB-T) is an international standard for digital television
services. Orthogonal Frequency Division Multiplexing (OFDM) is the core of this technology. OFDM
based system like DVB-T can handle multipath fading and hence it can minimize Inter Symbol
Interference (ISI). DVB-T has some limitations too namely large dynamic range of the signals and
sensitivity to frequency error. In order to overcome these limitations DVB-T receivers should be optimally
designed. In this paper we address the issues related to optimal DVB-T receiver design. There of several
signal processing units in a DVB-T receiver. A low-pass filter is one of them. In this paper, we consider
some classic filters namely Butterworth, Chebyshev, and elliptic in the DVB-T receiver. The effects of
different filters on the performances of DVB-T receiver have been investigated and compared in this
paper under AWGN channel condition
ROUTING PROTOCOLS FOR DELAY TOLERANT NETWORKS: SURVEY AND PERFORMANCE EVALUATIONijwmn
Delay Tolerant Networking (DTN) is a promising technology that aims to provide efficient communication
between devices in a network with no guaranteed continuous connectivity. Most existing routing schemes
for DTNs exploit the advantage of message replication to achieve high message delivery rate. However,
these schemes commonly suffer from large communication overhead due to the lack of efficient mechanisms
to control message replication. In this paper we give a brief survey on routing protocols designed for
DTNs, and evaluate the performance of several representative routing protocols including Epidemic, Spray
and Wait, PRoPHET, and 3R through extensive trace-driven simulations. Another objective of this work is
to evaluate the security strength of different routing schemes under common DTN attacks such as the black
hole attack. The results and analysis presented in this paper can provide useful guidance on the design and
selection of routing protocols for given delay-tolerant applications.
A Grouped System Architecture for Smart Grids Based AMI Communications Over LTE ijwmn
A smart grid based Advanced Metering Infrastructure (AMI), is a technology that enables the utilities to
monitor and control the electricity consumption through a set of various smart meters (SMs) connected via
a two way communication infrastructure. One of the key challenges for smart grids is how to connect a
large number of devices. On the other hand, 4G Long Term Evolution (LTE), the latest standard for mobile
communications, was developed to provide stable service performance and higher data rates for a large
number of mobile users. Therefore, LTE is considered a promising solution for wide area connectivity for
SMs. In this paper, a grouped hierarchal architecture for SMs communications over LTE is introduced.
Then, an efficient grouped scheduling technique is proposed for SMs transmissions over LTE. The
proposed architecture efficiently solves the overload problem due to AMI traffic and guarantees a full
monitoring and control for energy consumption. The results of our suggested solution showed that LTE can
serve better for smart grids based AMI with particular grouping and scheduling scheme. In addition, the
presented technique can able to be used in urban areas having high density of SMs.
DISCRETE COSINETRANSFORM-II FOR REDUCTION IN PEAK TO AVERAGE POWER RATIO OF O...ijwmn
Orthogonal frequency Division multiplexing (OFDM) is the most familiar word in telecommunication
and wireless communication systems as it provides enhanced spectral efficiency than Frequency division
multiplexing (FDM).Although it is sustaining an orthogonal relation betweencarriers but high peak to
average power ratio (PAPR) is one of the main disadvantages of OFDM system.Various PAPR reduction
techniques have been used, including techniques based on companding. Incompanding, -Law
companding has potential to reduce the PAPR of OFDMsignals. -Law Companding technique
preserves the dynamic range of samples at low amplitudes.A new method named as precoding which is
having less complexity compared to the other power reduction techniques is proposed to reduce PAPR.
This paper put forward combination of two existing techniques namely -Law Companding Transform
and Discrete Cosine Transform-II precoding technique. The simulation results show that, the proposed
combinedscheme gives better result for PAPR Reduction and results in no distortion.
The delivering of both good quality of service (QoS) and Grade of Service (GoS) in any competitive mobile
communication environment is a major factor to reducing subscribers’ churn rate. Therefore, it is
important for wireless mobile network operators to ensure stability and efficiency by delivering a
consistent, reliable and high-quality end user (subscriber) satisfaction. This can only be achieve by
conducting a regular network performance monitoring and optimisation as it directly impacts the quality of
the offered services and hence user satisfaction. In this paper, we present the results of network
performance evaluation and optimisation of a GSM network on cell cluster-basis, in Asaba region, South
East Nigeria. We employ a combination of essential key performance indicators such as dropped call rate,
call setup success rate and outage call rate to examine overall QoS and GoS performance of the GSM
network. Our results after network optimisation showed significant performance improvement in terms of
call drop rate, call set up success rate, and call block rate across. Specifically, the end user satisfaction
rate has increased from 94.45%, 87.74%, and 92.85% to 99.05%, 95.38% and 99.03% respectively across
the three GSM cell clusters. The GoS is reduced from 3.33%, 6.60% and 2.38% to 0.00%, 3.70% and
0.00% respectively. Furthermore, ESA, which correspond end points service availability, has improved
from 94.44%, 93.40% and 97.62% to 100%, 96.30% and 100% respectively. In addition, the average
throughput has improved from 73.74kbits/s, 85.06kbits/s and 87.54kbits/s to 77.07kbits/s, 92.38kbits/s and
102kbits/s respectively across the three GSM cell clusters.
DYNAMIC OPTIMIZATION OF OVERLAP-AND-ADD LENGTH OVER MIMO MBOFDM SYSTEM BASED ...ijwmn
An important role performed by Zero Padding (ZP) in multi-band OFDM (MB-OFDM) System. This role
show for low-complexity in résistance against multipath interference by reducing inter-carrier interference
(ICI) and eliminating the inter-symbol interference (ISI) Also, zero-padded suffix can be used to eliminate
ripples in the power spectral density in order to conform to FCC requirements. At the receiver of MB-OFDM system needs to use of a technique called as overlap-and-add (OLA). Which maintain the circular convolution property and take the multipath energy of the channel.In this paper, we proposed a method of performing overlap-and-add length for zero padded suffixes. Then,we studied the effect of this method, dynamic optimization of overlap-and-add (OLA) equalization, on the performance of MIMO MBOFDM system on Bit Error Rate (BER) with AWGN channel and SalehValenzuela (S-V) Multipath channel Model.In the dynamic optimization OLA, the Length of ZP depends on length of channel impulse response (CIR).
These measures, based on SNR, insert the ZP according to the measurement.Dynamic optimization of length of ZP improves the Performance of MIMO MBOFDM system. In fact wedeveloped a technique to select the length of ZP as function of SNR and CIR estimate. In our simulation
this technique improve to 0.6 dB at BER=10-2 with a multipath channels CM4
Performance analysis and implementation for nonbinary quasi cyclic ldpc decod...ijwmn
Non-binary low-density parity check (NB-LDPC) codes are an extension of binary LDPC codes with
significantly better performance. Although various kinds of low-complexity iterative decoding algorithms
have been proposed, there is a big challenge for VLSI implementation of NBLDPC decoders due to its high
complexity and long latency. In this brief, highly efficient check node processing scheme, which the
processing delay greatly reduced, including Min-Max decoding algorithm and check node unit are
proposed. Compare with previous works, less than 52% could be reduced for the latency of check node
unit. In addition, the efficiency of the presented techniques is design to demonstrate for the (620, 310) NBQC-
LDPC decoder.
S URVEY OF L TE D OWNLINK S CHEDULERS A LGORITHMS IN O PEN A CCESS S IM...ijwmn
he LTE/LTE-A has become a catchphrase for research
and lot of research are being conducted and
carried out in LTE in various issues by various peo
ple. New tools are developed and introduced in the
market to interpret the results of the new algorith
ms proposed by various people. Some tools are open
access which are free to use but some tools are pro
duced by the companies which are not open access. I
n
this paper some of the open access simulation tools
like LTE-Sim and NS-3 are analyzed and LTE downlin
k
scheduler algorithms are simulated using those tool
s. In LTE systems, the downlink scheduler is an
important component for radio resource management;
hence in the context of LTE simulation, a study
between the downlink scheduler models between the s
imulators are performed.
Design and analysis of high gain diode predistortionijwmn
This paper presents the design and analysis of a high gain, broadband Schottky and PIN diode based RF
pre-distortion linearizer for TWTA. The circuit is using ABCD matrix approach. The simulation is
performed using Agilent ADS software. We have proposed a new linearizer circuit which can achieve a
high gain compared to existing linearizer designs.
Performance evaluation of different spectrum sensing techniques for realistic...ijwmn
In this paper, the performance assessment of five different detection techniques from spectrum sensing
perspective in cognitive radio networks is proposed and implemented using the realistic implementation
oriented model (R-model) with signal processing operations. The performance assessment of the different
sensing techniques in the existence of unknown or imprecisely known impulsive noise levels is done by
considering the signal detection in cognitive radio networks under a non-parametric multisensory detection
scenario. The examination focuses on performance comparison of basic spectrum sensing mechanisms as,
energy detection (ED) and cyclostationary feature detection (CSFD) along with the eigenvalue-based
detection methods namely, Maximum-minimum eigenvalue detection (MMED), Roy’s largest Root Test
(RLRT) which requires knowledge of the noise variance and Generalized Likelihood Ratio Test (GLRT)
which can be implemented as a test of the largest eigenvalues vs. Maximum-likelihood estimates a noise
variance. From simulation results it is observed that the detection performance of the GLRT method is
better than the other techniques in realistic implementation oriented model.
Wireless sensor nodes are usually deployed in not easily accessible places to provide solution to a wide
range of application such as environmental, medical and structural monitoring. They are spatially
distributed and as a result are usually powered from batteries. Due to the limitation in providing power
with batteries, which must be manually replaced when they are depleted, and location constraints in
wireless sensor network causes a major setback on performance and lifetime of WSNs. This difficulty in
battery replacement and cost led to a growing interest in energy harvesting. The current practice in energy
harvesting for sensor networks is based on practical and simulation approach. The evaluation and
validation of the WSN systems is mostly done using simulation and practical implementation. Simulation is
widely used especially for its great advantage in evaluating network systems. Its disadvantages such as the
long time taken to simulate and not being economical as it implements data without proper analysis of all
that is involved ,wasting useful resources cannot be ignored. In most times, the energy scavenged is directly
wired to the sensor nodes. We, therefore, argue that simulation – based and practical implementation of
WSN energy harvesting system should be further strengthened through mathematical analysis and design
procedures. In this work, we designed and modeled the energy harvesting system for wireless sensor nodes
based on the input and output parameters of the energy sources and sensor nodes. We also introduced the
use of supercapacitor as buffer and intermittent source for the sensor node. The model was further tested in
a Matlab environment, and found to yield a very good approach for system design.
An efficient model for reducing soft blocking probability in wireless cellula...ijwmn
One of the research challenges in cellular networks is the design of an efficient model that can reduce call
blocking probability and improve the quality of service (QoS) provided to mobile users. Blocking occurs
when a new call cannot be admitted into the network due to channel unavailability caused by limited
capacity or when an ongoing call cannot be continued as it moves from one base station to another due to
mobility of the user. The proposed model computes the steady state probability and resource occupancy
distribution, traffic distribution, intra-cell and inter-cell interferences from mobile users. Previously
proposed models are reviewed through which the present model is built for use in emerging wireless
networks so as to obtain improved QoS performance. The developed model is validated through simulations
in MATLAB and its equations implemented using Java Programming Language. The results obtained
indicate reduced call blocking probability below threshold.
Cube satellite missions perform innovative scientific experiments on a low cost developmental platform but
have an inherent limitation of size and space. This restricts the total available solar power that can be
harnessed and as a result, the radio links operate on stringent power budgets. For improving the available
margins for communication in such satellites, it is desirable to improve upon the antenna system
performance at the ground station used for the establishment of the links with the satellite. This can be
achieved by improving the forward gain, the forward to backward ratio and the directivity of the antenna.
This paper describes the electrical simulations and the performance evaluation of the one unit, two unit and
four unit circularly polarized crossed Yagi-Uda antenna array designed for communication with amateur
radio (HAM) satellites operating over the 434 MHz to 438 MHz Amateur UHF band. The electro-magnetic
model has been developed using the 4NEC2 software. The simulations have been validated with the
practical field testing performed for estimating the SWR, antenna gain, the forward to backward ratio and
radiation pattern for the antenna system.
A COGNITIVE RADIO SCHEME FOR DYNAMIC RESOURCE ALLOCATION BASED ON QOEijwmn
This paper introduces a cognitive radio scheme based on quality of experience (QoE). QoE involves the
mobile end user’s preferences. Considering QoE can lead to an improved cognitive radio resource
management strategy. The cognitive radio scheme aims to manage the traffic flow in dynamic systems; it is
a new way of thinking about dynamic resource management in cellular systems. The Use of the cognitive
radio techniques in cellular systems will improve the resource assignment in wireless communication. The
cognitive radio is a self-aware communication system that aims to use the resource assignment in an
efficient way. The proposed algorithm is very successful at handling the call-blocking rate based on QoS
and QoE.
A novel energy efficient routing algorithm for wireless sensor networks using...ijwmn
There are numerous applications for wireless sensor networks which are inevitable now a day in our daily
life. Majority of such applications which use wireless sensor networks will be in areas where the direct
human intervention is impossible. So the limited energy available in such sensors is a threat for prolonging
the life of the entire network. The need of energy efficiency in wireless sensor networks is a hot research
topic in which lot of new strategies for improvement in energy efficiency has been sought after. As
communication process consumes more energy, an energy efficient routing strategy can probably reduce
the energy consumption to a great extend. This paper gives an overview of the different routing techniques
in which mobile sinks are used to facilitate the routing process which can effectively reduce the energy use.
A new routing strategy with mobile sinks and a static sink is proposed and is compared based on the
matrices life time and average energy of the nodes with the existing Shortest Hop path (SH) algorithm. The
simulation results shows the proposed algorithm is more energy efficient than the existing one.
Approximation of Gaussian derivatives for UWB communicationijsrd.com
UWB is a new interesting technology for wireless communications. It can replace traditionally carrier-based radio transmission by pulse-based transmission using ultrawide band frequency but at a very low energy. An important aspect of research in this domain is to find a pulse with an optimal shape, whose power spectral density respects and best fits emission limitation mask imposed by FCC. In this paper we review common used Gaussian pulses and its derivatives and the influence of shape factor, finding an optimal specific value for each derivative. Next, we search to obtain possible better pulse shapes as linear combinations of Gaussian derivatives. Older studies refer in one case to the same shape factor for all derivatives and in other case to higher factor for first derivative and smaller shape factors for subsequent derivatives. Our new idea is to use Gaussian derivatives, each with its specific optimal shape factor and to use a "trial and error" algorithm to obtain a linear combination pulse with better performance.
Compressive spectrum sensing using two-stage scheme for cognitive radio netwo...IJECEIAES
The modern applications of communications that use wideband signals suffer the lacking since the resources of this kind of signals are limited especially for fifth generation (5G). The compressive spectrum sensing (COMPSS) techniques address such issues to reuse the detected signals in the networks and applications of 5G. However, the raw techniques of COMPSS have low compression ratio and high computational complexity rather than high level of noise variance. In this paper, a hybrid COMPSS scheme has been developed for both non-cooperative and cooperative cognitive radio networks. The proposed scheme compiles on discrete wavelet transform single resolution (DWT-SR) cascaded with discrete cosine transform (DCT). The first is constructed according to the pyramid algorithm to achieve 50% while the second performed 30% compression ratios. The simulation and analytic results reveal the significant detection performance of the proposed technique is better than that of the raw COMPSS techniques.
Broad-Spectrum Model for Sharing Analysis between IMTAdvanced Systems and FSS...IOSRJECE
An appraisal of orthogonal frequency division multiplexing (OFDM) accredited for IMT-Advanced has been well thought-out in this letter. Derivation of the power spectral density (PSD) produce new model which easily assess the interfering signal power that appears in the band of a victim system without a spectrum emission mask. Furthermore, the broad-spectrum investigative model (BIM) can assess the interference from the 4G systems into FSS systems, when transmit power is unallocated to some sub-carriers overlapping the band of the victim system. Closed form is derived to create the model.
Bandwidth density optimization of misaligned optical interconnectsIJECEIAES
In this paper, the bandwidth density of misaligned free space optical interconnects (FSOIs) system with and without coding under a fixed bit error rate is considered. In particular, we study the effect of using error correction codes of various codeword lengths on the bandwidth density and misalignment tolerance of the FSOIs system in the presence of higher order modes. Moreover, the paper demonstrates the use of the fill factor of the detector array as a design parameter to optimize the bandwidth density of the communication. The numerical results demonstrate that the bandwidth density improves significantly with coding and the improvement is highly dependent on the used codeword length and code rate. In addition, the results clearly show the optimum fill factor values that achieve the maximum bandwidth density and misalignment tolerance of the system.
Performance Analysis of Ultra Wideband Communication SystemEditor IJMTER
Ultra-Wideband (UWB) is a radio transmission scheme that uses extremely low power
pulses of radio energy spread across a wide spectrum of frequencies. UWB has several advantages
over conventional continuous wave radio communications including potential support for high data
rates, robustness to multipath interference and fading. The paper covers Ultra Wide-Band
technology. General description, Challenges, various modulation schemes such as OOK, PAM,
PPM, and BPSK under specified Ultra Wide Band regimes: low Power spectral density, large
spreading ratio and a highly dispersive channel. The capacity and BER performance of a single user
ultra wideband communication is investigated for various modulation schemes and coded, uncoded
methods also simulated. Fading channel like Ricean and Rayleigh are compared. Channelized digital
receiver concept is discussed.
Semi-circular compact CPW-fed antenna for ultra-wideband applicationsTELKOMNIKA JOURNAL
This paper presents a simple structure and small size antenna design with dimensions of 43×47 mm2 to perform an ultra-wideband (UWB) frequency range using a semicircular co-planar waveguide (CPW). This antenna has been designed and simulated by the computer simulation technology (CST) microwave studio suit. In this work, we design an ultra-wideband antenna (about 2 GHz to 10 GHz) by feeding a semi-circular compact antenna via a co-planar waveguide for input impedance of 50 Ω. The CST simulation results show that our designed antenna has a very good impedance and radiation characteristic within the intended ultra-wideband. Because of the small size and the suitable shape, this antenna can be used in many wireless communication applications, such as a radio frequency identifier (RFID), indoor wireless local area network or wireless fidelity (WiFi), internet of things (IoT), millimeter waves communications (mmWave), global positioning system (GPS), and many applications of 6G systems.
Experimental Study for the Different Methods of Generating Millimeter WavesIJERA Editor
In this paper a analytical comparison and experimental implementation of different methods used in generating a low phase noise millimeter wave signals is presented. Four techniques were experimented and compared, Multiplication, phase lock loop (PLL), Injection locking (IL), and Injection locking with phase lock loop (ILPLL). The comparison and experimental results of a laboratory discussed.
3D METALLIC PLATE LENS ANTENNA BASED BEAMSPACE CHANNEL ESTIMATION TECHNIQUE F...ijwmn
Beamspace channel estimation mechanism for massive MIMO (multiple input multiple output) antenna
system presents a major process to compensate the 5G spectrum challenges caused by the proliferation of
information from mobile devices. However, this estimation is required to ensure the perfect channel state
information (CSI) for lower amount of Radio Frequency (RF) chains for each beam. In addition, phase
shifter (PS) components used in this estimation need high power to select the beam in the desired direction.
To overcome these limitations, in this work, we propose Regular Scanning Support Detection (RSSD)
based channel estimation mechanism. Moreover, we utilise a 3D lens antenna array having metallic plate
and a switch in our model which compensates the limitation of phase shifters. Simulation results show that
the proposed RSSD based channel estimation surpasses traditional technique and SD based channel
estimation even in lower SNR area which is highly desirable in the millimeter wave (mmWave) massive
MIMO systems.
3D METALLIC PLATE LENS ANTENNA BASED BEAMSPACE CHANNEL ESTIMATION TECHNIQUE F...ijwmn
Beamspace channel estimation mechanism for massive MIMO (multiple input multiple output) antenna
system presents a major process to compensate the 5G spectrum challenges caused by the proliferation of
information from mobile devices. However, this estimation is required to ensure the perfect channel state
information (CSI) for lower amount of Radio Frequency (RF) chains for each beam. In addition, phase
shifter (PS) components used in this estimation need high power to select the beam in the desired direction.
To overcome these limitations, in this work, we propose Regular Scanning Support Detection (RSSD)
based channel estimation mechanism. Moreover, we utilise a 3D lens antenna array having metallic plate
and a switch in our model which compensates the limitation of phase shifters. Simulation results show that
the proposed RSSD based channel estimation surpasses traditional technique and SD based channel
estimation even in lower SNR area which is highly desirable in the millimeter wave (mmWave) massive
MIMO systems.
DUAL PORT COGNITIVE RADIO ANTENNA USING TUNABLE BAND PASS FILTERjmicro
In this paper a dual port microstrip antenna with tunable band pass filter is proposed for cognitive radio applications. In single port reconfigurable antennas for cognitive radio, sensing and communication is done simultaneously. This can lead to failure of real time communication, also it may induce interference to primary user, dual antenna system solves this problem. The proposed antenna consist of one UWB microstrip antenna for sensing the holes in spectrum and other is communication antenna. Communication antenna is made tunable by using varacter diode in ‘G’ shaped DMS(defected microstrip structure) filter integrated in feedline.The sensing antenna is having UWB bandwidth from 3.4 GHz to 13.2 GHz and efficiency of more than 80%. The narrowband antenna has dual and triple operating frequencies which is tunable in the range of 4-5 GHz, 6-10 GHz and 10-11 GHz according to the biasing of varacterdiode. This antenna as efficiency more than 70%.
A low cost fractal CPW fed antenna for UWB applications with a circular radia...TELKOMNIKA JOURNAL
In this study a validated antenna into simulation and through measurement has been described and analyzed. The coplanar waveguide (CPW) technique has been chosen to feed the radiating patch while the two ground planes have been partially designed in the top side of the substrate. The fractal geometry, applied to the circular radiator, has been obtained by merging the circular and rectangular shapes. The fiberglass FR-4, with a single side of 35μm copper thickness, has been used to achieve the antenna material with a permittivity of 4.4, a thickness of 1.6 mm, a loss tangent of 0.025 and an overall dimension of 34x43 mm2. The proposed CPW fractal antenna has been configured to operate in the frequency range 3.1-10.6 GHz published by the federal communications commission (FCC) as an ultra-wide band (UWB). To calculate the return loss, the gain, the current density and the radiation pattern of the simulated antenna, two electromagnetic solvers have been involved which are the CST microwave studio and ADS. The series of measurement have been performed by using the network analyzer and the anechoic chamber in order to confirm the computed antenna.
Analysis and design of a compact ultra-wideband antenna with WLAN and X-band ...IJECEIAES
A compact design of ultra-wideband (UWB) antenna with dual band-notched characteristics are investigated in this paper. The wider impedance bandwidth (from 2.73 to 11.34 GHz) is obtained by using two symmetrical slits in the radiating patch and another slit in the partial ground plane. The dual band-notch rejection at WLAN and X-band downlink satellite communication system are obtained by inserting a modified U-strip on the radiating patch at 5.5 GHz and embedding a pair of single rectangular split ring resonators (SR-SRR) on both sides of the microstrip feed line at 7.5 GHz, respectively. The proposed antenna is simulated and tested using CST MWS high frequency simulator and exhibits the advantages of compact size, simple design and each notched frequency band can be controlled independently by using the geometrical parameters of the corresponding resonator. Therefore, the parametric study is carried out to understand the mutual coupling between the dual band-notched elements. To validate simulation results of our design, a prototype is fabricated and good agreement is achieved between measurement and simulation. Furthermore, a radiation patterns, satisfactory gain, current distribution and VSWR result at the notched frequencies make the proposed antenna a suitable candidate for practical UWB applications.
Similar to Performance of the IEEE 802.15.4a UWB System using Two Pulse Shaping Techniques in Presence of Single and Double Narrowband Interferences (20)
State of ICS and IoT Cyber Threat Landscape Report 2024 previewPrayukth K V
The IoT and OT threat landscape report has been prepared by the Threat Research Team at Sectrio using data from Sectrio, cyber threat intelligence farming facilities spread across over 85 cities around the world. In addition, Sectrio also runs AI-based advanced threat and payload engagement facilities that serve as sinks to attract and engage sophisticated threat actors, and newer malware including new variants and latent threats that are at an earlier stage of development.
The latest edition of the OT/ICS and IoT security Threat Landscape Report 2024 also covers:
State of global ICS asset and network exposure
Sectoral targets and attacks as well as the cost of ransom
Global APT activity, AI usage, actor and tactic profiles, and implications
Rise in volumes of AI-powered cyberattacks
Major cyber events in 2024
Malware and malicious payload trends
Cyberattack types and targets
Vulnerability exploit attempts on CVEs
Attacks on counties – USA
Expansion of bot farms – how, where, and why
In-depth analysis of the cyber threat landscape across North America, South America, Europe, APAC, and the Middle East
Why are attacks on smart factories rising?
Cyber risk predictions
Axis of attacks – Europe
Systemic attacks in the Middle East
Download the full report from here:
https://sectrio.com/resources/ot-threat-landscape-reports/sectrio-releases-ot-ics-and-iot-security-threat-landscape-report-2024/
Slack (or Teams) Automation for Bonterra Impact Management (fka Social Soluti...Jeffrey Haguewood
Sidekick Solutions uses Bonterra Impact Management (fka Social Solutions Apricot) and automation solutions to integrate data for business workflows.
We believe integration and automation are essential to user experience and the promise of efficient work through technology. Automation is the critical ingredient to realizing that full vision. We develop integration products and services for Bonterra Case Management software to support the deployment of automations for a variety of use cases.
This video focuses on the notifications, alerts, and approval requests using Slack for Bonterra Impact Management. The solutions covered in this webinar can also be deployed for Microsoft Teams.
Interested in deploying notification automations for Bonterra Impact Management? Contact us at sales@sidekicksolutionsllc.com to discuss next steps.
Builder.ai Founder Sachin Dev Duggal's Strategic Approach to Create an Innova...Ramesh Iyer
In today's fast-changing business world, Companies that adapt and embrace new ideas often need help to keep up with the competition. However, fostering a culture of innovation takes much work. It takes vision, leadership and willingness to take risks in the right proportion. Sachin Dev Duggal, co-founder of Builder.ai, has perfected the art of this balance, creating a company culture where creativity and growth are nurtured at each stage.
Encryption in Microsoft 365 - ExpertsLive Netherlands 2024Albert Hoitingh
In this session I delve into the encryption technology used in Microsoft 365 and Microsoft Purview. Including the concepts of Customer Key and Double Key Encryption.
Accelerate your Kubernetes clusters with Varnish CachingThijs Feryn
A presentation about the usage and availability of Varnish on Kubernetes. This talk explores the capabilities of Varnish caching and shows how to use the Varnish Helm chart to deploy it to Kubernetes.
This presentation was delivered at K8SUG Singapore. See https://feryn.eu/presentations/accelerate-your-kubernetes-clusters-with-varnish-caching-k8sug-singapore-28-2024 for more details.
DevOps and Testing slides at DASA ConnectKari Kakkonen
My and Rik Marselis slides at 30.5.2024 DASA Connect conference. We discuss about what is testing, then what is agile testing and finally what is Testing in DevOps. Finally we had lovely workshop with the participants trying to find out different ways to think about quality and testing in different parts of the DevOps infinity loop.
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf91mobiles
91mobiles recently conducted a Smart TV Buyer Insights Survey in which we asked over 3,000 respondents about the TV they own, aspects they look at on a new TV, and their TV buying preferences.
Epistemic Interaction - tuning interfaces to provide information for AI supportAlan Dix
Paper presented at SYNERGY workshop at AVI 2024, Genoa, Italy. 3rd June 2024
https://alandix.com/academic/papers/synergy2024-epistemic/
As machine learning integrates deeper into human-computer interactions, the concept of epistemic interaction emerges, aiming to refine these interactions to enhance system adaptability. This approach encourages minor, intentional adjustments in user behaviour to enrich the data available for system learning. This paper introduces epistemic interaction within the context of human-system communication, illustrating how deliberate interaction design can improve system understanding and adaptation. Through concrete examples, we demonstrate the potential of epistemic interaction to significantly advance human-computer interaction by leveraging intuitive human communication strategies to inform system design and functionality, offering a novel pathway for enriching user-system engagements.
Performance of the IEEE 802.15.4a UWB System using Two Pulse Shaping Techniques in Presence of Single and Double Narrowband Interferences
1. International Journal of Wireless & Mobile Networks (IJWMN) Vol. 5, No. 3, June 2013
DOI : 10.5121/ijwmn.2013.5303 35
Performance of the IEEE 802.15.4a UWB System
using Two Pulse Shaping Techniques in Presence
of Single and Double Narrowband Interferences
Rasha S. El-Khamy
Alexandria Higher Institute of Engineering and Technology, Alexandria, Egypt.
E-mail: rasha_sk@yahoo.com
ShawkyShaaban, Ibrahim Ghaleb, andHassan Nadir Kheirallah
Dept. of Electrical Engineering,
Faculty of Engineering, Alexandria Univ.,Alexandria 21544, Egypt.
Abstract
In Cognitive radio (CR) applications Ultra-wideband (UWB) impulse radio (IR) signals can be designed
such as they can co-exist with licensed primary users. The pulse shape should be adjusted such that the
power spectral characteristics not only meet the Federal Communications Commission (FCC) constrains,
but also mitigate multiple narrow-band interference at the locations of existing primary users. In this
paper, the Parks-McClellan (PM) Algorithm and the Eigen Value Decomposition (EVD) approach for
UWB impulse radio waveform shaping are considered. The power spectral density (PSD) and the bit-error-
rate (BER) performance of the two methods are compared in the presence of single and double narrow-
band interference (NBI). The interference rejection capabilities of the two methods are evaluated and
compared for different interference and additive noise levels. In particular, the simulations consider the
coexistence of practical IEEE 802.15.4a UWB systems with both IEEE 802.11 wireless LAN systems
operating at 5.2 GHz and radio location services operating at 8.5 GHz.
Key words; Cognitive Radio, UWB, Impulse Radio, Interference Rejection, IEEE 802.15.4a, Parks-
McClellanAlgorithm, Eigen Value Decomposition.
I. Introduction
Ultra-wideband radio is a promising technology for high data rate short-range wireless
communication. Compared with the conventional narrowband (NB) communication systems,
UWB systems have many advantages, e.g. reduced complexity, low power consumption,
immunity to multipath fading, high security, etc. [1]-[3].
Since UWB systems transfer information data by using extremely short duration pulses, they
have considerably large bandwidth. FCC regulates UWB systems can exploit the frequencies
from 3.1 GHz to 10.6 GHz [4]. From Shannon channel capacity [5], it is evident that UWB
systems can achieve higher capacity than any other current wireless communication systems.
However, in order to reduce the interference between UWB systems and the existing NB systems,
FCC presents a UWB spectral mask to restrict the power spectrum of UWB systems.
2. International Journal of Wireless & Mobile Networks (IJWMN) Vol. 5, No. 3, June 2013
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The spectrum of a transmitted signal is influenced by the modulation format, the multiple
access schemes, and most critically by the spectral shape of the underlying UWB pulse. The
choice of the pulse shape is thus a key design decision in UWB systems.
Several pulse design methods of UWB signals have been proposed to let them match with the
FCC spectral mask. The simple Gaussian monocycle pulses need to be filtered to meet the FCC
spectral mask. This leads that the time duration of the corresponding pulses becomes too long. On
the other hand, Gaussian derivatives pulses [6] have fixed features, i.e.; their spectrums are
unchangeable once they have been built, making them unable to adjust and adapt their frequency
components to avoid frequency colliding. Prolate spherical wave functions [7] and modified
Hermite orthogonal polynomials [8] are also used to generate mutually orthogonal pulses that can
be used in multiple access schemes. These pulses fit frequency masks with multiple pass-bands.
However, they require a high sampling rate that could lead to implementation difficulties.
In this paper, two pulse design methods are discussed and compared as methods of NBI
suppression and at the same time overcoming the short-comes of the previously mentioned pulses
shapes. The methods give a chance of increasing the UWB transmitted power and enlarging the
application range of UWB systems, while meeting the FCC spectral mask. The considered pulse
design methods are the Parks-McClellan (PM) Algorithm [9,10], the Eigen Value Decomposition
(EVD) approach [11,12].
The paper is organized as follows. Section II presents a filter design method using the PM
filter design algorithm. Simulation results of the pulse design for single and double narrowband
interference are illustrated. Section III presents the EVD approach for pulse design and shows by
simulation how it mitigates multiple NBI. Section IV gives a comparison between the PSD of the
EVD approach and the PM pulse design method. Simulations will be done for both single and
double NBI. Section V evaluates and compares the bit error rate (BER) performance of both
systems in case of single and NBI. Section VI draws the conclusion.
II. Pulse Design Method using the Parks-McClellan (PM) Filter Design
Algorithm
A. The PM Algorithm
In this approach the UWB pulses are designed using an adaptive filter design method based
on the PM Algorithm. CR Technology[13]is used to suppress the narrowband interference, as
well as satisfying the FCC indoor spectral mask.
The PM Algorithm[9,10] was published by James McClellan and Thomas Parks in 1972 as an
iterative algorithm for finding the optimal Chebyshevfinite impulse response (FIR) filter. The PM
Algorithm is utilized to design and implement efficient and optimal FIR filters. It uses an indirect
method for finding the optimal filter coefficients. The goal of the algorithm is to minimize the
error in the pass and stop bands by utilizing the Chebyshev approximation. The PM Algorithm is
a variation of the Remez Algorithm[9], with the change that it is specifically designed for FIR
filters and has become a standard method for FIR filter design.
The use of PM method to design UWB pulses with single or double notches at the narrow
band interference frequency was considered in [14]. The spectrum of the adaptive pulse, ( ), can
be expressed as:
( ) = ( ) − ( ) (1)
3. International Journal of Wireless & Mobile Networks (IJWMN) Vol. 5, No. 3, June 2013
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Where ( ) and ( ) are the spectra of the UWB needed to satisfy the FCC mask and the
narrowband interference spectrum to be cancelled. The estimated optimal pulse spectrum, ( )
can be expressed as a polynomial of order R:
( ) = ∑ (2)
The observational error is defined as:
( ) = ( )[ ( ) − ( )] (3)
where, ( ), is a suitable weighting function. The remez(..) function in MATLAB can then be
used to get the solution that minimizes the error.
B. Simulation Results of Pulse Design:
iSingle Narrowband Interference:The adaptive pulse, the normalized spectrum and the resultant
designed spectrum are shown in Fig. 1. It was generated by setting the remez(N,F,M,W) function
with N=90 sample points. The frequency vector F, its corresponding amplitude value M, and the
weight vector W are as follows:
F1=[0,0.21,0.2583,0.39,0.432,0.46, 0.48,0.73,0.76,1];
M1= [0,0,1,1,0,1,1,1,0.316,0.316]; W1=[6,1,6,1,3].
The NB interference is assumed at 5.2 GHz. It is clear from Fig. 1 that the spectrum fit
the normalized FCC mask while the narrowband interference at 5.2 GHz is suppressed.
ii. Double Narrow-band Interference:Now we assume two NBI signals interfering with the
UWB band centered at frequencies 5.2 and 8.5 GHz. Using the same pre-described remez
function, the generated pulse in this case and its PSD are obtained as shown in Fig. 2.
III. Eigen-Value Decomposition (EVD) Approach
Another pulse design method based on Eigen-value decomposition [11,12]is considered in
this paper as another method to suppress single or multiple narrow-band interferences located in
the UWB band.
(a)
International Journal of Wireless & Mobile Networks (IJWMN) Vol. 5, No. 3, June 2013
37
Where ( ) and ( ) are the spectra of the UWB needed to satisfy the FCC mask and the
narrowband interference spectrum to be cancelled. The estimated optimal pulse spectrum, ( )
can be expressed as a polynomial of order R:
( ) = ∑ (2)
The observational error is defined as:
( ) = ( )[ ( ) − ( )] (3)
where, ( ), is a suitable weighting function. The remez(..) function in MATLAB can then be
used to get the solution that minimizes the error.
B. Simulation Results of Pulse Design:
iSingle Narrowband Interference:The adaptive pulse, the normalized spectrum and the resultant
designed spectrum are shown in Fig. 1. It was generated by setting the remez(N,F,M,W) function
with N=90 sample points. The frequency vector F, its corresponding amplitude value M, and the
weight vector W are as follows:
F1=[0,0.21,0.2583,0.39,0.432,0.46, 0.48,0.73,0.76,1];
M1= [0,0,1,1,0,1,1,1,0.316,0.316]; W1=[6,1,6,1,3].
The NB interference is assumed at 5.2 GHz. It is clear from Fig. 1 that the spectrum fit
the normalized FCC mask while the narrowband interference at 5.2 GHz is suppressed.
ii. Double Narrow-band Interference:Now we assume two NBI signals interfering with the
UWB band centered at frequencies 5.2 and 8.5 GHz. Using the same pre-described remez
function, the generated pulse in this case and its PSD are obtained as shown in Fig. 2.
III. Eigen-Value Decomposition (EVD) Approach
Another pulse design method based on Eigen-value decomposition [11,12]is considered in
this paper as another method to suppress single or multiple narrow-band interferences located in
the UWB band.
(a)
International Journal of Wireless & Mobile Networks (IJWMN) Vol. 5, No. 3, June 2013
37
Where ( ) and ( ) are the spectra of the UWB needed to satisfy the FCC mask and the
narrowband interference spectrum to be cancelled. The estimated optimal pulse spectrum, ( )
can be expressed as a polynomial of order R:
( ) = ∑ (2)
The observational error is defined as:
( ) = ( )[ ( ) − ( )] (3)
where, ( ), is a suitable weighting function. The remez(..) function in MATLAB can then be
used to get the solution that minimizes the error.
B. Simulation Results of Pulse Design:
iSingle Narrowband Interference:The adaptive pulse, the normalized spectrum and the resultant
designed spectrum are shown in Fig. 1. It was generated by setting the remez(N,F,M,W) function
with N=90 sample points. The frequency vector F, its corresponding amplitude value M, and the
weight vector W are as follows:
F1=[0,0.21,0.2583,0.39,0.432,0.46, 0.48,0.73,0.76,1];
M1= [0,0,1,1,0,1,1,1,0.316,0.316]; W1=[6,1,6,1,3].
The NB interference is assumed at 5.2 GHz. It is clear from Fig. 1 that the spectrum fit
the normalized FCC mask while the narrowband interference at 5.2 GHz is suppressed.
ii. Double Narrow-band Interference:Now we assume two NBI signals interfering with the
UWB band centered at frequencies 5.2 and 8.5 GHz. Using the same pre-described remez
function, the generated pulse in this case and its PSD are obtained as shown in Fig. 2.
III. Eigen-Value Decomposition (EVD) Approach
Another pulse design method based on Eigen-value decomposition [11,12]is considered in
this paper as another method to suppress single or multiple narrow-band interferences located in
the UWB band.
(a)
4. International Journal of Wireless & Mobile Networks (IJWMN) Vol. 5, No. 3, June 2013
38
(b)
Fig. 1. Adaptive Generated Pulse for Single NBI Rejection using the PM Algorithm
a) Pulse shape b) Normalized PSD of generated pulse.
(a)
(b)
Fig. 2Adaptive Generated Pulse for Multiple NBI Rejection using the PM Algorithm:
a) Normalized Pulse shape b) PSD of generated pulse
The time response s(t) of the ideal pulse covering the frequency ban , where: fL=3.1GHz,
fH=10.6GHz is obtained by the inverse Fourier transform of the FCC ideal mask H(f) as,
( ) = 2 sinc(2 ) − 2 sinc(2 ) (4)
where, sinc(x)=sin( x)/ x. The UWB pulses s(t) can thus be generated by convolution:
( ) = ∫ (
∞
∞
) ( − )d (5)
where, λ is a constant (Eigen value). By sampling at a rate of N samples per pulse period Tm, ,
equation (5) can be expressed as an Eigen Value Problem, namely,
. = . (6)
0 2 4 6 8 10 12
-120
-100
-80
-60
-40
-20
0
20
Frequency(GHz)
DesignedSpectrum(dB)
International Journal of Wireless & Mobile Networks (IJWMN) Vol. 5, No. 3, June 2013
38
(b)
Fig. 1. Adaptive Generated Pulse for Single NBI Rejection using the PM Algorithm
a) Pulse shape b) Normalized PSD of generated pulse.
(a)
(b)
Fig. 2Adaptive Generated Pulse for Multiple NBI Rejection using the PM Algorithm:
a) Normalized Pulse shape b) PSD of generated pulse
The time response s(t) of the ideal pulse covering the frequency ban , where: fL=3.1GHz,
fH=10.6GHz is obtained by the inverse Fourier transform of the FCC ideal mask H(f) as,
( ) = 2 sinc(2 ) − 2 sinc(2 ) (4)
where, sinc(x)=sin( x)/ x. The UWB pulses s(t) can thus be generated by convolution:
( ) = ∫ (
∞
∞
) ( − )d (5)
where, λ is a constant (Eigen value). By sampling at a rate of N samples per pulse period Tm, ,
equation (5) can be expressed as an Eigen Value Problem, namely,
. = . (6)
0 2 4 6 8 10 12
-120
-100
-80
-60
-40
-20
0
20
Frequency(GHz)
DesignedSpectrum(dB)
International Journal of Wireless & Mobile Networks (IJWMN) Vol. 5, No. 3, June 2013
38
(b)
Fig. 1. Adaptive Generated Pulse for Single NBI Rejection using the PM Algorithm
a) Pulse shape b) Normalized PSD of generated pulse.
(a)
(b)
Fig. 2Adaptive Generated Pulse for Multiple NBI Rejection using the PM Algorithm:
a) Normalized Pulse shape b) PSD of generated pulse
The time response s(t) of the ideal pulse covering the frequency ban , where: fL=3.1GHz,
fH=10.6GHz is obtained by the inverse Fourier transform of the FCC ideal mask H(f) as,
( ) = 2 sinc(2 ) − 2 sinc(2 ) (4)
where, sinc(x)=sin( x)/ x. The UWB pulses s(t) can thus be generated by convolution:
( ) = ∫ (
∞
∞
) ( − )d (5)
where, λ is a constant (Eigen value). By sampling at a rate of N samples per pulse period Tm, ,
equation (5) can be expressed as an Eigen Value Problem, namely,
. = . (6)
5. International Journal of Wireless & Mobile Networks (IJWMN) Vol. 5, No. 3, June 2013
39
where, the vector s represents the samples of discretized UWB pulse, H is a Hermitian matrix
constructed by the discrete samples of h(t).
Fig. 3. PSD of the Eigen pulse in absence of an Interferer, and compared to that of the Designed Single and
Double Notch Eigen Pulse
The extension of the designed Eigen pulses to affect nulls at the frequencies of narrowband
interference was discussed in [15]. Comparison between the obtained spectra of the ideal pulse,
the pulse needed to mitigate single narrowband interference of the IEEE 802.11 wireless LAN
systems operating at 5.2 GHzand the pulse needed to mitigate double narrow band interferences
of the radio location services operating at 8.5 GHz are shown in Fig. 3 [15].
IV. PSD Comparison between (EVD) Method and (PM) Filter Design
Algorithm
A- Single Narrowband Interference:
The PSD of Single Notch Modified Eigen Pulse is compared to the PSD of a Single Notch
adaptive PM Pulse in Fig. 4. The NB interference is assumed at 5.2 GHz.
The used design parameters for the generation of the Single Notch Eigen Pulse are: sampling
frequency fs=120 GHz, fL=3.1GHz, fM=4.9GHz, fN=4 GHz, and fH=11.1 GHz.
The PSD of adaptive PM pulse is generated as seen in Fig. 4 by setting the remez (N,F,M,W)
function with N=90 sample points, sampling frequency of 30 GHz, frequency vector F, its
corresponding amplitude value M, and the weight vector W are as follows:
F1= [ 0 0.168 0.20664 0.33 0.35 0.37 0.384 0.68667 0.70667 1] ;
M=[ 0 0 1 1 0 1 1 1 0 0]
B- Double Narrowband Interference:
The PSD of Double Notch Eigen Pulse iscompared to the PSD of a Double Notch adaptive PM
Pulse as shown in Fig. 5. The NB interference is assumed at 5.2 GHz and 8.5 GHz.
The used design parameters for the generation of the Double Notch Eigen Pulse are: fs=120GHz,
fL1=3.1GHz, fH1=4.9GHz, fL2=4GHz, fH2=11.1 GHz, fL3= 7.9 GHz, fH3=10.7 GHz.
6. International Journal of Wireless & Mobile Networks (IJWMN) Vol. 5, No. 3, June 2013
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The PSD of adaptive PM pulse is generated as seen in Fig.5 by setting the remez (N,F,M,W)
function with N=90 sample points, sampling frequency of 30 GHz, frequency vector F, its
corresponding amplitude value M, and the weight vector W are as follows:
F1= [ 0 0.168 0.20664 0.33 0.35 0.368 0.384 0.55 0.56667
0.59 0.6 0.68667 0.70667 ]
M = [ 0 0 1 1 0 1 1 1 0 0 ]
Fig. 4.PSD of Single Notch Adaptive PM Pulse, and compared to PSD of Single Notch EigenPulse
Fig. 5.PSD of Double Notch Adaptive PM Pulse, and compared to PSD of Double Notch Eigen Pulse
- V.Bit Error Rate (BER) Performance Comparison between(EVD)
Method and (PM) Filter Design Algorithm
The BER performance of the IEEE 802.15.4a UWB system transmitting on IEEE
802.15.4a channel is evaluated. The IEEE 802.15.4a UWB channel model is deployed[16].The
IEEE 802.15.4a UWB channel model is deployed. The UWB channel model is a Saleh-
Valenzuela (SV) model modified to take into account different measurement and simulation
parameters [23]. Our simulations in this paper assume the residential LOS model CM1, with
parameters as given in Table I of [23].
The IEEE 802.15.4a transmitter is specified by the standard and is explained in details in [16-
23]. The receiver deployed is a coherent detector assuming perfect UWB channel estimation
available at the receiver [21].
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A- Single Narrowband Interference:
We consider the coexistence of practical IEEE 802.15.4a UWB systems with IEEE 802.11
wireless LAN systems operating at 5.2 GHz.
In Fig. 6, BER performance is evaluated for each of the ideal Eigen Pulse (in absence of
interference), Single Notch Eigen Pulse and the Single Notch adaptive PM Pulse. The BER
performance is compared versus the SIR, and at Signal to Noise Ratio (SNR) fixed at Eb/N0 of 9
dB.It is clear from the figure that the Single Notch adaptive PM Pulse outperforms the Eigen-
Value pulse whether there is a single- notch interference or in its absence.
In Fig. 7, BER performance evaluation is repeated. This time, the BER performance is
simulated versus the SNR and at Signal to Interference Ratio (SIR) fixed at 5 dB. The same
results appear here also; i.e: the BER of the Single Notch adaptive PM Pulse is the least among
the three methods at any SNR value
.
Fig.6.BER vs SIR at Eb/N0 of 9 dB in the presense of a single narrow band interference
B- Double Narrowband Interference:
Here, the coexistence of practical IEEE 802.15.4a UWB systems is considered with both
IEEE 802.11 wireless LAN systems operating at 5.2 GHz and radio location services operating at
8.5 GHz.
Simulations are repeated in Fig. 8 but comparisons are extended to include Double NBI at 8.5
GHz. BER performance is evaluated for each of the ideal Eigen Pulse (in absence of
interference), Double Notch Eigen Pulse and the Double Notch adaptive PM Pulse. The BER
performance is compared versus the SIR. The Signal to Noise Ratio (SNR) is fixed at Eb/N0 of
3dB. Results show that the Double Notch Eigen Pulse outperforms the Double Notch adaptive
PM Pulse at any SIR value.
In Fig. 9, BER performance evaluation is repeated. This time, the BER performance is simulated
versus the SNR. Signal to Interference Ratio (SIR) is fixed at 5 dB . Results show that the
performance of Double Notch Eigen Pulse is nearly the same as that of Double Notch adaptive
International Journal of Wireless & Mobile Networks (IJWMN) Vol. 5, No. 3, June 2013
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A- Single Narrowband Interference:
We consider the coexistence of practical IEEE 802.15.4a UWB systems with IEEE 802.11
wireless LAN systems operating at 5.2 GHz.
In Fig. 6, BER performance is evaluated for each of the ideal Eigen Pulse (in absence of
interference), Single Notch Eigen Pulse and the Single Notch adaptive PM Pulse. The BER
performance is compared versus the SIR, and at Signal to Noise Ratio (SNR) fixed at Eb/N0 of 9
dB.It is clear from the figure that the Single Notch adaptive PM Pulse outperforms the Eigen-
Value pulse whether there is a single- notch interference or in its absence.
In Fig. 7, BER performance evaluation is repeated. This time, the BER performance is
simulated versus the SNR and at Signal to Interference Ratio (SIR) fixed at 5 dB. The same
results appear here also; i.e: the BER of the Single Notch adaptive PM Pulse is the least among
the three methods at any SNR value
.
Fig.6.BER vs SIR at Eb/N0 of 9 dB in the presense of a single narrow band interference
B- Double Narrowband Interference:
Here, the coexistence of practical IEEE 802.15.4a UWB systems is considered with both
IEEE 802.11 wireless LAN systems operating at 5.2 GHz and radio location services operating at
8.5 GHz.
Simulations are repeated in Fig. 8 but comparisons are extended to include Double NBI at 8.5
GHz. BER performance is evaluated for each of the ideal Eigen Pulse (in absence of
interference), Double Notch Eigen Pulse and the Double Notch adaptive PM Pulse. The BER
performance is compared versus the SIR. The Signal to Noise Ratio (SNR) is fixed at Eb/N0 of
3dB. Results show that the Double Notch Eigen Pulse outperforms the Double Notch adaptive
PM Pulse at any SIR value.
In Fig. 9, BER performance evaluation is repeated. This time, the BER performance is simulated
versus the SNR. Signal to Interference Ratio (SIR) is fixed at 5 dB . Results show that the
performance of Double Notch Eigen Pulse is nearly the same as that of Double Notch adaptive
International Journal of Wireless & Mobile Networks (IJWMN) Vol. 5, No. 3, June 2013
41
A- Single Narrowband Interference:
We consider the coexistence of practical IEEE 802.15.4a UWB systems with IEEE 802.11
wireless LAN systems operating at 5.2 GHz.
In Fig. 6, BER performance is evaluated for each of the ideal Eigen Pulse (in absence of
interference), Single Notch Eigen Pulse and the Single Notch adaptive PM Pulse. The BER
performance is compared versus the SIR, and at Signal to Noise Ratio (SNR) fixed at Eb/N0 of 9
dB.It is clear from the figure that the Single Notch adaptive PM Pulse outperforms the Eigen-
Value pulse whether there is a single- notch interference or in its absence.
In Fig. 7, BER performance evaluation is repeated. This time, the BER performance is
simulated versus the SNR and at Signal to Interference Ratio (SIR) fixed at 5 dB. The same
results appear here also; i.e: the BER of the Single Notch adaptive PM Pulse is the least among
the three methods at any SNR value
.
Fig.6.BER vs SIR at Eb/N0 of 9 dB in the presense of a single narrow band interference
B- Double Narrowband Interference:
Here, the coexistence of practical IEEE 802.15.4a UWB systems is considered with both
IEEE 802.11 wireless LAN systems operating at 5.2 GHz and radio location services operating at
8.5 GHz.
Simulations are repeated in Fig. 8 but comparisons are extended to include Double NBI at 8.5
GHz. BER performance is evaluated for each of the ideal Eigen Pulse (in absence of
interference), Double Notch Eigen Pulse and the Double Notch adaptive PM Pulse. The BER
performance is compared versus the SIR. The Signal to Noise Ratio (SNR) is fixed at Eb/N0 of
3dB. Results show that the Double Notch Eigen Pulse outperforms the Double Notch adaptive
PM Pulse at any SIR value.
In Fig. 9, BER performance evaluation is repeated. This time, the BER performance is simulated
versus the SNR. Signal to Interference Ratio (SIR) is fixed at 5 dB . Results show that the
performance of Double Notch Eigen Pulse is nearly the same as that of Double Notch adaptive
8. International Journal of Wireless & Mobile Networks (IJWMN) Vol. 5, No. 3, June 2013
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PM Pulse; BER is nearly the same at any SNR value. However, if the SNR is deeply lowered to -
20 dB, results show that the Double Notch Eigen Pulse gives the better performance.
Fig.7. BER vs SNR at fixed SIR of 5 dB
VI. Conclusion
In this paper two methods are presented to suppress NBI located in the UWB band without the
need of lowering the UWB pulse PSD. These methods not only give a solution to the co-
existence between UWB systems and existing narrowband systems, but also give a chance of
increasing the UWB transmitted power and enlarging the application range of UWB systems,
while meeting the FCC spectral mask. The PSD and BER comparisons between both the EVD
approach and the PM pulse design algorithm for single and double NBI are evaluated. Results
showed that for single NBI, the PM algorithm outperforms the EVD method. While in the case
of double NBI, the performance of both methods are nearly the same, except at very low values;
SNR= -20dB, performance of the PM algorithm degrades alot.
Fig.8.BER vs SIR at atEb/N0 of 3 dB
International Journal of Wireless & Mobile Networks (IJWMN) Vol. 5, No. 3, June 2013
42
PM Pulse; BER is nearly the same at any SNR value. However, if the SNR is deeply lowered to -
20 dB, results show that the Double Notch Eigen Pulse gives the better performance.
Fig.7. BER vs SNR at fixed SIR of 5 dB
VI. Conclusion
In this paper two methods are presented to suppress NBI located in the UWB band without the
need of lowering the UWB pulse PSD. These methods not only give a solution to the co-
existence between UWB systems and existing narrowband systems, but also give a chance of
increasing the UWB transmitted power and enlarging the application range of UWB systems,
while meeting the FCC spectral mask. The PSD and BER comparisons between both the EVD
approach and the PM pulse design algorithm for single and double NBI are evaluated. Results
showed that for single NBI, the PM algorithm outperforms the EVD method. While in the case
of double NBI, the performance of both methods are nearly the same, except at very low values;
SNR= -20dB, performance of the PM algorithm degrades alot.
Fig.8.BER vs SIR at atEb/N0 of 3 dB
International Journal of Wireless & Mobile Networks (IJWMN) Vol. 5, No. 3, June 2013
42
PM Pulse; BER is nearly the same at any SNR value. However, if the SNR is deeply lowered to -
20 dB, results show that the Double Notch Eigen Pulse gives the better performance.
Fig.7. BER vs SNR at fixed SIR of 5 dB
VI. Conclusion
In this paper two methods are presented to suppress NBI located in the UWB band without the
need of lowering the UWB pulse PSD. These methods not only give a solution to the co-
existence between UWB systems and existing narrowband systems, but also give a chance of
increasing the UWB transmitted power and enlarging the application range of UWB systems,
while meeting the FCC spectral mask. The PSD and BER comparisons between both the EVD
approach and the PM pulse design algorithm for single and double NBI are evaluated. Results
showed that for single NBI, the PM algorithm outperforms the EVD method. While in the case
of double NBI, the performance of both methods are nearly the same, except at very low values;
SNR= -20dB, performance of the PM algorithm degrades alot.
Fig.8.BER vs SIR at atEb/N0 of 3 dB
9. International Journal of Wireless & Mobile Networks (IJWMN) Vol. 5, No. 3, June 2013
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Fig.9.BER vs SNR at fixed SIR of 5 dB
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