10-Gb/S Transmission of Wdm Pon for Man with 50km Reach Based On FtthIJERA Editor
The wavelength-division-multiplexed passive optical network (WDM-PON) is considered to be the next evolutionary solution for a simplified and future-proofed access system that can accommodate exponential traffic growth and bandwidth-hungry new applications. WDM-PON mitigates the complicated time-sharing and power budget issues in time division- multiplexed PON (TDM-PON) by providing virtual point-to-point optical connectivity to multiple end users through a dedicated pair of wavelengths. The objective of this paper is proposed a scheme for metropolitan area networks comprising optical components based on arrayed waveguide grating multiplexers, demultiplexers .The Arrayed waveguide gratings based multiplexers and demultiplexers for WDM applications prove to be capable of precise multiplexing and demultiplexing of a large number of channels with relatively low losses.
IEEE 2014 NS2 NETWORKING PROJECTS Optical networking with variable code-rate...IEEEBEBTECHSTUDENTPROJECTS
To Get any Project for CSE, IT ECE, EEE Contact Me @ 09666155510, 09849539085 or mail us - ieeefinalsemprojects@gmail.com-Visit Our Website: www.finalyearprojects.org
MIMO-OFDM (Multi Input Multi Output- Orthogonal Frequency Division Multiplexing) system is very popular technique for mobile communication. We found that Ergodic channel capacity has some limitation in MIMO-OFDM system. So Ergodic channel capacity optimization is necessary to improve the performance of MIMO-OFDM System.
This document contains information about various MTech projects related to communications, image processing, signal processing, and wireless networks. It lists over 50 project titles in these fields and provides contact information for Muthu Technologies, which offers MATLAB simulation projects on these topics for MTech students.
100 g dwdm qsfp28 the enabler of 100g end-toend long distance connectivity-co...CBO Connecting Technology
The BlueOptics and BlueLAN brands include the following products: Optical Transceivers, Active Optical Cable and Direct Attach Twinax Cable Solutions, MPO / MTP Solutions, SAS Solutions, Stacking Cables, Fiber Optic Patch Cords, PLC Splitters, Multiplexers, Demultiplexers, as well as other data center and cloud solutions.
For more info, please visit at https://www.cbo-it.de
Impulse Radio Ultra WideBand (IR-UWB) commu- nication has proven to be an important
technique for supporting high-rate, short-range, and low-power communication. In this paper, using
detailed models of typical IR-UWB transmitter and receiver structures, we model the energy
consumption per information bit in a single linkof an IR-UWB system, considering packet overhead,
retransmissions, and a Nakagami-m fading channel. Using this model, we minimize the energy
consumption per information bit by finding the optimum packet length and the optimum number of
RAKE fingers at the receiver for different transmission distances, using Differential Phase-shift keying
(DBPSK), Differential Pulse-position Modulation (DPPM) and On-off Keying (OOK), with coherent
and non-coherent detection. The increasing demand for wireless communication introduces efficient
spectrum utilization challenge. To address this challenge, cognitive radio (CR) is emerged as the key
technology; which enables opportunistic access to the spectrum. CR is a form of wireless
communication in which a transceiver can intelligently detect which communication channels are in
use and which are not, and instantly move into vacant channels while avoiding occupied ones..
100 g Dwdm Qsfp28 the Enabler of 100g End-Toend Llong Distance ConnectivityCBO Connecting Technology
A QSFP28 is a combination of transmitter and receiver for the transfer of optical signals. The QSFP28 uses an electronic to optical converter to translate the signals within the QSFP28 . For the transmission, the QSFP28 uses LEDs or lasers.
https://www.cbo-it.de/shop/QSFP28-Transceivers
10-Gb/S Transmission of Wdm Pon for Man with 50km Reach Based On FtthIJERA Editor
The wavelength-division-multiplexed passive optical network (WDM-PON) is considered to be the next evolutionary solution for a simplified and future-proofed access system that can accommodate exponential traffic growth and bandwidth-hungry new applications. WDM-PON mitigates the complicated time-sharing and power budget issues in time division- multiplexed PON (TDM-PON) by providing virtual point-to-point optical connectivity to multiple end users through a dedicated pair of wavelengths. The objective of this paper is proposed a scheme for metropolitan area networks comprising optical components based on arrayed waveguide grating multiplexers, demultiplexers .The Arrayed waveguide gratings based multiplexers and demultiplexers for WDM applications prove to be capable of precise multiplexing and demultiplexing of a large number of channels with relatively low losses.
IEEE 2014 NS2 NETWORKING PROJECTS Optical networking with variable code-rate...IEEEBEBTECHSTUDENTPROJECTS
To Get any Project for CSE, IT ECE, EEE Contact Me @ 09666155510, 09849539085 or mail us - ieeefinalsemprojects@gmail.com-Visit Our Website: www.finalyearprojects.org
MIMO-OFDM (Multi Input Multi Output- Orthogonal Frequency Division Multiplexing) system is very popular technique for mobile communication. We found that Ergodic channel capacity has some limitation in MIMO-OFDM system. So Ergodic channel capacity optimization is necessary to improve the performance of MIMO-OFDM System.
This document contains information about various MTech projects related to communications, image processing, signal processing, and wireless networks. It lists over 50 project titles in these fields and provides contact information for Muthu Technologies, which offers MATLAB simulation projects on these topics for MTech students.
100 g dwdm qsfp28 the enabler of 100g end-toend long distance connectivity-co...CBO Connecting Technology
The BlueOptics and BlueLAN brands include the following products: Optical Transceivers, Active Optical Cable and Direct Attach Twinax Cable Solutions, MPO / MTP Solutions, SAS Solutions, Stacking Cables, Fiber Optic Patch Cords, PLC Splitters, Multiplexers, Demultiplexers, as well as other data center and cloud solutions.
For more info, please visit at https://www.cbo-it.de
Impulse Radio Ultra WideBand (IR-UWB) commu- nication has proven to be an important
technique for supporting high-rate, short-range, and low-power communication. In this paper, using
detailed models of typical IR-UWB transmitter and receiver structures, we model the energy
consumption per information bit in a single linkof an IR-UWB system, considering packet overhead,
retransmissions, and a Nakagami-m fading channel. Using this model, we minimize the energy
consumption per information bit by finding the optimum packet length and the optimum number of
RAKE fingers at the receiver for different transmission distances, using Differential Phase-shift keying
(DBPSK), Differential Pulse-position Modulation (DPPM) and On-off Keying (OOK), with coherent
and non-coherent detection. The increasing demand for wireless communication introduces efficient
spectrum utilization challenge. To address this challenge, cognitive radio (CR) is emerged as the key
technology; which enables opportunistic access to the spectrum. CR is a form of wireless
communication in which a transceiver can intelligently detect which communication channels are in
use and which are not, and instantly move into vacant channels while avoiding occupied ones..
100 g Dwdm Qsfp28 the Enabler of 100g End-Toend Llong Distance ConnectivityCBO Connecting Technology
A QSFP28 is a combination of transmitter and receiver for the transfer of optical signals. The QSFP28 uses an electronic to optical converter to translate the signals within the QSFP28 . For the transmission, the QSFP28 uses LEDs or lasers.
https://www.cbo-it.de/shop/QSFP28-Transceivers
This document describes a real-time MIMO-LTE test-bed developed by Telefónica I+D to test LTE technology. The test-bed includes a radio frontend module, communications and control module, and system processing module. It allows for demonstration of basic LTE operations and analysis of resource distribution and latency. Future work will focus on implementing advanced LTE technologies on a new hardware platform.
NetSim Webinar on Cognitive Radio NetworksSANJAY ANAND
Why use a Network Simulator for research ?
Introduction to NetSim
Cognitive Radio Basics
Designing Cognitive Radio networks using NetSim
Modifying Cognitive Radio source C code in NetSim
How to develop custom metrics?
Q & A
The document discusses various literature on OFDM and MC-CDMA techniques. It summarizes 17 research papers on topics like using wavelet packets instead of Fourier transform in MC-CDMA to improve bandwidth efficiency and reduce interference. It also discusses using techniques like DWT, Radon transform, and antenna diversity with MC-CDMA and comparing the BER performance of different approaches in various channel conditions like AWGN, Rayleigh fading and frequency selective fading channels. The rationale given is that replacing Fourier transform with wavelet packets in MC-CDMA can eliminate the need for cyclic prefix and improve spectral efficiency.
The document surveys 17 literature sources on multi-carrier modulation techniques like OFDM and MC-CDMA. Several sources propose using wavelet transforms instead of Fourier transforms to improve bandwidth efficiency and reduce interference for MC-CDMA systems. Simulation results from the literature show that wavelet packet based MC-CDMA can outperform FFT based MC-CDMA in terms of lower bit error rates, especially in frequency selective fading channels. The rationale given is that wavelet transforms eliminate the need for cyclic prefixes, thereby improving spectral efficiency over traditional MC-CDMA schemes.
MIMO Systems for Military Communication/Applications.IJERA Editor
The Military is embracing the communication revolution, turning to a new generation of sophisticated systems
to enable faster, richer, less costly, more flexible, reliable, compact, mobile, jam resistant, low probability of
detection, re configurable and spectrally efficient communication. Many of these features can be added to a
great extent in the existing systems, by utilising MIMO technology appropriately and judiciously. MIMO finds
applications in wireless communication, NLOS communication, satellite communication, HF communication,
Optical Fibre Communication. MIMO makes these technologies more suitable by introducing features
mandatory for military communication such as Ant jamming capability, Low Probability of Intercept, low
visibility of satellite earth Antennas by reducing their aperture area. MIMO can also provide redundancy by
employing no extra resources, thereby increasing reliability. MIMO is highly effective to communicate with
Unmanned Aerial Vehicles (1).
This document summarizes a research project comparing wavelet packet based MC-CDMA with conventional MC-CDMA using the Hilbert-Huang transform tool. The research aims to show that wavelet packet based MC-CDMA has better bit error rate performance than conventional MC-CDMA in dealing with channel fading and interference. It provides background on MC-CDMA and wavelet packet techniques. It outlines the methodology which involves simulation using MATLAB and the Hilbert-Huang transform tool for spectral analysis. The expected outcome is that wavelet packet MC-CDMA will demonstrate comparative superiority over conventional MC-CDMA.
Improvement of crankshaft MAC protocol for wireless sensor networks: a simula...IJECEIAES
Due to the dramatic growth in the use of Wireless Sensor Network (WSN) applications ranging from environment and habitat monitoring to tracking and surveillance, network research in WSN protocols has been very active in the last decade. With battery-powered sensors operating in unattended environments, energy conservation becomes the key technique for improving WSN lifetimes. WSN Medium Access Control (MAC) protocols address energy awareness and reduced duty cycles. The focus of this study is to investigate, through simulation, the effect of variations in various factors that influence the performance results of WSNs. Using MiXiM framework with OMNeT++ simulator, this simulation study proposes modifications in Crankshaft MAC protocol in order to improve its performance. The impact of duration and number of slots, degree of connectivity among the nodes, mobility speed and mobility update interval and also, the impact of sending data packets without preambles are investigated. Based on the simulation results, an improved version of the Crankshaft protocol for WSN is suggested and a comparative study of the performances of the original and improved protocol is presented. The results clearly indicate the superiority of the improved protocol over its original version.
This thesis examines channel estimation techniques for 3GPP LTE downlink. It introduces LTE physical layer specifications including frame structure and reference signals. It describes propagation models and channel models specified for LTE. It then focuses on pilot-assisted channel estimation methods for single-input single-output systems, including least squares and minimum mean square error estimation. Performance is evaluated using bit error rate and symbol error rate. Space-frequency block coding for multiple antenna systems is also discussed along with corresponding channel estimation and decoding.
This document proposes iterative clipping and error filtering methods to improve the performance of UFMC systems using SLM for 5G networks. Existing SLM techniques have high complexity and reduce spectral efficiency. The proposed method uses phase offset SLM in a UFMC system without needing to transmit side information, increasing data rate. It provides advantages over OFDM like low latency, high spectral efficiency, and lower out-of-band emissions. The performance of the proposed UFMC-SLM system will be evaluated using MATLAB simulations.
The document discusses the IEEE 802.22 standard for cognitive radio wireless regional area networks (WRANs). It describes how cognitive radio technology can help address the spectrum crunch by efficiently utilizing vacant TV bands and other licensed spectrum. The standard defines the MAC and PHY layer specifications for a cognitive radio system, including spectrum sensing, mobility, sharing, and a superframe structure to manage communication in available TV channels while avoiding interference with primary users. The goal is to provide wireless connectivity over distances of up to 30 km using the cognitive radio capabilities defined in the 802.22 standard.
In this presentation the effect of channel estimation errors on the energy efficiency of a down-link massive multiple-input multiple-output system is investigated and analyzed. The required down-link transmit power of the zero forcing (ZF) and maximum ratio transmission (MRT) precoding schemes are derived and analyzed under imperfect channel state information condition.
The document summarizes Deutsche Telekom's requirements and candidate technologies for 3GPP Release 12 and beyond. It discusses the need for significant capacity increases to meet growing mobile broadband demand through technologies like small cells, antenna arrays, and MIMO enhancements. It also addresses spectrum needs, improved inter-RAT functionality between LTE and UMTS, support for new services like proximity and M2M, and further HSPA enhancements. The presentation was given at a 3GPP workshop to discuss LTE evolution in Release 12 and future releases.
This document discusses a novel reflector-based method for real-time monitoring of passive optical networks (PONs) without interrupting data traffic. The method uses reflectors placed at customer locations that reflect a monitoring wavelength back to the central office, allowing an optical time domain reflectometer (OTDR) to locate faults. The reflectors provide improved spatial resolution over conventional OTDR methods and allow monitoring of up to 32 branches of a PON. The passive, low-cost reflector technology allows easy installation and remote fault diagnosis, improving network maintenance efficiency.
WiMAX uses OFDM and smart antennas to improve performance. It provides QoS and improved security. The architecture includes mobile stations, base stations, an access service network gateway for traffic aggregation, and a connectivity service network for internet/network access. WiMAX antennas can be omnidirectional, sectoral, or panel designs. The protocol layers include the control, management, and data planes. OFDMA dynamically allocates bandwidth across frequency channels. While HSPA focuses on cellular mobility and data/voice, WiMAX provides broadband data through a new infrastructure.
Professor Mark Beach's presentation (without videos) on the University of Bristol's Massive MIMO activities as given at the IET's 'Towards 5G Mobile Technology – Vision to Reality' event, January 25th 2017.
Breast cancer detecting device using micro strip antennaSubham Dhar
The document describes a proposed design for a flexible microstrip patch antenna for breast cancer detection. It would work in the 2.2-2.45 GHz ISM band with a return loss of -30 dB or better. The design focuses on low skin heating, avoiding antenna arrays, and maximizing gain. It would be implanted on an F4F substrate to address issues with existing antenna designs. The document also provides background on breast cancer and discusses different detection techniques like mammography and MRI, as well as applications of antenna arrays in medical imaging and diagnosis.
Pantech provide supports on antenna design projects for final year students.. We guide you to implement both on simulation and hardware design.www.pantech proed.com
The document discusses Orthogonal Frequency Division Multiplexing (OFDM) and its applications in various wireless communication standards. It begins with the motivation for moving from single carrier to multi-carrier modulation schemes to support higher data rates. It then provides an overview of Frequency Division Multiplexing (FDM) and OFDM, explaining the basic principles of OFDM including orthogonality, modulation, and an illustrative example. The document discusses the OFDM transceiver and bit error rate performance in AWGN and Rayleigh fading channels. It also covers some applications and standards that use OFDM such as Digital Audio Broadcasting (DAB), Digital Video Broadcasting (DVB-T), and various IEEE 802.11 wireless networking standards.
Survey of Optimization of FFT processor for OFDM Receiversijsrd.com
This document summarizes research on optimizing FFT processors for OFDM receivers. It discusses how FFT/IFFT algorithms are critical components of OFDM systems that require optimization for throughput, area, and power. The document reviews different FFT processor architectures like pipelined and parallel. It proposes a FFT processor with a pipelined architecture and a CORDIC-based ROM-free twiddle factor generator to reduce complexity. Simulation results using MATLAB show the performance of an OFDM receiver with a 512-point FFT. The conclusion is that a pipelined architecture with CORDIC twiddle factor generation optimizes FFT processor performance for OFDM receivers.
This document describes a real-time MIMO-LTE test-bed developed by Telefónica I+D to test LTE technology. The test-bed includes a radio frontend module, communications and control module, and system processing module. It allows for demonstration of basic LTE operations and analysis of resource distribution and latency. Future work will focus on implementing advanced LTE technologies on a new hardware platform.
NetSim Webinar on Cognitive Radio NetworksSANJAY ANAND
Why use a Network Simulator for research ?
Introduction to NetSim
Cognitive Radio Basics
Designing Cognitive Radio networks using NetSim
Modifying Cognitive Radio source C code in NetSim
How to develop custom metrics?
Q & A
The document discusses various literature on OFDM and MC-CDMA techniques. It summarizes 17 research papers on topics like using wavelet packets instead of Fourier transform in MC-CDMA to improve bandwidth efficiency and reduce interference. It also discusses using techniques like DWT, Radon transform, and antenna diversity with MC-CDMA and comparing the BER performance of different approaches in various channel conditions like AWGN, Rayleigh fading and frequency selective fading channels. The rationale given is that replacing Fourier transform with wavelet packets in MC-CDMA can eliminate the need for cyclic prefix and improve spectral efficiency.
The document surveys 17 literature sources on multi-carrier modulation techniques like OFDM and MC-CDMA. Several sources propose using wavelet transforms instead of Fourier transforms to improve bandwidth efficiency and reduce interference for MC-CDMA systems. Simulation results from the literature show that wavelet packet based MC-CDMA can outperform FFT based MC-CDMA in terms of lower bit error rates, especially in frequency selective fading channels. The rationale given is that wavelet transforms eliminate the need for cyclic prefixes, thereby improving spectral efficiency over traditional MC-CDMA schemes.
MIMO Systems for Military Communication/Applications.IJERA Editor
The Military is embracing the communication revolution, turning to a new generation of sophisticated systems
to enable faster, richer, less costly, more flexible, reliable, compact, mobile, jam resistant, low probability of
detection, re configurable and spectrally efficient communication. Many of these features can be added to a
great extent in the existing systems, by utilising MIMO technology appropriately and judiciously. MIMO finds
applications in wireless communication, NLOS communication, satellite communication, HF communication,
Optical Fibre Communication. MIMO makes these technologies more suitable by introducing features
mandatory for military communication such as Ant jamming capability, Low Probability of Intercept, low
visibility of satellite earth Antennas by reducing their aperture area. MIMO can also provide redundancy by
employing no extra resources, thereby increasing reliability. MIMO is highly effective to communicate with
Unmanned Aerial Vehicles (1).
This document summarizes a research project comparing wavelet packet based MC-CDMA with conventional MC-CDMA using the Hilbert-Huang transform tool. The research aims to show that wavelet packet based MC-CDMA has better bit error rate performance than conventional MC-CDMA in dealing with channel fading and interference. It provides background on MC-CDMA and wavelet packet techniques. It outlines the methodology which involves simulation using MATLAB and the Hilbert-Huang transform tool for spectral analysis. The expected outcome is that wavelet packet MC-CDMA will demonstrate comparative superiority over conventional MC-CDMA.
Improvement of crankshaft MAC protocol for wireless sensor networks: a simula...IJECEIAES
Due to the dramatic growth in the use of Wireless Sensor Network (WSN) applications ranging from environment and habitat monitoring to tracking and surveillance, network research in WSN protocols has been very active in the last decade. With battery-powered sensors operating in unattended environments, energy conservation becomes the key technique for improving WSN lifetimes. WSN Medium Access Control (MAC) protocols address energy awareness and reduced duty cycles. The focus of this study is to investigate, through simulation, the effect of variations in various factors that influence the performance results of WSNs. Using MiXiM framework with OMNeT++ simulator, this simulation study proposes modifications in Crankshaft MAC protocol in order to improve its performance. The impact of duration and number of slots, degree of connectivity among the nodes, mobility speed and mobility update interval and also, the impact of sending data packets without preambles are investigated. Based on the simulation results, an improved version of the Crankshaft protocol for WSN is suggested and a comparative study of the performances of the original and improved protocol is presented. The results clearly indicate the superiority of the improved protocol over its original version.
This thesis examines channel estimation techniques for 3GPP LTE downlink. It introduces LTE physical layer specifications including frame structure and reference signals. It describes propagation models and channel models specified for LTE. It then focuses on pilot-assisted channel estimation methods for single-input single-output systems, including least squares and minimum mean square error estimation. Performance is evaluated using bit error rate and symbol error rate. Space-frequency block coding for multiple antenna systems is also discussed along with corresponding channel estimation and decoding.
This document proposes iterative clipping and error filtering methods to improve the performance of UFMC systems using SLM for 5G networks. Existing SLM techniques have high complexity and reduce spectral efficiency. The proposed method uses phase offset SLM in a UFMC system without needing to transmit side information, increasing data rate. It provides advantages over OFDM like low latency, high spectral efficiency, and lower out-of-band emissions. The performance of the proposed UFMC-SLM system will be evaluated using MATLAB simulations.
The document discusses the IEEE 802.22 standard for cognitive radio wireless regional area networks (WRANs). It describes how cognitive radio technology can help address the spectrum crunch by efficiently utilizing vacant TV bands and other licensed spectrum. The standard defines the MAC and PHY layer specifications for a cognitive radio system, including spectrum sensing, mobility, sharing, and a superframe structure to manage communication in available TV channels while avoiding interference with primary users. The goal is to provide wireless connectivity over distances of up to 30 km using the cognitive radio capabilities defined in the 802.22 standard.
In this presentation the effect of channel estimation errors on the energy efficiency of a down-link massive multiple-input multiple-output system is investigated and analyzed. The required down-link transmit power of the zero forcing (ZF) and maximum ratio transmission (MRT) precoding schemes are derived and analyzed under imperfect channel state information condition.
The document summarizes Deutsche Telekom's requirements and candidate technologies for 3GPP Release 12 and beyond. It discusses the need for significant capacity increases to meet growing mobile broadband demand through technologies like small cells, antenna arrays, and MIMO enhancements. It also addresses spectrum needs, improved inter-RAT functionality between LTE and UMTS, support for new services like proximity and M2M, and further HSPA enhancements. The presentation was given at a 3GPP workshop to discuss LTE evolution in Release 12 and future releases.
This document discusses a novel reflector-based method for real-time monitoring of passive optical networks (PONs) without interrupting data traffic. The method uses reflectors placed at customer locations that reflect a monitoring wavelength back to the central office, allowing an optical time domain reflectometer (OTDR) to locate faults. The reflectors provide improved spatial resolution over conventional OTDR methods and allow monitoring of up to 32 branches of a PON. The passive, low-cost reflector technology allows easy installation and remote fault diagnosis, improving network maintenance efficiency.
WiMAX uses OFDM and smart antennas to improve performance. It provides QoS and improved security. The architecture includes mobile stations, base stations, an access service network gateway for traffic aggregation, and a connectivity service network for internet/network access. WiMAX antennas can be omnidirectional, sectoral, or panel designs. The protocol layers include the control, management, and data planes. OFDMA dynamically allocates bandwidth across frequency channels. While HSPA focuses on cellular mobility and data/voice, WiMAX provides broadband data through a new infrastructure.
Professor Mark Beach's presentation (without videos) on the University of Bristol's Massive MIMO activities as given at the IET's 'Towards 5G Mobile Technology – Vision to Reality' event, January 25th 2017.
Breast cancer detecting device using micro strip antennaSubham Dhar
The document describes a proposed design for a flexible microstrip patch antenna for breast cancer detection. It would work in the 2.2-2.45 GHz ISM band with a return loss of -30 dB or better. The design focuses on low skin heating, avoiding antenna arrays, and maximizing gain. It would be implanted on an F4F substrate to address issues with existing antenna designs. The document also provides background on breast cancer and discusses different detection techniques like mammography and MRI, as well as applications of antenna arrays in medical imaging and diagnosis.
Pantech provide supports on antenna design projects for final year students.. We guide you to implement both on simulation and hardware design.www.pantech proed.com
The document discusses Orthogonal Frequency Division Multiplexing (OFDM) and its applications in various wireless communication standards. It begins with the motivation for moving from single carrier to multi-carrier modulation schemes to support higher data rates. It then provides an overview of Frequency Division Multiplexing (FDM) and OFDM, explaining the basic principles of OFDM including orthogonality, modulation, and an illustrative example. The document discusses the OFDM transceiver and bit error rate performance in AWGN and Rayleigh fading channels. It also covers some applications and standards that use OFDM such as Digital Audio Broadcasting (DAB), Digital Video Broadcasting (DVB-T), and various IEEE 802.11 wireless networking standards.
Survey of Optimization of FFT processor for OFDM Receiversijsrd.com
This document summarizes research on optimizing FFT processors for OFDM receivers. It discusses how FFT/IFFT algorithms are critical components of OFDM systems that require optimization for throughput, area, and power. The document reviews different FFT processor architectures like pipelined and parallel. It proposes a FFT processor with a pipelined architecture and a CORDIC-based ROM-free twiddle factor generator to reduce complexity. Simulation results using MATLAB show the performance of an OFDM receiver with a 512-point FFT. The conclusion is that a pipelined architecture with CORDIC twiddle factor generation optimizes FFT processor performance for OFDM receivers.
OFDM: Modulation Technique for Wireless CommunicationAM Publications
Orthogonal Frequency Division Multiplexing (OFDM) has become the modulation technique for many wireless
communication standards. In a wireless system, a signal transmitted into channel bounces off from various surfaces resulting
in multiple delayed versions of the transmitted signal arriving at the receiver. The multiple signals are received due to the
reflections from large objects, diffraction of electromagnetic waves around objects .This causes the received signal to be
distorted. OFDM provides tolerance to such frequency selective channels and provides high data rates. In this paper we propose to analyze the theory of OFDM, simulate the OFDM transceiver using MATLAB and perform BER analysis.
This document summarizes an OFDM channel estimation project. It discusses the objective to maximize OFDM system capacity through channel estimation and adaptive transmission. It outlines the system architecture, including the transmitter, channel, receiver, and channel estimation. It also lists the work completed, such as programs for channel impulse response, Rayleigh fading, and adding noise.
This document describes an OFDM simulation program in MATLAB. It reads in a bitmap image file, divides the image data into frames, performs OFDM modulation and transmission over a channel with noise, and implements OFDM demodulation and decoding at the receiver to reconstruct the transmitted image. Key steps include OFDM parameter configuration, modulation of multiple frames, addition of noise in the channel, frame detection at the receiver, demodulation of frames, and calculation of error metrics between transmitted and received data.
In this slide deck we cover:
- Understanding the relationship between OFDM theory and practice
- Starting from a Matlab script through to automatic HDL code/bitstream generation
- Introduction to Nutaq’s PicoSDR hardware and software
- Creating host applications to exchange data with the PicoSDR in real-time
Image transmission in ofdm using m ary psk modulation schemes –a comparitive ...eSAT Journals
This document summarizes a study that compares the performance of different modulation schemes for transmitting images over an OFDM system under noisy channel conditions. It is found that BPSK and QPSK modulation schemes perform better than 16-PSK and 256-PSK for image transmission when the signal-to-noise ratio is less than 12dB, with lower bit error rates and fewer errors in received pixel values. For higher SNR scenarios, 16-PSK provides higher data rates but requires SNR above 12dB for acceptable image quality. 256-PSK has the highest data rate but very high bit error rates below SNR of 60dB, resulting in poor received image quality.
This document summarizes a student project on OFDM transmitters and receivers. It includes an introduction to OFDM that describes its use of orthogonal subcarriers. It also compares single carrier modulation to multi-carrier modulation using OFDM. The document outlines the basic OFDM transmitter and receiver block diagrams. It discusses the constellation mapper, IFFT block, cyclic prefix, and design approaches for these blocks. Simulation results are presented comparing transmitted and received signals. BER performance is evaluated for different modulation schemes like QPSK and QAM. The document concludes that OFDM provides high bandwidth efficiency and overcomes interference through the IFFT and cyclic prefix.
This document discusses VLSI implementation of orthogonal frequency division multiplexing (OFDM). It provides background on OFDM, explaining that it consists of multiple closely spaced carriers that can achieve high data transmission rates with wide bandwidths. The document outlines the key components of an OFDM transceiver including scrambling, interleaving, constellation mapping, IFFT/FFT processing, and parallel-to-serial conversion. It describes the hardware implementation of these components and advantages of OFDM such as robustness to interference and insensitivity to timing errors.
The document lists MATLAB projects in the areas of signal processing, image processing, and electrical and electronics engineering. Some example projects described include implementation of OFDM over communication channels, speech signal preprocessing using LPC filters, speaker recognition systems, noise reduction using adaptive filters, and image processing topics like fingerprint recognition and image compression. The list provides potential ideas for engineering students to explore using MATLAB simulations and modeling.
This document presents a summary of a student's project on analyzing the performance of OFDM over AWGN and Rayleigh channels using MATLAB simulation. The project includes implementing an OFDM transmitter and receiver in MATLAB, transmitting serial data over AWGN and Rayleigh channels, and analyzing the bit error rate performance in both cases. The simulation results show that the bit error rate decreases rapidly with increasing signal-to-noise ratio for the AWGN channel, while it decreases more slowly for the Rayleigh channel. The performance analysis verifies the effectiveness of OFDM transmission over wireless channels.
This introduction illustrates an OFDM data transmission using example values. Initially a pilot sequence initializes the equalizer according to the frequency-selective channel. Then a data sequence forming an OFDM symbol is sent and can be detected ISI-free.
Multiuser MIMO-OFDM simulation framework in MatlabPavel Loskot
Simulation framework for multiuser MIMO-OFDM over multipath fading channels. Also created a C-like pre-processor in Matlab to add flexibility in configuring the simulation prior its run.
Design Ofdm System And Remove Nonlinear Distortion In OFDM Signal At Transmit...Rupesh Sharma
although OFDM seems to be a solution to keep up with
the demand of increasing data rates, it has some drawbacks.
Sensitivity to high PAPR is the most significant of these
drawbacks. The main objective of this paper was to investigate
and document the effects of PAPR on the performance of OFDM
based digital communications under different channel conditions.
A step-by-step approach was adopted in order to achieve the
objective of this paper. The first step is to provide a basic
background on the principles of OFDM. The reasons for the
PAPR and a theoretical analysis of these effects on OFDM
systems are documented. The OFDM system has a high peak-toaverage
power ratio (PAPR) that can cause unwanted saturation
in the power amplifiers, leading to in-band distortion and out-ofband
radiation. To be able to observe the system behavior, the
simulation results for different channel models are presented in
graphical form. Next, the simulation results obtained in this work
are compared to the simulation results reported in related studies
The document discusses channel modeling and Kalman filter-based estimation for OFDM wireless communication systems. It provides an introduction to OFDM systems and outlines the channel modeling process, including modeling the channel as a multipath frequency selective fading channel using a tapped delay line. It also discusses implementing channel estimation using a Kalman filter and presenting results on simulating OFDM signal transmission through a Rayleigh fading channel. The goal is to accurately estimate the channel fading parameters using a joint time-frequency domain estimation model.
OFDM (Multiplexación por División de Frecuencia Ortogonal) es una técnica de comunicación que divide un canal de frecuencia en subportadoras equiespaciadas, cada una transportando una porción de la información del usuario. Las subportadoras son ortogonales entre sí para evitar la banda de guarda y permitir un uso eficiente del espectro. OFDM soporta distorsión por atenuación y desvanecimiento sin necesidad de ecualizadores complejos. Tiene aplicaciones como transmisión de datos inalámbricos, radio digital, ADSL y redes inal
OFDM (Orthogonal Frequency Division Multiplexing) is a digital modulation technique that divides the available spectrum into multiple orthogonal subcarriers. It has become popular for digital communication systems due to its ability to mitigate multi-path interference through the use of a guard interval between symbols. OFDM allows for high bandwidth efficiency by overlapping subcarriers and its implementation has been enabled by advances in DFT and LSI technology.
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive functioning. Exercise causes chemical changes in the brain that may help protect against mental illness and improve symptoms.
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This document discusses reducing peak-to-average power ratio (PAPR) in MIMO-OFDM systems using linear companding transforms. It proposes applying companding transforms like linear companding transform (LCT) and linear nonsymmetrical companding transform (LNST) to reduce PAPR without restricting system parameters. The method aims to achieve a very low PAPR, reduce signal degradation from nonlinear power amplifiers, and have high spectral efficiency and signal-to-noise ratio while staying within bandwidth and complexity limits. The performance is analyzed through MATLAB simulations.
Integrated approach for efficient power consumption and resource allocation i...IJECEIAES
This document presents a proposed integrated approach for efficient power consumption and resource allocation in a MIMO-OFDMA system. The proposed system is analyzed and compared to existing MIMO-OFDMA systems through simulation. It is found that the proposed system, which incorporates parallel cancellation techniques and convolutional encoding/decoding, achieves better resource allocation by minimizing bit error rate and lowest power consumption at lower bit error rates compared to existing approaches.
This document analyzes the performance of adaptive subcarrier allocation in coherent optical OFDM systems. It proposes two allocation schemes: proportional allocation and equal allocation. Proportional allocation aims to maximize data rate while ensuring fairness among users by assigning subcarriers to the user with the highest SNR for that subcarrier, as long as it does not exceed their proportional share. Equal allocation simply divides subcarriers equally among all users. The document models an optical OFDM system transmitting over 1000km of single-mode fiber and investigates how adaptive subcarrier allocation can improve performance compared to static allocation schemes.
This document evaluates and compares the performance of GFDM and OFDM waveforms in an LTE-A system level study. It finds that GFDM can achieve around 6dB reduction in out-of-band radiation compared to OFDM. BER, PER and throughput are similar between the two waveforms in different channel conditions. GFDM's out-of-band radiation can be reduced further using techniques like guard symbols or windowing. The document concludes that GFDM is a promising candidate for 5G waveforms.
The document compares wavelet packet based MC-CDMA to conventional MC-CDMA. It proposes using wavelet packets instead of sinusoidal carriers for MC-CDMA. Wavelet packets have lower sidelobes, better time-frequency localization, and maintain orthogonality for overlapped signals. This improves performance by reducing interference and relaxing separation requirements between signals. Simulation results show the proposed wavelet packet based MC-CDMA outperforms conventional MC-CDMA, especially in combating fading channels.
Performance Analysis of BER and Throughput of Different MIMO Systems using Di...IRJET Journal
The document discusses performance analysis of different MIMO systems using various modulation techniques. It analyzes bit error rate (BER) and throughput of MIMO-OFDM downlink systems using QPSK, 16QAM and 64QAM modulation. MIMO-OFDM combines multiple-input multiple-output (MIMO) technology with orthogonal frequency-division multiplexing (OFDM) to improve data rates and reliability in wireless communications. The analysis found that higher order modulations like 16QAM and 64QAM achieve higher data rates but at the cost of increased BER, while lower order modulations like QPSK provide better BER performance. SNR and guard intervals in the OFDM signal were also found to improve system performance.
This document discusses a project analyzing the performance of MIMO-OFDM systems in Rayleigh fading channels. MIMO-OFDM is a popular technique for mobile communications that uses multiple antennas at the transmitter and receiver to improve data rates and capacity. The project compares the ergodic and outage capacities of MIMO-OFDM systems with varying numbers of transmit and receive antennas and analyzes performance metrics like SNR and BER. It aims to evaluate MIMO-OFDM prototype performance and investigate methods for cost reduction.
Design of time division multiplexing/wavelength division multiplexing passiv...IJECEIAES
This paper presents the design of time division multiplexing-wavelength division multiplexing-passive optical network (TDM-WDM PON). In this design, the current TDM PON is incorporated with the proposed WDM-PON in order to design a high-capacity network with lower loss requirements. The design has been simulated using OptiSystem software. The upstream wavelength for WDM is between 1,530.334 to 1,542.142 nm while for TDM is 1,310 nm. The downstream wavelength for WDM is from 1,569.865 to 1,581.973 nm, while for TDM is 1,490 nm. Based on the result, it is found that the proposed network is capable to support up to 64 customers with a bit rate of 2.5 Gbps.
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
DYNAMIC OPTIMIZATION OF OVERLAPAND- ADD LENGTH OVER MBOFDM SYSTEM BASED ON SN...cscpconf
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, zeropadded
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 MBOFDM system on Bit Error Rate (BER) with
AWGN channel and Saleh-Valenzuela (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 MBOFDM system. In fact
we developed a technique to select the length of ZP as function of SNR and CIR
estimate(repetition). In our simulation this technique improve to 3 dB at BER=10-2 with a
multipath channels CM4.
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, zeropadded
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 MBOFDM system on Bit Error Rate (BER) with
AWGN channel and Saleh-Valenzuela (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 MBOFDM system. In fact
we developed a technique to select the length of ZP as function of SNR and CIR
estimate(repetition). In our simulation this technique improve to 3 dB at BER=10-2 with a
multipath channels CM4.
IRJET-Spectrum Allocation Policies for Flex Grid Network with Data Rate Limit...IRJET Journal
This document discusses spectrum allocation policies for flex grid networks with data rate limited transmission. It begins with an abstract that outlines the tradeoff between data rate, allocated frequency slots, and modulation format that must be considered for spectrum allocation. It then discusses the objectives of identifying optical paths, path lengths, selecting modulation schemes, and finding optimal routes. The methodology section covers factors considered for spectrum allocation like modulation formats, noise, crosstalk, and transmission distances limited by noise and crosstalk for different modulation formats and fiber core counts. Implementation details algorithms for network setup, finding shortest paths, candidate path selection, and spectrum allocation. Results show fragmentation increases with demand but is constant for some core fibers. Higher core counts provide advantages and lower request
MIMO-OFDM WIRELESS COMMUNICATION SYSTEM PERFORMANCE ANALYSIS FOR CHANNEL ESTI...IRJET Journal
This document discusses channel estimation techniques for MIMO-OFDM wireless communication systems. It proposes a hybrid Wiener filter-based pilot-based channel estimator that requires significantly fewer calculations than other methods. It also develops an FFT-based channel estimation technique with lower complexity. The document evaluates the performance of these pilot-based channel estimation schemes and compares them to existing blind channel estimation methods. It suggests novel resource grid configurations that improve the performance of blind channel estimation in MIMO-OFDM systems while reducing the number of required receive antennas.
IRJET- Survey Paper on Paper Reduction for MIMO-OFDM Systems using PTS SchemeIRJET Journal
This document summarizes research on techniques to reduce peak-to-average power ratio (PAPR) in MIMO-OFDM systems. It discusses how PAPR significantly affects OFDM and can cause nonlinearity in high power amplifiers. The paper focuses on using partial transmit sequence techniques to reduce PAPR. It reviews related work applying techniques like iterative clipping and filtering, partial transmit sequences, and adaptive selected mapping to reduce PAPR. The document also discusses system models for MIMO-OFDM and analyzing PAPR reduction performance.
A Novel Carrier Indexing Method for Side Lobe Suppression and Bit Error Rate ...IRJET Journal
This paper proposes a novel carrier indexing method using variable basis functions to suppress side lobes and reduce bit error rates in non-continuous OFDM (NC-OFDM) systems. Existing active interference cancellation techniques used fixed-length rectangular basis functions for cancellation carriers, which were not optimal. The proposed method groups cancellation carriers by frequency position and shapes them with variable-length waveforms to more effectively suppress NC-OFDM side lobes while reducing inter-carrier interference. Simulation results show the proposed approach achieves over 80dB side lobe reduction and negligible inter-carrier interference compared to existing techniques. The method provides reliable data transmission between primary and secondary nodes in cognitive radio networks with lower bit error rates.
On the performance of non-orthogonal multiple access (NOMA) using FPGAIJECEIAES
In this paper, non-orthogonal multiple access (NOMA) is designed and implemented for the fifth generation (5G) of multi-user wireless communication. Field-programmable gate array (FPGA) is considered for the implementation of this technique for two users. NOMA is applied in downlink phase of the base-station (BS) by applying power allocation mechanism for far and near users, in which one signal contains the superposition of two scaled signals depending on the distance of each user from the BS. We assume an additive white Gaussian noise (AWGN) channel for each user in the presence of the interference due to the non-orthogonality between the two users’ signals. Therefore, successive-interference cancellation (SIC) is exploited to remove the undesired signal of the other user. The outage probability and the biterror rate performance are presented over different signal-to-interference-plus-noise ratio (SINR). Furthermore, Monte-Carlo simulations via Matlab are utilized to verify the results obtained by FPGA, which show exact-close match.
Performance analysis of multilayer multicast MANET CRN based on steiner minim...TELKOMNIKA JOURNAL
In this study, the multicast mobile ad hoc (MANET) CRN has been developed, which involves multi-hop and multilayer consideration and Steiner minimal tree (SMT) algorithm is employed as the router protocol. To enhance the network performance with regards to throughput and packet delivery rate (PDR), as channel assignment scheme, the probability of success (POS) is employed that accounts for the channel availability and the time needed for transmission when selecting the best channel from the numerous available channels for data transmission from the source to all destinations nodes effectively. Within Rayleigh fading channels under various network parameters, a comparison is done for the performance of SMT multicast (MANET) CRN with POS scheme versus maximum data rate (MDR), maximum average spectrum availability (MASA) and random channel assignment schemes. Based on the simulation results, the SMT multicast (MANET) CRN with POS scheme was seen to demonstrate the best performance versus other schemes. Also, the results proved that the throughput and PDR performance are improved as the number the primary channels and the channel’s bandwidth increased while dropped as the value of packet size D increased. The network’s performance grew with rise in the value of idle probability (푃퐼) since the primary user’s (PU) traffic load is low when the value of 푃퐼 is high.
A simulation study of wi max based communication system using deliberately cl...eSAT Journals
This document summarizes a study on reducing peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) systems using deliberate clipping. It begins with an introduction to WiMAX technology and OFDM. It then discusses the PAPR problem in OFDM systems and different techniques to reduce PAPR, including signal scrambling and signal distortion methods. It focuses on deliberate clipping as a simple method to limit PAPR by distorting the signal before amplification. The document presents a simulation of an OFDM system using deliberate clipping at the Nyquist sampling rate to investigate its effect on bit error rate performance compared to an unclipped system.
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This document provides a list of 974 power electronics projects covering topics like inverters, converters, motor control, DSP, FPGA, closed loop control concepts, and multilevel converters. The projects utilize technologies like the TMS320F2812 and dsPIC for control and were conducted between 2017-2018 addressing applications in renewable energy, electric vehicles, industrial drives, and wireless power.
Pantech offers b.tech and m.tech projects for engineering students.We support on MIMO concepts, OFDM, CR Networks, 4G and 5 G, NS3, IoT with NS3, VANET, MANET
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An improved modulation technique suitable for a three level flying capacitor ...IJECEIAES
This research paper introduces an innovative modulation technique for controlling a 3-level flying capacitor multilevel inverter (FCMLI), aiming to streamline the modulation process in contrast to conventional methods. The proposed
simplified modulation technique paves the way for more straightforward and
efficient control of multilevel inverters, enabling their widespread adoption and
integration into modern power electronic systems. Through the amalgamation of
sinusoidal pulse width modulation (SPWM) with a high-frequency square wave
pulse, this controlling technique attains energy equilibrium across the coupling
capacitor. The modulation scheme incorporates a simplified switching pattern
and a decreased count of voltage references, thereby simplifying the control
algorithm.
Advanced control scheme of doubly fed induction generator for wind turbine us...IJECEIAES
This paper describes a speed control device for generating electrical energy on an electricity network based on the doubly fed induction generator (DFIG) used for wind power conversion systems. At first, a double-fed induction generator model was constructed. A control law is formulated to govern the flow of energy between the stator of a DFIG and the energy network using three types of controllers: proportional integral (PI), sliding mode controller (SMC) and second order sliding mode controller (SOSMC). Their different results in terms of power reference tracking, reaction to unexpected speed fluctuations, sensitivity to perturbations, and resilience against machine parameter alterations are compared. MATLAB/Simulink was used to conduct the simulations for the preceding study. Multiple simulations have shown very satisfying results, and the investigations demonstrate the efficacy and power-enhancing capabilities of the suggested control system.
Software Engineering and Project Management - Introduction, Modeling Concepts...Prakhyath Rai
Introduction, Modeling Concepts and Class Modeling: What is Object orientation? What is OO development? OO Themes; Evidence for usefulness of OO development; OO modeling history. Modeling
as Design technique: Modeling, abstraction, The Three models. Class Modeling: Object and Class Concept, Link and associations concepts, Generalization and Inheritance, A sample class model, Navigation of class models, and UML diagrams
Building the Analysis Models: Requirement Analysis, Analysis Model Approaches, Data modeling Concepts, Object Oriented Analysis, Scenario-Based Modeling, Flow-Oriented Modeling, class Based Modeling, Creating a Behavioral Model.
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