The in-line optical signal amplification is often used in optical communication systems to accomplish longer transmission distances and larger capacity. In this proposed paper, the operation of two types of optical amplifiers for 16×10 Gbps wavelength division multiplexing system had been examined by changing transmission distance from 10 to 200 km with a dispersion equals to 16.75 ps/nm/km. The analysis and design of such systems ordinarily includes many signal channels, nonlinear devices, several topologies with many noise sources, is extremely complex and effort-exhaustive. Therefore, theoretical studies with simulation CAD software of systems are become necessity to predict and optimize system performance. The comparison between EDFA and Raman has already explored by many researchers in varying ways in this work and to achieve obove objectives, the OptiSystem software was used to design the proposed fiber optic communications system and to simulate results. Performance for the present system was evaluated for parameters like bit error rate (BER), quality factor (QF), total gain with eye opening factor. It was saw that EDFA provides better results, in the maximal transmission distance 64% better than Raman amplifier, 57.5% for amplification gain and 26.7% for maximum quality factor. As a future study a hybrid amplifier can produce better quality of amplification.
Performance evaluation of 1 tbps qpsk dwdm system over isowceSAT Journals
This document describes the simulation of a 1 terabit per second quadrature phase-shift keying wavelength division multiplexing system over an optical wireless communication link. The system uses 10 channels each modulated with QPSK at 100 gigabits per second. The performance is evaluated in terms of quality factor and bit error rate at distances ranging from 10,000 to 50,000 kilometers. The results show acceptable quality factors and bit error rates over this distance range when the transmitted power is between 0 and 40 dBm.
Simulation and optimization of a tuneable rectangular microstrip patch antenn...TELKOMNIKA JOURNAL
In this paper, a tuneable rectangular microstrip patch antenna (MPA) is simulated and optimized to operate in four frequency bands of the next generation of wireless communication systems. The proposed design incorporates a copper radiating patch with four implanted graphene strips for tuning purposes. The reconfigurable surface impedance of graphene can easily be altered by applying a DC voltage bias directly to the graphene strips, allowing the operating frequency of the antenna to be tuned as desired. The capability of the applied voltage to tune the operating frequency band of the proposed antenna is studied via computer simulation technology (CST) microwave studio (MWS). Frequency selective surfaces (FSSs) are introduced in order to improve the radiation parameters of the antenna. The operating frequency band of the tuneable rectangular MPA increases directly as the applied DC voltage bias is increased. Based on the simulation results, a tuneable rectangular MPA placed between two FSSs is proposed for fifth-generation applications.
Building impedance matching network based on s parameter from manufacturerJournal Papers
The document describes a method for building an impedance matching network for a transistor using S-parameter data and optimization tools in ADS simulation software. The transistor of interest operates from 220-270 MHz, where reference designs are unavailable. Input and output impedances are extracted from S-parameter files. An existing matching network design at a nearby frequency is used as a starting point. Optimization replaces ideal components with real ones, achieving over 30 dB return loss while degrading slightly from the ideal simulation. The method demonstrates synthesizing a matching network when reference designs are unavailable.
Performance evaluation of 2-port MIMO LTE-U terminal antenna with user’s hand...journalBEEI
This paper presents the performance evaluation of 2-port MIMO antenna for LTE-U sub 6 GHz band. The evaluation focuses on the effect of user’s hand in a uniform environment and the analysis were carried out on simulation and measurement data of antenna ports. Results show that the highest performance of the design is on the frequency range from 4.5 GHz to 5.5 GHz, and the ports have low envelope correlation coefficient (ECC) less than 0.16 in both cases of without and with user’s hand. However, the presence of the user’s hand reduces mean effective gain (MEG) of ports and diversity combining gain by more than 1.6 dB compared with no-hand case. The multiplexing efficiency is around 81% and reduced by the presence of the user’s hand to 55%. Despite this reduction; the design shows high spatial multiplexing capability in both cases. The capacity carried by the second transmission eigenmode is about 39% from the total capacity under waterfilling algorithm transmit power allocation.
Comparison of coherent optical transmission systems performance by DP-QAM lev...IJECEIAES
In this paper, we investigated the Coherent Optical Transmission System (COTS) performance for multiple types of DP-QAM levels considering various CW laser input power. We compared the performance of COTS for 100 Gb/s with DP-32QAM, DP-64QAM and DP-128QAM respectively. We also inspected the relationship among Optical Signal to Noise Ratio (OSNR), Error Vector Magnitude (EVM) and Bit Error Rate (BER) which are found in accordance for both simulation curves and constellation diagrams. Results are obtained by experiments with DP-32QAM, DP64QAM and DP-128QAM modulations techniques at symbol rate of 10 Gsymbol/s, 8.33 Gsymbol/s and 7.142 Gsymbol/s respectively. This work is completely based on simulation in Optisystem simulation setup.
Sparse channel estimation by pilot allocation in MIMO-OFDM systems IRJET Journal
This document summarizes research on sparse channel estimation techniques for MIMO-OFDM systems using compressed sensing theory. It describes how compressed sensing algorithms like Subspace Pursuit (SP) and CoSaMP can provide better channel estimation performance than conventional techniques like least squares estimation. SP and CoSaMP are greedy algorithms that iteratively select columns from the measurement matrix to minimize mean square error. Simulation results showed these compressed sensing algorithms reduce mean square error and bit error rate compared to normal channel estimation.
Computer-Based Analysis of The Performance of Different Modulation Techniques...theijes
This document analyzes the performance of different modulation techniques in WCDMA systems with different channels. It compares M-PSK and M-Ary PAM modulation in Rayleigh fading and AWGN channels using MATLAB/Simulink. The results show that M-PAM in AWGN channels has lower bit error rates compared to M-PSK, while M-PSK in Rayleigh fading performs better than M-PAM. As modulation levels and simulation time increase, bit error rates also increase, though irregularly in Rayleigh fading channels. Overall, the best technique depends on the channel conditions and system requirements.
This document describes a simulation of an optical orthogonal frequency division multiplexing (OFDM) system using different M-ary quadrature amplitude modulation (QAM) techniques. The performance of the system was evaluated in terms of bit error rate (BER) and signal-to-noise ratio (SNR) by varying the modulation order M to 16, 64, and 256. Simulation results showed that higher modulation orders require higher SNR values to achieve the same BER as lower modulation orders. The simulated results closely matched theoretical predictions, though there was a deviation of 3-3.5 dB, likely due to additional noise and losses not accounted for in the theoretical model.
Performance evaluation of 1 tbps qpsk dwdm system over isowceSAT Journals
This document describes the simulation of a 1 terabit per second quadrature phase-shift keying wavelength division multiplexing system over an optical wireless communication link. The system uses 10 channels each modulated with QPSK at 100 gigabits per second. The performance is evaluated in terms of quality factor and bit error rate at distances ranging from 10,000 to 50,000 kilometers. The results show acceptable quality factors and bit error rates over this distance range when the transmitted power is between 0 and 40 dBm.
Simulation and optimization of a tuneable rectangular microstrip patch antenn...TELKOMNIKA JOURNAL
In this paper, a tuneable rectangular microstrip patch antenna (MPA) is simulated and optimized to operate in four frequency bands of the next generation of wireless communication systems. The proposed design incorporates a copper radiating patch with four implanted graphene strips for tuning purposes. The reconfigurable surface impedance of graphene can easily be altered by applying a DC voltage bias directly to the graphene strips, allowing the operating frequency of the antenna to be tuned as desired. The capability of the applied voltage to tune the operating frequency band of the proposed antenna is studied via computer simulation technology (CST) microwave studio (MWS). Frequency selective surfaces (FSSs) are introduced in order to improve the radiation parameters of the antenna. The operating frequency band of the tuneable rectangular MPA increases directly as the applied DC voltage bias is increased. Based on the simulation results, a tuneable rectangular MPA placed between two FSSs is proposed for fifth-generation applications.
Building impedance matching network based on s parameter from manufacturerJournal Papers
The document describes a method for building an impedance matching network for a transistor using S-parameter data and optimization tools in ADS simulation software. The transistor of interest operates from 220-270 MHz, where reference designs are unavailable. Input and output impedances are extracted from S-parameter files. An existing matching network design at a nearby frequency is used as a starting point. Optimization replaces ideal components with real ones, achieving over 30 dB return loss while degrading slightly from the ideal simulation. The method demonstrates synthesizing a matching network when reference designs are unavailable.
Performance evaluation of 2-port MIMO LTE-U terminal antenna with user’s hand...journalBEEI
This paper presents the performance evaluation of 2-port MIMO antenna for LTE-U sub 6 GHz band. The evaluation focuses on the effect of user’s hand in a uniform environment and the analysis were carried out on simulation and measurement data of antenna ports. Results show that the highest performance of the design is on the frequency range from 4.5 GHz to 5.5 GHz, and the ports have low envelope correlation coefficient (ECC) less than 0.16 in both cases of without and with user’s hand. However, the presence of the user’s hand reduces mean effective gain (MEG) of ports and diversity combining gain by more than 1.6 dB compared with no-hand case. The multiplexing efficiency is around 81% and reduced by the presence of the user’s hand to 55%. Despite this reduction; the design shows high spatial multiplexing capability in both cases. The capacity carried by the second transmission eigenmode is about 39% from the total capacity under waterfilling algorithm transmit power allocation.
Comparison of coherent optical transmission systems performance by DP-QAM lev...IJECEIAES
In this paper, we investigated the Coherent Optical Transmission System (COTS) performance for multiple types of DP-QAM levels considering various CW laser input power. We compared the performance of COTS for 100 Gb/s with DP-32QAM, DP-64QAM and DP-128QAM respectively. We also inspected the relationship among Optical Signal to Noise Ratio (OSNR), Error Vector Magnitude (EVM) and Bit Error Rate (BER) which are found in accordance for both simulation curves and constellation diagrams. Results are obtained by experiments with DP-32QAM, DP64QAM and DP-128QAM modulations techniques at symbol rate of 10 Gsymbol/s, 8.33 Gsymbol/s and 7.142 Gsymbol/s respectively. This work is completely based on simulation in Optisystem simulation setup.
Sparse channel estimation by pilot allocation in MIMO-OFDM systems IRJET Journal
This document summarizes research on sparse channel estimation techniques for MIMO-OFDM systems using compressed sensing theory. It describes how compressed sensing algorithms like Subspace Pursuit (SP) and CoSaMP can provide better channel estimation performance than conventional techniques like least squares estimation. SP and CoSaMP are greedy algorithms that iteratively select columns from the measurement matrix to minimize mean square error. Simulation results showed these compressed sensing algorithms reduce mean square error and bit error rate compared to normal channel estimation.
Computer-Based Analysis of The Performance of Different Modulation Techniques...theijes
This document analyzes the performance of different modulation techniques in WCDMA systems with different channels. It compares M-PSK and M-Ary PAM modulation in Rayleigh fading and AWGN channels using MATLAB/Simulink. The results show that M-PAM in AWGN channels has lower bit error rates compared to M-PSK, while M-PSK in Rayleigh fading performs better than M-PAM. As modulation levels and simulation time increase, bit error rates also increase, though irregularly in Rayleigh fading channels. Overall, the best technique depends on the channel conditions and system requirements.
This document describes a simulation of an optical orthogonal frequency division multiplexing (OFDM) system using different M-ary quadrature amplitude modulation (QAM) techniques. The performance of the system was evaluated in terms of bit error rate (BER) and signal-to-noise ratio (SNR) by varying the modulation order M to 16, 64, and 256. Simulation results showed that higher modulation orders require higher SNR values to achieve the same BER as lower modulation orders. The simulated results closely matched theoretical predictions, though there was a deviation of 3-3.5 dB, likely due to additional noise and losses not accounted for in the theoretical model.
Performance evaluation of path loss parameters for broadcasting applicationseSAT Publishing House
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
Design of wideband dielectric resonator antenna with square slots excited usi...Conference Papers
The document describes the design of a wideband dielectric resonator antenna (DRA) with square slots for 5G communication applications operating at 26 GHz. Square slots of two different sizes are introduced in the DRA to reduce its quality factor and achieve a bandwidth of 3 GHz (11.5%) from 25-28 GHz. The DRA is excited using a microstrip feed line. Simulation results show the proposed antenna achieves a peak gain of 4.8 dBi and radiation efficiency of 93%. Compared to reference DRAs, the proposed antenna with slots provides the widest bandwidth for 5G millimeter-wave applications.
The presentation is about Adaptive Beamforming for high data-rate applications. Analog beamforming, which is considered a cost effective solution for consumer devices are investigated. Two adaptive analog beamforming algorithms, i.e., a well-known perturbation-based and dmr-based which overcomes the drawbacks of perturbation-based algorithm are discussed in-detail and their performance comparisons are made with the help of computer simulations. Also variation of single-port structure is considered and it's benefits are exploited with the help of modified analog beamforming algorithms.
Enabling full-duplex in multiple access technique for 5G wireless networks ov...TELKOMNIKA JOURNAL
This document analyzes the performance of a two-user non-orthogonal multiple access (NOMA) network where one user is served directly by the base station and the other is served via an unmanned aerial vehicle (UAV) relay operating in full-duplex mode. It derives the exact outage probabilities of the two users under Rician fading channels. The analysis provides guidelines for designing UAV-enabled wireless networks using NOMA techniques. Key results include the outage probabilities accounting for interference at both the UAV relay and users under different self-interference conditions at the relay.
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.
Pulse shaping methods for inter carrier interference reduction in OFDM systemTELKOMNIKA JOURNAL
The weakness of the orthogonal freuency division multiplexing (OFDM) system is susceptible to the existence of carrier frequency offset (CFO) which causes the emergence of inter carrier interference (ICI) which causes a degradation of performance OFDM systems. This study aims to apply the suggested rectangular (REC) pulse and improved sinc-power (ISP) pulse shaping methods on OFDM system and determines ICI reduction with the effects of CFO over flat fading Rayleigh channels. The performance of each pulse shaping method is evaluated and compared based on parameter ICI power vs. normalized frequency offset, signal to interference ratio (SIR) vs. normalized frequency offset and bit error rate (BER) vs. energy bit per noise (Eb/No). The simulation result in terms of BER vs. Eb/No indicated that REC and ISP pulse shaping has better performance dealing with ICI reduction compared to OFDM system no applied pulse shaping. In addition, the ISP is able to mitigate ICI better than REC.
IRJET- Optimizing Different Parameters of Inter-Satellite Optical Wireless Co...IRJET Journal
This document discusses optimizing an inter-satellite optical wireless communication (IS-OWC) system by incorporating a Mach Zehnder interferometer (MZI) with duobinary modulation. The system is designed to transmit data rates up to 100 Gbps over distances of up to 8,000 km. The performance is analyzed by varying parameters like antenna aperture size, transmit power, data rate, and pointing error. Results show that larger aperture sizes, higher powers, and lower data rates and pointing errors improve quality as measured by Q-factor. Incorporating an MZI filter helps remove unwanted signals and enhance performance compared to a simple duobinary system.
Adjustment of Cost 231 Hata Path Model For Cellular Transmission in Rivers StateIOSR Journals
The document presents an adjustment of the COST 231 Hata path loss model for predicting radio signal propagation in Rivers State, Nigeria. Field measurements of received signal strength were taken in urban, suburban, and rural areas and compared to the COST 231 Hata model, Stanford University Interim model, and ECC-33 model. The COST 231 Hata model gave better predictions but with high error values outside acceptable ranges. The COST 231 Hata model was then adjusted using a linear least squares algorithm based on the field measurements. The adjusted COST 231 Hata model provided better predictions with minimum error within acceptable values and can accurately predict radio characteristics in Rivers State.
Overview of signal integrity simulation for sfp+ interface serial links with ...Conference Papers
The document discusses signal integrity simulation for high-speed SFP+ serial links. It begins with an overview of the challenges of high-speed transmission and the need for simulation. It then covers:
1) The IBIS-AMI model structure and configuration options for simulating transmitters and receivers.
2) The simulation setup created in ADS to optimize equalization settings for a specific SFP+ interface design.
3) The results of simulations at 10.3125Gbps and 16Gbps, showing larger eye openings at the lower data rate.
4) Additional transmitter simulation results, indicating better eye openings when optimizing de-emphasis levels and voltage amplitudes.
International Journal of Engineering and Science Invention (IJESI)inventionjournals
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.
This document discusses green communication and summarizes several research papers on the topic. It outlines the objectives of green communication as protecting the environment from harmful EM radiation, reducing greenhouse gases, and reducing wireless network operational costs. It then summarizes several papers on topics like power control, resource allocation, power allocation, and massive MIMO. The document also discusses energy consumption in the ICT industry, wireless resource trading challenges, and open research areas in green communication like massive MIMO and cooperative communication. It presents two case studies analyzing the energy efficiency of massive MIMO systems with considerations for aspects like channel gain, number of antennas, and transceiver power consumption.
Implementation of Particle Swarm Optimization Technique for Enhanced Outdoor ...Onyebuchi nosiri
This paper describes the development of optimized model for urban outdoor coverage in Long Term Evolution (LTE) network at 2300 MHz frequency band in Port Harcourt urban region, Nigeria. Signal attenuation and fluctuation remain amongst the major channel impairments for mobile radio communication systems. This arises as a result of model incompatibility with terrain and Line of Sight (LOS) obstruction of the channel signals. Some path loss models such as OkumuraHata, COST 231, Ericsson 999, Egli and ECC-33 models were evaluated for suitability and compared with the modified model for the environments. The models were based on data collected from LTE base stations at three geographical locations in Port Harcourt namely- Rumuokoro, Eneka and Ikwerre roads respectively. The simulation was implemented using MATLAB R2014a software. The modified model was further optimized with some selected parameters such as Root Mean Square Error (RMSE) and Mean Absolute Error (MAE) using Particle Swarm Optimization (PSO) technique. The results obtained gave rise to 3.030dB for RMSE and 0.00162dB for MAE respectively. The results obtained from the PSO optimized model demonstrated a better performance which is suitable for cell coverage planning and smooth handoff processes.
A new look on CSI imperfection in downlink NOMA systemsjournalBEEI
- The document analyzes the performance of downlink non-orthogonal multiple access (NOMA) systems under imperfect channel state information (CSI) and Nakagami-m fading.
- It derives closed-form expressions for the outage probability of two users in such NOMA systems considering the joint impact of imperfect CSI and Nakagami-m fading.
- Monte Carlo simulations are conducted to verify the accuracy of the analytical outage probability expressions derived for the two users under the system and channel models considered.
This document provides a synopsis for implementing Single Carrier Frequency Division Multiple Access (SC-FDMA) and Orthogonal Frequency Division Multiple Access (OFDMA) in MATLAB. The objectives are to implement the physical layer of Long Term Evolution (LTE) using SC-FDMA and OFDMA and investigate efficiency in terms of peak-to-average power ratio and bit error rate. SC-FDMA is used for uplink and OFDMA is used for downlink in LTE. Simulation results from implementing the techniques in MATLAB will evaluate efficiency based on modulation order, bit error rate, and signal-to-noise ratio. The document outlines related work, expected results, and conclusions regarding LTE physical layer
Improving of Energy Efficiency in LTE based MIMO-OFDM systems with Multiuser ...IRJET Journal
1) The document proposes a traffic-based resource and energy allocation algorithm to improve energy efficiency in LTE networks using MIMO and OFDMA technologies.
2) It analyzes existing resource allocation schemes that focus on energy efficiency but do not guarantee quality of service (QoS) for users, especially in high traffic load scenarios.
3) The proposed algorithm aims to minimize energy consumption at base stations while satisfying certain QoS requirements for users, even with high traffic loads, by allocating resources across multiple carrier components.
Design and analysis of microstrip antenna with zig-zag feeder for wireless co...journalBEEI
This document describes the design and analysis of a microstrip antenna with a zig-zag feeder for wireless communication applications. The proposed antenna is designed to have a wide bandwidth of 2-14 GHz. It consists of a zig-zag microstrip feedline connected to a tuning stub printed on one side of a substrate. On the other side of the substrate is a ground plane with zig-zag slots. Parametric analysis was performed to optimize the dimensions for wide bandwidth and acceptable gain between 7.448-5.928 dB. The zig-zag feedline and tuning stub with elliptical slots help improve the impedance matching for wide bandwidth operation suitable for UWB applications. Simulation results for radiation patterns, current distribution, and
The document analyzes the performance of vector antenna arrays compared to uniform linear arrays for code division multiple access (CDMA) signals in a multipath fading channel. It considers a closed loop power control system for a beamformer-RAKE receiver for a wireless CDMA system with multiple users. Both theoretical analysis and simulations show that vector antennas, which can detect six independent components of the electromagnetic field, can better exploit multipath diversity and significantly improve bit error rate performance over uniform linear arrays in frequency selective rich multipath channels. The vector antennas provide additional diversity to combat signal fading and improve interference suppression for multiple users.
IRJET- Statistical Tuning of Hata Model for 3G Communication Networks at 1.85...IRJET Journal
This document summarizes a study that statistically tunes the Hata propagation model for 3G networks at 1.857GHz in Port Harcourt, Nigeria. Drive tests were conducted at three urban sites to collect field measurements of path loss. The measured data was compared to predictions from standard models including Hata, COST 231, and LEE. Hata was identified as the best fitting standard model. To improve accuracy, Hata's parameters were statistically optimized using linear regression on the measured data. The optimized Hata model reduced mean absolute percentage error from 15.0% to 13.35% compared to the standard Hata model, demonstrating its improved path loss prediction for the environment.
Coded OFDM in Fiber-Optics Communication Systems with Optimum biasing of LaserCSCJournals
Abstract----A novel high spectral efficiency all-optical sampling orthogonal frequency-division multiplexing scheme is proposed using space frequency Block coding (SFBC) techniques and nonlinear behavior of vertical-cavity surface-emitting laser diodes is exploited by relative intensity to noise (RIN).We show that in long-haul fiber optics communications, SFBC-coded OFDM increases spectral efficiency and reduces the influence of chromatic dispersion in optical-OFDM system if RIN is adjusted to -155 dB/Hz
Gain Flatness and Noise Figure Optimization of C-Band EDFA in 16-channels WDM...Yayah Zakaria
In this paper, Gain Flatness and Noise Figure of Erbium Doped Fiber Amplifier (EDFA) have been investigated in 16-channels Wavelength Division Multiplexing (WDM). Fiber Bragg Grating (FBG) is used in C-band with the aim to achieve flat EDFA output gain. The proposed model has been studied in detail to evaluate and to enhance the performance of the transmission system in terms of gain, noise figure and eye diagram of the
received signals. To that end, various design parameters have been investigated and optimized, such as frequency spacing, EDF length and temperature. To enhance the transmission system performance in terms of gain flatness, the Gain Flattening Filter (GFF) has been introduced in the design. To prove the efficiency of the new design, the optical transmission
system with optimized design parameters has been compared with a previous works in the literature. The simulation results show satisfactory performance with quasi-equalized gain for each channel of the WDM transmission system.
Gain Flatness and Noise Figure Optimization of C-Band EDFAin 16-channels WDM ...IJECEIAES
In this paper, Gain Flatness and Noise Figure of Erbium Doped Fiber Amplifier (EDFA) have been investigated in 16-channels Wavelength Division Multiplexing (WDM). Fiber Bragg Grating (FBG) is used in C-band with the aim to achieve flat EDFA output gain. The proposed model has been studied in detail to evaluate and to enhance the performance of the transmission system in terms of gain, noise figure and eye diagram of the received signals. To that end, various design parameters have been investigated and optimized, such as frequency spacing, EDF length and temperature. To enhance the transmission system performance in terms of gain flatness, the Gain Flattening Filter (GFF) has been introduced in the design. To prove the efficiency of the new design, the optical transmission system with optimized design parameters has been compared with a previous works in the literature. The simulation results show satisfactory performance with quasi-equalized gain for each channel of the WDM transmission system.
Performance evaluation of path loss parameters for broadcasting applicationseSAT Publishing House
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
Design of wideband dielectric resonator antenna with square slots excited usi...Conference Papers
The document describes the design of a wideband dielectric resonator antenna (DRA) with square slots for 5G communication applications operating at 26 GHz. Square slots of two different sizes are introduced in the DRA to reduce its quality factor and achieve a bandwidth of 3 GHz (11.5%) from 25-28 GHz. The DRA is excited using a microstrip feed line. Simulation results show the proposed antenna achieves a peak gain of 4.8 dBi and radiation efficiency of 93%. Compared to reference DRAs, the proposed antenna with slots provides the widest bandwidth for 5G millimeter-wave applications.
The presentation is about Adaptive Beamforming for high data-rate applications. Analog beamforming, which is considered a cost effective solution for consumer devices are investigated. Two adaptive analog beamforming algorithms, i.e., a well-known perturbation-based and dmr-based which overcomes the drawbacks of perturbation-based algorithm are discussed in-detail and their performance comparisons are made with the help of computer simulations. Also variation of single-port structure is considered and it's benefits are exploited with the help of modified analog beamforming algorithms.
Enabling full-duplex in multiple access technique for 5G wireless networks ov...TELKOMNIKA JOURNAL
This document analyzes the performance of a two-user non-orthogonal multiple access (NOMA) network where one user is served directly by the base station and the other is served via an unmanned aerial vehicle (UAV) relay operating in full-duplex mode. It derives the exact outage probabilities of the two users under Rician fading channels. The analysis provides guidelines for designing UAV-enabled wireless networks using NOMA techniques. Key results include the outage probabilities accounting for interference at both the UAV relay and users under different self-interference conditions at the relay.
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.
Pulse shaping methods for inter carrier interference reduction in OFDM systemTELKOMNIKA JOURNAL
The weakness of the orthogonal freuency division multiplexing (OFDM) system is susceptible to the existence of carrier frequency offset (CFO) which causes the emergence of inter carrier interference (ICI) which causes a degradation of performance OFDM systems. This study aims to apply the suggested rectangular (REC) pulse and improved sinc-power (ISP) pulse shaping methods on OFDM system and determines ICI reduction with the effects of CFO over flat fading Rayleigh channels. The performance of each pulse shaping method is evaluated and compared based on parameter ICI power vs. normalized frequency offset, signal to interference ratio (SIR) vs. normalized frequency offset and bit error rate (BER) vs. energy bit per noise (Eb/No). The simulation result in terms of BER vs. Eb/No indicated that REC and ISP pulse shaping has better performance dealing with ICI reduction compared to OFDM system no applied pulse shaping. In addition, the ISP is able to mitigate ICI better than REC.
IRJET- Optimizing Different Parameters of Inter-Satellite Optical Wireless Co...IRJET Journal
This document discusses optimizing an inter-satellite optical wireless communication (IS-OWC) system by incorporating a Mach Zehnder interferometer (MZI) with duobinary modulation. The system is designed to transmit data rates up to 100 Gbps over distances of up to 8,000 km. The performance is analyzed by varying parameters like antenna aperture size, transmit power, data rate, and pointing error. Results show that larger aperture sizes, higher powers, and lower data rates and pointing errors improve quality as measured by Q-factor. Incorporating an MZI filter helps remove unwanted signals and enhance performance compared to a simple duobinary system.
Adjustment of Cost 231 Hata Path Model For Cellular Transmission in Rivers StateIOSR Journals
The document presents an adjustment of the COST 231 Hata path loss model for predicting radio signal propagation in Rivers State, Nigeria. Field measurements of received signal strength were taken in urban, suburban, and rural areas and compared to the COST 231 Hata model, Stanford University Interim model, and ECC-33 model. The COST 231 Hata model gave better predictions but with high error values outside acceptable ranges. The COST 231 Hata model was then adjusted using a linear least squares algorithm based on the field measurements. The adjusted COST 231 Hata model provided better predictions with minimum error within acceptable values and can accurately predict radio characteristics in Rivers State.
Overview of signal integrity simulation for sfp+ interface serial links with ...Conference Papers
The document discusses signal integrity simulation for high-speed SFP+ serial links. It begins with an overview of the challenges of high-speed transmission and the need for simulation. It then covers:
1) The IBIS-AMI model structure and configuration options for simulating transmitters and receivers.
2) The simulation setup created in ADS to optimize equalization settings for a specific SFP+ interface design.
3) The results of simulations at 10.3125Gbps and 16Gbps, showing larger eye openings at the lower data rate.
4) Additional transmitter simulation results, indicating better eye openings when optimizing de-emphasis levels and voltage amplitudes.
International Journal of Engineering and Science Invention (IJESI)inventionjournals
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.
This document discusses green communication and summarizes several research papers on the topic. It outlines the objectives of green communication as protecting the environment from harmful EM radiation, reducing greenhouse gases, and reducing wireless network operational costs. It then summarizes several papers on topics like power control, resource allocation, power allocation, and massive MIMO. The document also discusses energy consumption in the ICT industry, wireless resource trading challenges, and open research areas in green communication like massive MIMO and cooperative communication. It presents two case studies analyzing the energy efficiency of massive MIMO systems with considerations for aspects like channel gain, number of antennas, and transceiver power consumption.
Implementation of Particle Swarm Optimization Technique for Enhanced Outdoor ...Onyebuchi nosiri
This paper describes the development of optimized model for urban outdoor coverage in Long Term Evolution (LTE) network at 2300 MHz frequency band in Port Harcourt urban region, Nigeria. Signal attenuation and fluctuation remain amongst the major channel impairments for mobile radio communication systems. This arises as a result of model incompatibility with terrain and Line of Sight (LOS) obstruction of the channel signals. Some path loss models such as OkumuraHata, COST 231, Ericsson 999, Egli and ECC-33 models were evaluated for suitability and compared with the modified model for the environments. The models were based on data collected from LTE base stations at three geographical locations in Port Harcourt namely- Rumuokoro, Eneka and Ikwerre roads respectively. The simulation was implemented using MATLAB R2014a software. The modified model was further optimized with some selected parameters such as Root Mean Square Error (RMSE) and Mean Absolute Error (MAE) using Particle Swarm Optimization (PSO) technique. The results obtained gave rise to 3.030dB for RMSE and 0.00162dB for MAE respectively. The results obtained from the PSO optimized model demonstrated a better performance which is suitable for cell coverage planning and smooth handoff processes.
A new look on CSI imperfection in downlink NOMA systemsjournalBEEI
- The document analyzes the performance of downlink non-orthogonal multiple access (NOMA) systems under imperfect channel state information (CSI) and Nakagami-m fading.
- It derives closed-form expressions for the outage probability of two users in such NOMA systems considering the joint impact of imperfect CSI and Nakagami-m fading.
- Monte Carlo simulations are conducted to verify the accuracy of the analytical outage probability expressions derived for the two users under the system and channel models considered.
This document provides a synopsis for implementing Single Carrier Frequency Division Multiple Access (SC-FDMA) and Orthogonal Frequency Division Multiple Access (OFDMA) in MATLAB. The objectives are to implement the physical layer of Long Term Evolution (LTE) using SC-FDMA and OFDMA and investigate efficiency in terms of peak-to-average power ratio and bit error rate. SC-FDMA is used for uplink and OFDMA is used for downlink in LTE. Simulation results from implementing the techniques in MATLAB will evaluate efficiency based on modulation order, bit error rate, and signal-to-noise ratio. The document outlines related work, expected results, and conclusions regarding LTE physical layer
Improving of Energy Efficiency in LTE based MIMO-OFDM systems with Multiuser ...IRJET Journal
1) The document proposes a traffic-based resource and energy allocation algorithm to improve energy efficiency in LTE networks using MIMO and OFDMA technologies.
2) It analyzes existing resource allocation schemes that focus on energy efficiency but do not guarantee quality of service (QoS) for users, especially in high traffic load scenarios.
3) The proposed algorithm aims to minimize energy consumption at base stations while satisfying certain QoS requirements for users, even with high traffic loads, by allocating resources across multiple carrier components.
Design and analysis of microstrip antenna with zig-zag feeder for wireless co...journalBEEI
This document describes the design and analysis of a microstrip antenna with a zig-zag feeder for wireless communication applications. The proposed antenna is designed to have a wide bandwidth of 2-14 GHz. It consists of a zig-zag microstrip feedline connected to a tuning stub printed on one side of a substrate. On the other side of the substrate is a ground plane with zig-zag slots. Parametric analysis was performed to optimize the dimensions for wide bandwidth and acceptable gain between 7.448-5.928 dB. The zig-zag feedline and tuning stub with elliptical slots help improve the impedance matching for wide bandwidth operation suitable for UWB applications. Simulation results for radiation patterns, current distribution, and
The document analyzes the performance of vector antenna arrays compared to uniform linear arrays for code division multiple access (CDMA) signals in a multipath fading channel. It considers a closed loop power control system for a beamformer-RAKE receiver for a wireless CDMA system with multiple users. Both theoretical analysis and simulations show that vector antennas, which can detect six independent components of the electromagnetic field, can better exploit multipath diversity and significantly improve bit error rate performance over uniform linear arrays in frequency selective rich multipath channels. The vector antennas provide additional diversity to combat signal fading and improve interference suppression for multiple users.
IRJET- Statistical Tuning of Hata Model for 3G Communication Networks at 1.85...IRJET Journal
This document summarizes a study that statistically tunes the Hata propagation model for 3G networks at 1.857GHz in Port Harcourt, Nigeria. Drive tests were conducted at three urban sites to collect field measurements of path loss. The measured data was compared to predictions from standard models including Hata, COST 231, and LEE. Hata was identified as the best fitting standard model. To improve accuracy, Hata's parameters were statistically optimized using linear regression on the measured data. The optimized Hata model reduced mean absolute percentage error from 15.0% to 13.35% compared to the standard Hata model, demonstrating its improved path loss prediction for the environment.
Coded OFDM in Fiber-Optics Communication Systems with Optimum biasing of LaserCSCJournals
Abstract----A novel high spectral efficiency all-optical sampling orthogonal frequency-division multiplexing scheme is proposed using space frequency Block coding (SFBC) techniques and nonlinear behavior of vertical-cavity surface-emitting laser diodes is exploited by relative intensity to noise (RIN).We show that in long-haul fiber optics communications, SFBC-coded OFDM increases spectral efficiency and reduces the influence of chromatic dispersion in optical-OFDM system if RIN is adjusted to -155 dB/Hz
Gain Flatness and Noise Figure Optimization of C-Band EDFA in 16-channels WDM...Yayah Zakaria
In this paper, Gain Flatness and Noise Figure of Erbium Doped Fiber Amplifier (EDFA) have been investigated in 16-channels Wavelength Division Multiplexing (WDM). Fiber Bragg Grating (FBG) is used in C-band with the aim to achieve flat EDFA output gain. The proposed model has been studied in detail to evaluate and to enhance the performance of the transmission system in terms of gain, noise figure and eye diagram of the
received signals. To that end, various design parameters have been investigated and optimized, such as frequency spacing, EDF length and temperature. To enhance the transmission system performance in terms of gain flatness, the Gain Flattening Filter (GFF) has been introduced in the design. To prove the efficiency of the new design, the optical transmission
system with optimized design parameters has been compared with a previous works in the literature. The simulation results show satisfactory performance with quasi-equalized gain for each channel of the WDM transmission system.
Gain Flatness and Noise Figure Optimization of C-Band EDFAin 16-channels WDM ...IJECEIAES
In this paper, Gain Flatness and Noise Figure of Erbium Doped Fiber Amplifier (EDFA) have been investigated in 16-channels Wavelength Division Multiplexing (WDM). Fiber Bragg Grating (FBG) is used in C-band with the aim to achieve flat EDFA output gain. The proposed model has been studied in detail to evaluate and to enhance the performance of the transmission system in terms of gain, noise figure and eye diagram of the received signals. To that end, various design parameters have been investigated and optimized, such as frequency spacing, EDF length and temperature. To enhance the transmission system performance in terms of gain flatness, the Gain Flattening Filter (GFF) has been introduced in the design. To prove the efficiency of the new design, the optical transmission system with optimized design parameters has been compared with a previous works in the literature. The simulation results show satisfactory performance with quasi-equalized gain for each channel of the WDM transmission system.
The document evaluates the performance of single and hybrid optical amplifiers for a 160x10 Gbps dense wavelength division multiplexing (DWDM) system over different transmission distances ranging from 40 to 240 km. It simulates and compares the gain, output power, bit error rate, eye height, and Q-factor of different amplifier configurations including erbium-doped fiber amplifier (EDFA), semiconductor optical amplifier (SOA), Raman amplifier, and their hybrid combinations. The results show that the SOA-Raman-EDFA hybrid amplifier configuration provides the highest gain (53.06 to 50.84 dB), highest output power (39.91 to 37.7 dBm), lowest bit error rate (-37.66
Performance evaluation of 4-quadrature amplitude modulation over orthogonal ...IJECEIAES
Orthogonal frequency division multiplexing (OFDM) is a multicarrier modulation (MCM) technique that divides the wide bandwidth into parallel narrow bands, each of which is modulated by orthogonal subcarriers. Currently, OFDM is a high-spectral efficiency modulation technique that is used in a variety of wired and wireless applications. The transmitted signal in a wireless communication channel spreads from transmitter to receiver through multiple reflective paths. This triggers multipath fading, which causes variations in the received signal's amplitude and phase. Slow/fast and frequency-selective/frequency-nonselective are the main types of multipath fading channels. Therefore, in this paper, we proposed new models for modeling multipath fading channels, such as the exponential fading channel and the Gamma fading channel. In addition, new bit-error-rate (BER) derivations have been derived. The performance of the OFDM system over proposed channel models has been evaluated using Monte-Carlo simulation and compared to the Rayleigh fading channel model. The obtained results via simulations show that the exponential fading channel at a rate parameter (λ=0.5) outperforms the Rayleigh fading channel by 6 dB for all values of Eb/No, while the Gamma fading channel at (α=2) outperforms the Rayleigh fading channel by 3 dB for all values of Eb/No.
In this work, high-speed transmission over the long-haul optical channel using orthogonal frequency division multiplexing (OFDM) was investigated. Furthermore, we recommend mixing polarization division multiplexing (PDM) with coherent OFDM (CO-OFDM) and quadrature amplitude modulation (16-QAM) to improve spectral efficiency (SE) while transmitting over a wavelength division multiplexing (WDM) system.
An 800 Gb/s WDM PDM-CO-OFDM-16QAM transmission system with various channel spacing of 100 GHz, 50 GHz, and 25 GHz is examined utilizing the OptiSystem (2021) version 18.0 software package over ten spans of 60 km standard single-mode fiber (SSMF). Different channel spacing WDM systems have been compared in terms of performance and SE. The results reveal that the WDM system with 100 GHz channel spacing has a longer transmission range and needs minimal optical signal to noise ratio (OSNR) at the reception. The 25 GHz channel spacing WDM system exceeds the others in terms of SE. Further, the effect of ultra-low loss and large effective area fiber in lowering span loss and nonlinear effects for
25 GHz channel spacing WDM system is investigated. The findings show that the system performance with the new fiber outperforms the SSMF.
The acceptable bit error rate (BER) for this study is 0.033 (20% concatenated forward error correction (FEC) threshold).
1. The document describes the design and analysis of a dynamic Erbium Doped Fiber Amplifier (EDFA) simulator using MATLAB.
2. The simulator is based on a one-dimensional nonlinear differential equation that describes the time-dependent population density. It uses MATLAB blocks to simulate gain flattening of multiplexed channels at different wavelengths.
3. The performance of the EDFA simulator is analyzed in both the C-band and L-band, including calculations of noise figure for different signal wavelengths based on a designed amplified spontaneous emission noise generator.
Optimum Location of EDFA based on Eye Diagram, Q-factor and Bit Error Rate Me...IOSRJECE
This document analyzes the optimum location of an Erbium Doped Fiber Amplifier (EDFA) in an optical transmission system based on bit error rate (BER), Q-factor, and eye diagram metrics. The study uses Optisystem simulation software to model an optical system with an EDFA placed at different distances from the transmitter. Simulation results show that placing the EDFA at 100km from the transmitter produces the lowest BER, highest Q-factor, and largest eye opening, indicating it is the optimum location out of the distances tested in the 200km system. In conclusion, properly placing an EDFA can improve the performance of long-haul optical systems.
Iaetsd adaptive modulation in mimo ofdm system for4 gIaetsd Iaetsd
This paper proposes applying hybrid adaptation techniques in MIMO OFDM systems to improve spectral efficiency and reduce transmit power. It first analyzes the bit error rate of M-QAM modulation in OFDM systems with different numbers of subcarriers. Channel estimation is performed using MMSE, which estimates the channel with less error than LS. Feedback from channel estimation is then used with hybrid adaptation techniques. Simulation results show MMSE has lower MSE and symbol errors than LS estimation.
Optimum Location of EDFA based on Eye Diagram, Q-factor and Bit Error Rate Me...IOSRJECE
This work investigated the optimum location of Erbium Doped Fiber Amplifier (EDFA) in an optical system based on analysis of BER analyzer metrics by simulation approach using Optisystem software. The simulation model will be studied based on many parameters as input power (dBm), gain of Amplifier (dBm), fiber cable length (km) and attenuation coefficient (dB/km), there are two different parameters will be analyzed at five different locations of EDFA which are Q-Factor and Bit Error Rate (BER) and also Eye Diagram, which Q-factor and BER are measurement parameters used to measure the quality of received signal at receiver.
Power Transient Response of EDFA as a function of Wavelength in the scenario ...ijsrd.com
In this paper power transient is investigated as function of add/drop wavelength and surviving channel wavelength. We have reported that power excursions varies with different wavelength allocations of the add/drop channels. Transient response is reduced by 73.39% in case when add/drop channels are taken in L band instead of C band. Also power transient response is calculated as a function of wavelengths of surviving channel. It has been observed that at higher wavelengths power excursions are less than at shorter wavelengths of C band.
Design of a two stage differential low noise amplifier for uwb applicationsIAEME Publication
This document describes the design of a two-stage differential low noise amplifier (LNA) for ultra-wideband applications. The first stage uses resistive current reuse and dual inductive degeneration to achieve wideband input matching. The second stage is a common source amplifier with inductive peaking to provide flat power gain. Simulation results show the LNA achieves a maximum power gain of 20.3 dB, noise figure between 2.8-4.5 dB, reverse isolation below -45 dB, and IIP3 of -3.76 dBm, demonstrating good performance for UWB applications.
Estimation of bit error rate in 2×2 and 4×4 multi-input multioutput-orthogon...IJECEIAES
Multiple-input, multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) systems with multiple input antennas and multiple output antennas in dynamic environments face the challenge of channel estimation. To overcome this challenge and to improve the performance and signal-tonoise ratio, in this paper we used the Kalman filter for the correct estimation of the signal in dynamic environments. To obtain the original signal at the receiver end bit error rate factor plays a major role. If the signal to noise ratio is high and the bit error rate is low then signal strength is high, the signal received at the receiver end is almost similar to the i th transmitted signal. The dynamic tracking characteristic of Kalman filter is used to establish a dynamic space-time codeword and a collection of orthogonal pilot sequences to prevent interference among transmissions in this paper. Using the simulation, the Kalman filter method can be compared to the other channel estimation method presented in this paper that can track timevarying channels rapidly.
Challenging Issues in Inter-Satellite Optical Wireless Systems (IsOWC) and it...idescitation
Inter-satellite optical wireless communication
system (IsOWC), one of the important applications of FSO
(Free Space Optics) technology, will be deployed in space in
the near future because of providing power efficient and high
bandwidth allocation facilities unlike present microwave
satellite systems. In this paper, we have deliberated a
presentation of different challenging issues in achieving a
prolonged inter satellite link for an IsOWC system under
different situations and conditions. This work is also
emphasized on the suggested techniques to combat with the
degrading factors to put into practice of high speed IsOWC
system with minimum BER.
Performance analysis of adaptive filter channel estimated MIMO OFDM communica...IJECEIAES
Advanced Communication Systems are wideband systems to support multiple applications such as audio, video and data so and so forth. These systems require high spectral efficiency and data rates. In addition, they should provide multipath fading and inter-symbol interference (ISI) free transmission. Multiple input multiple output orthogonal frequency division multiplexing (MIMO OFDM) meets these requirements Hence, MIMOOFDM is the most preferable technique for long term evaluation advanced (LTEA). The primary objective of this paper is to control bit error rate (BER) by proper channel coding, pilot carriers, adaptive filter channel estimation schemes and space time coding (STC). A combination of any of these schemes results in better BER performance over individual schemes. System performance is analyzed for various digital modulation schemes. In this paper, adaptive filter channel estimated MIMO OFDM system is proposed by integrating channel coding, adaptive filter channel estimation, digital modulation and space time coding. From the simulation results, channel estimated 2×2 MIMO OFDM system shows superior performance over individual schemes.
analysis on design and implementation of 4×10 gb s wdm tdm pon with disparate...INFOGAIN PUBLICATION
This document summarizes a research paper that analyzed the design and implementation of a 4×10 Gb/s WDM-TDM passive optical network (PON) with different receiver photodiodes. The PON was tested over varying link distances from 40km to 100km using 4 wavelengths to support a maximum of 32 users. Bit error rate (BER) and Q-factor were analyzed and found to decrease with increased distance. BER values were lower for an avalanche photodiode (APD) receiver compared to a PIN receiver. The optimal BER was obtained at 97km for APD and 96km for PIN receivers. Graphs showed BER decreased and Q-factor decreased with increased distance for
Improved Ad-Hoc Networks Using Cooperative DiversityIJCSIT Journal
In this paper an ad-hoc network having source, a
destination and a third station which is a relay is analyzed.
The channels used here are modeled having thermal noise,
Rayleigh fading and path loss. Different methods for
combining and diversity protocols are compared.
Reduction of Four-Wave Mixing in DWDM System using Electro-Optic Phase Modula...IJECEIAES
In this paper, electro-optic phase modulator (EOPM) is used to reduce the effect of four-wave mixing (FWM), which is placed after 64 DWDMchannels multiplexer. It was found that the FWM is very sensitive to the phase deviation of the EOPM, and it can be reduced by introducing a phase shift between pulses. The simulation results confirmed the ability of the EOPM in improving the system performanceas indicated by the bit error rates. In term of comparison, the system of 64 channels based intensity modulated/ direct detection (IM/DD) transmission achieved bit error rate of 10 over 30 km and 70km without and with EOPM, respectively. -26
Performance evaluation of high mobility OFDM channel estimation techniques IJECEIAES
In wireless communication, Orthogonal Frequency Division Multiplexing (OFDM) has been adopted due to its robustness to multipath fading and high data rate transmissions. At the other hand, the performance of OFDM systems severely degraded due to multi-path fading and Doppler frequency shifts in mobile systems, which causes inter-carrier-interference (ICI). Thus, Estimation of channel parameters is required at the receiver using a pre designed estimator where pilot tones are inserted in each OFDM symbol. In this paper, a random pilot data are generated and inserted in each OFDM symbol at equally spaced locations. The performance test of Least Square (LS) and Linear Minimum Mean Square (LMMSE) estimation methods are proposed with Discrete Fourier Transform (DFT) based on both LS and LMMSE, where different ITU channel models are considered in order to compare their performance for data transmission in high mobile systems with different Doppler frequencies exceeds 200 Hz and minimal number of pilots.
Optical networks have evolved over generations to transmit digital signals using pulses of light through optical fibers. First generation networks converted signals between optical and electrical domains at nodes, resulting in complexity and costs. Second generation networks used wavelength division multiplexing to increase bandwidth and incorporated some optical switching. The rake receiver is a technique used to combat multipath fading in wireless networks by using multiple correlators and delays to separately detect the strongest multipath components and then combine them coherently.
Similar to Comparative performance of optical amplifiers: Raman and EDFA (20)
Amazon products reviews classification based on machine learning, deep learni...TELKOMNIKA JOURNAL
In recent times, the trend of online shopping through e-commerce stores and websites has grown to a huge extent. Whenever a product is purchased on an e-commerce platform, people leave their reviews about the product. These reviews are very helpful for the store owners and the product’s manufacturers for the betterment of their work process as well as product quality. An automated system is proposed in this work that operates on two datasets D1 and D2 obtained from Amazon. After certain preprocessing steps, N-gram and word embedding-based features are extracted using term frequency-inverse document frequency (TF-IDF), bag of words (BoW) and global vectors (GloVe), and Word2vec, respectively. Four machine learning (ML) models support vector machines (SVM), logistic regression (RF), logistic regression (LR), multinomial Naïve Bayes (MNB), two deep learning (DL) models convolutional neural network (CNN), long-short term memory (LSTM), and standalone bidirectional encoder representations (BERT) are used to classify reviews as either positive or negative. The results obtained by the standard ML, DL models and BERT are evaluated using certain performance evaluation measures. BERT turns out to be the best-performing model in the case of D1 with an accuracy of 90% on features derived by word embedding models while the CNN provides the best accuracy of 97% upon word embedding features in the case of D2. The proposed model shows better overall performance on D2 as compared to D1.
Design, simulation, and analysis of microstrip patch antenna for wireless app...TELKOMNIKA JOURNAL
In this study, a microstrip patch antenna that works at 3.6 GHz was built and tested to see how well it works. In this work, Rogers RT/Duroid 5880 has been used as the substrate material, with a dielectric permittivity of 2.2 and a thickness of 0.3451 mm; it serves as the base for the examined antenna. The computer simulation technology (CST) studio suite is utilized to show the recommended antenna design. The goal of this study was to get a more extensive transmission capacity, a lower voltage standing wave ratio (VSWR), and a lower return loss, but the main goal was to get a higher gain, directivity, and efficiency. After simulation, the return loss, gain, directivity, bandwidth, and efficiency of the supplied antenna are found to be -17.626 dB, 9.671 dBi, 9.924 dBi, 0.2 GHz, and 97.45%, respectively. Besides, the recreation uncovered that the transfer speed side-lobe level at phi was much better than those of the earlier works, at -28.8 dB, respectively. Thus, it makes a solid contender for remote innovation and more robust communication.
Design and simulation an optimal enhanced PI controller for congestion avoida...TELKOMNIKA JOURNAL
This document describes using a snake optimization algorithm to tune the gains of an enhanced proportional-integral controller for congestion avoidance in a TCP/AQM system. The controller aims to maintain a stable and desired queue size without noise or transmission problems. A linearized model of the TCP/AQM system is presented. An enhanced PI controller combining nonlinear gain and original PI gains is proposed. The snake optimization algorithm is then used to tune the parameters of the enhanced PI controller to achieve optimal system performance and response. Simulation results are discussed showing the proposed controller provides a stable and robust behavior for congestion control.
Improving the detection of intrusion in vehicular ad-hoc networks with modifi...TELKOMNIKA JOURNAL
Vehicular ad-hoc networks (VANETs) are wireless-equipped vehicles that form networks along the road. The security of this network has been a major challenge. The identity-based cryptosystem (IBC) previously used to secure the networks suffers from membership authentication security features. This paper focuses on improving the detection of intruders in VANETs with a modified identity-based cryptosystem (MIBC). The MIBC is developed using a non-singular elliptic curve with Lagrange interpolation. The public key of vehicles and roadside units on the network are derived from number plates and location identification numbers, respectively. Pseudo-identities are used to mask the real identity of users to preserve their privacy. The membership authentication mechanism ensures that only valid and authenticated members of the network are allowed to join the network. The performance of the MIBC is evaluated using intrusion detection ratio (IDR) and computation time (CT) and then validated with the existing IBC. The result obtained shows that the MIBC recorded an IDR of 99.3% against 94.3% obtained for the existing identity-based cryptosystem (EIBC) for 140 unregistered vehicles attempting to intrude on the network. The MIBC shows lower CT values of 1.17 ms against 1.70 ms for EIBC. The MIBC can be used to improve the security of VANETs.
Conceptual model of internet banking adoption with perceived risk and trust f...TELKOMNIKA JOURNAL
Understanding the primary factors of internet banking (IB) acceptance is critical for both banks and users; nevertheless, our knowledge of the role of users’ perceived risk and trust in IB adoption is limited. As a result, we develop a conceptual model by incorporating perceived risk and trust into the technology acceptance model (TAM) theory toward the IB. The proper research emphasized that the most essential component in explaining IB adoption behavior is behavioral intention to use IB adoption. TAM is helpful for figuring out how elements that affect IB adoption are connected to one another. According to previous literature on IB and the use of such technology in Iraq, one has to choose a theoretical foundation that may justify the acceptance of IB from the customer’s perspective. The conceptual model was therefore constructed using the TAM as a foundation. Furthermore, perceived risk and trust were added to the TAM dimensions as external factors. The key objective of this work was to extend the TAM to construct a conceptual model for IB adoption and to get sufficient theoretical support from the existing literature for the essential elements and their relationships in order to unearth new insights about factors responsible for IB adoption.
Efficient combined fuzzy logic and LMS algorithm for smart antennaTELKOMNIKA JOURNAL
The smart antennas are broadly used in wireless communication. The least mean square (LMS) algorithm is a procedure that is concerned in controlling the smart antenna pattern to accommodate specified requirements such as steering the beam toward the desired signal, in addition to placing the deep nulls in the direction of unwanted signals. The conventional LMS (C-LMS) has some drawbacks like slow convergence speed besides high steady state fluctuation error. To overcome these shortcomings, the present paper adopts an adaptive fuzzy control step size least mean square (FC-LMS) algorithm to adjust its step size. Computer simulation outcomes illustrate that the given model has fast convergence rate as well as low mean square error steady state.
Design and implementation of a LoRa-based system for warning of forest fireTELKOMNIKA JOURNAL
This paper presents the design and implementation of a forest fire monitoring and warning system based on long range (LoRa) technology, a novel ultra-low power consumption and long-range wireless communication technology for remote sensing applications. The proposed system includes a wireless sensor network that records environmental parameters such as temperature, humidity, wind speed, and carbon dioxide (CO2) concentration in the air, as well as taking infrared photos.The data collected at each sensor node will be transmitted to the gateway via LoRa wireless transmission. Data will be collected, processed, and uploaded to a cloud database at the gateway. An Android smartphone application that allows anyone to easily view the recorded data has been developed. When a fire is detected, the system will sound a siren and send a warning message to the responsible personnel, instructing them to take appropriate action. Experiments in Tram Chim Park, Vietnam, have been conducted to verify and evaluate the operation of the system.
Wavelet-based sensing technique in cognitive radio networkTELKOMNIKA JOURNAL
Cognitive radio is a smart radio that can change its transmitter parameter based on interaction with the environment in which it operates. The demand for frequency spectrum is growing due to a big data issue as many Internet of Things (IoT) devices are in the network. Based on previous research, most frequency spectrum was used, but some spectrums were not used, called spectrum hole. Energy detection is one of the spectrum sensing methods that has been frequently used since it is easy to use and does not require license users to have any prior signal understanding. But this technique is incapable of detecting at low signal-to-noise ratio (SNR) levels. Therefore, the wavelet-based sensing is proposed to overcome this issue and detect spectrum holes. The main objective of this work is to evaluate the performance of wavelet-based sensing and compare it with the energy detection technique. The findings show that the percentage of detection in wavelet-based sensing is 83% higher than energy detection performance. This result indicates that the wavelet-based sensing has higher precision in detection and the interference towards primary user can be decreased.
A novel compact dual-band bandstop filter with enhanced rejection bandsTELKOMNIKA JOURNAL
In this paper, we present the design of a new wide dual-band bandstop filter (DBBSF) using nonuniform transmission lines. The method used to design this filter is to replace conventional uniform transmission lines with nonuniform lines governed by a truncated Fourier series. Based on how impedances are profiled in the proposed DBBSF structure, the fractional bandwidths of the two 10 dB-down rejection bands are widened to 39.72% and 52.63%, respectively, and the physical size has been reduced compared to that of the filter with the uniform transmission lines. The results of the electromagnetic (EM) simulation support the obtained analytical response and show an improved frequency behavior.
Deep learning approach to DDoS attack with imbalanced data at the application...TELKOMNIKA JOURNAL
A distributed denial of service (DDoS) attack is where one or more computers attack or target a server computer, by flooding internet traffic to the server. As a result, the server cannot be accessed by legitimate users. A result of this attack causes enormous losses for a company because it can reduce the level of user trust, and reduce the company’s reputation to lose customers due to downtime. One of the services at the application layer that can be accessed by users is a web-based lightweight directory access protocol (LDAP) service that can provide safe and easy services to access directory applications. We used a deep learning approach to detect DDoS attacks on the CICDDoS 2019 dataset on a complex computer network at the application layer to get fast and accurate results for dealing with unbalanced data. Based on the results obtained, it is observed that DDoS attack detection using a deep learning approach on imbalanced data performs better when implemented using synthetic minority oversampling technique (SMOTE) method for binary classes. On the other hand, the proposed deep learning approach performs better for detecting DDoS attacks in multiclass when implemented using the adaptive synthetic (ADASYN) method.
The appearance of uncertainties and disturbances often effects the characteristics of either linear or nonlinear systems. Plus, the stabilization process may be deteriorated thus incurring a catastrophic effect to the system performance. As such, this manuscript addresses the concept of matching condition for the systems that are suffering from miss-match uncertainties and exogeneous disturbances. The perturbation towards the system at hand is assumed to be known and unbounded. To reach this outcome, uncertainties and their classifications are reviewed thoroughly. The structural matching condition is proposed and tabulated in the proposition 1. Two types of mathematical expressions are presented to distinguish the system with matched uncertainty and the system with miss-matched uncertainty. Lastly, two-dimensional numerical expressions are provided to practice the proposed proposition. The outcome shows that matching condition has the ability to change the system to a design-friendly model for asymptotic stabilization.
Implementation of FinFET technology based low power 4×4 Wallace tree multipli...TELKOMNIKA JOURNAL
Many systems, including digital signal processors, finite impulse response (FIR) filters, application-specific integrated circuits, and microprocessors, use multipliers. The demand for low power multipliers is gradually rising day by day in the current technological trend. In this study, we describe a 4×4 Wallace multiplier based on a carry select adder (CSA) that uses less power and has a better power delay product than existing multipliers. HSPICE tool at 16 nm technology is used to simulate the results. In comparison to the traditional CSA-based multiplier, which has a power consumption of 1.7 µW and power delay product (PDP) of 57.3 fJ, the results demonstrate that the Wallace multiplier design employing CSA with first zero finding logic (FZF) logic has the lowest power consumption of 1.4 µW and PDP of 27.5 fJ.
Evaluation of the weighted-overlap add model with massive MIMO in a 5G systemTELKOMNIKA JOURNAL
The flaw in 5G orthogonal frequency division multiplexing (OFDM) becomes apparent in high-speed situations. Because the doppler effect causes frequency shifts, the orthogonality of OFDM subcarriers is broken, lowering both their bit error rate (BER) and throughput output. As part of this research, we use a novel design that combines massive multiple input multiple output (MIMO) and weighted overlap and add (WOLA) to improve the performance of 5G systems. To determine which design is superior, throughput and BER are calculated for both the proposed design and OFDM. The results of the improved system show a massive improvement in performance ver the conventional system and significant improvements with massive MIMO, including the best throughput and BER. When compared to conventional systems, the improved system has a throughput that is around 22% higher and the best performance in terms of BER, but it still has around 25% less error than OFDM.
Reflector antenna design in different frequencies using frequency selective s...TELKOMNIKA JOURNAL
In this study, it is aimed to obtain two different asymmetric radiation patterns obtained from antennas in the shape of the cross-section of a parabolic reflector (fan blade type antennas) and antennas with cosecant-square radiation characteristics at two different frequencies from a single antenna. For this purpose, firstly, a fan blade type antenna design will be made, and then the reflective surface of this antenna will be completed to the shape of the reflective surface of the antenna with the cosecant-square radiation characteristic with the frequency selective surface designed to provide the characteristics suitable for the purpose. The frequency selective surface designed and it provides the perfect transmission as possible at 4 GHz operating frequency, while it will act as a band-quenching filter for electromagnetic waves at 5 GHz operating frequency and will be a reflective surface. Thanks to this frequency selective surface to be used as a reflective surface in the antenna, a fan blade type radiation characteristic at 4 GHz operating frequency will be obtained, while a cosecant-square radiation characteristic at 5 GHz operating frequency will be obtained.
Reagentless iron detection in water based on unclad fiber optical sensorTELKOMNIKA JOURNAL
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Comparative performance of optical amplifiers: Raman and EDFA
1. TELKOMNIKA Telecommunication, Computing, Electronics and Control
Vol. 18, No. 4, August 2020, pp. 1701~1707
ISSN: 1693-6930, accredited First Grade by Kemenristekdikti, Decree No: 21/E/KPT/2018
DOI: 10.12928/TELKOMNIKA.v18i4.15706 1701
Journal homepage: http://journal.uad.ac.id/index.php/TELKOMNIKA
Comparative performance of optical amplifiers:
Raman and EDFA
Khalis A. Mohammed, Basma M. K. Younis
Department of Computer Technology Engineering, Engineering Technical College, Northern Technical University, Iraq
Article Info ABSTRACT
Article history:
Received Jan 31, 2020
Revised Feb 28, 2020
Accepted Mar 18, 2020
The in-line optical signal amplification is often used in optical communication
systems to accomplish longer transmission distances and larger capacity.
In this proposed paper, the operation of two types of optical amplifiers
for 16×10 Gbps wavelength division multiplexing system had been examined
by changing transmission distance from 10 to 200 km with a dispersion equals
to 16.75 ps/nm/km. The analysis and design of such systems ordinarily
includes many signal channels, nonlinear devices, several topologies with
many noise sources, is extremely complex and effort-exhaustive. Therefore,
theoretical studies with simulation CAD software of systems are become
necessity to predict and optimize system performance. The comparison
between EDFA and Raman has already explored by many researchers in
varying ways in this work and to achieve obove objectives, the OptiSystem
software was used to design the proposed fiber optic communications system
and to simulate results. Performance for the present system was evaluated
for parameters like bit error rate (BER), quality factor (QF), total gain with eye
opening factor. It was saw that EDFA provides better results, in the maximal
transmission distance 64% better than Raman amplifier, 57.5%
for amplification gain and 26.7% for maximum quality factor. As a future
study a hybrid amplifier can produce better quality of amplification.
Keywords:
BER
EDFA
Eye opening
Quality factor
Raman
This is an open access article under the CC BY-SA license.
Corresponding Author:
Khalis A. Mohammed,
Department of Computer Technology Engineering, Engineering Technical College,
Northern Technical University, Mosul, Iraq.
Email: khalis_am@ntu.edu.iq or khalisbmk2004@gmail.com
1. INTRODUCTION
All over the world, the optical fiber communication systems are being widely used for transmitting
video and data transmission purposes. Fiber optics only will be able to converge the challenge for spread over
the universal telecommunication network make it remain to grow at an exponential speed. Optical amplifiers
are important elements in progressive fiber telecommunications networks. They offer the means to offset
the losses produced by the fiber transmission medium, the optical fiber basic elements placed in the broadcast
path and the power split at optical splitters. So these amplifiers ease the extraordinary global abilities,
long transmission durations and multipoint-to-multipoint connectivity necessary for act with increasing data
sizes [1]. A brief account of the collection of researches and previous works related with those used in this
work are listed below.
Article [2] shows that the semiconductor optical amplifiers have widely been adopted both
by the research community and the industrial sector as a principal technological platform for the realization
of a diverse range of applications with high performance. The optical amplifiers design models were
2. ISSN: 1693-6930
TELKOMNIKA Telecommun Comput El Control, Vol. 18, No. 4, August 2020: 1701 - 1707
1702
successfully designed and implemented into OptSim. The main motivation of the work in [3] is to optimize
the optical amplifiers for different dispersion and transmission distance. The performance of optical amplifiers
was evaluated using the eye patterns, BER measurement, eye opening and Q factor. The simulation results
show behavior EDFA, SOA in terms of eye and power diagrams.
A 160-Gb/s OTDM transmission with all-channel modulation and all-channel simultaneous
demultiplexing has been successfully simulated for the first time in article [4]. The MUX and DEMUX using
of MZI switch strictly maintain the delay time between adjacent channels and offer high-temperature stability
because they are hybrid integrated on MZI switch; they will, therefore, be the keys to future OTDM
transmission systems. Authors in [5] obtained the longest transmission distances for a single in-line SOA
and distributed Raman amplifier systems, also to classify some factors that are the most affect transmission
distance. Results extend distance from 69 to 112 kilometers. They also describe factor that effected
transmission in the system with the both proposed systems.
Performances of different optical amplifier types were combined then two most commonly hybrid
amplifiers were used that can offer better action: an erbium doped fiber amplifier (EDFA), and a semiconductor
optical amplifier (SOA), both in grouping to a distributed Raman amplifier (DRA). The results produce less
distortions of the amplified signal [6]. Investigation also made for performance comparison of different hybrid
optical amplifiers (Raman-EDFA, Raman-SOA, SOA-EDFA, EDFA-Raman EDFA). In a system consisted
of 32 and 16 channels with 10 Gbps speed. Authors have documented the different hybrid amplifiers and their
factors like quality, Max eye opening, Bit error rate and output power when changing number of channels [7].
A suggested configuration consists of many channels (16, 32 and 64) were examined by authors
for different hybrid amplifiers performance in their proposed systems at speed of 10 Gbps. The quality factor,
BER, eye opening and jitter at different number of channels were calculated. SOA-EDFA shows a QF
performance as it can reach maximum distance of 260 km at 64 channels [8]. The performance of 64 channels
of 10 Gbps WDM systems was discussed in [9] with backward multipump Raman amplifier to minimize its
gain difference without using any gain flattening practical methods. They present system cost effective with
only four utilized pumps. The maximum flat gain is 8.6 dB . The noise figure was greater than 8 dB were
reached for this wide bandwidth without using techniques of gain flattening.
Our paper is organized into five sections. We focused on a simulation study of optical amplifiers
for performance and comparison purpose, section 2 gives an overview on optical amplifiers used in this work,
moreover section 3 described the simulation setup of optical amplifiers. Section 4 gives analysis of observed
results after simulation. Section 5 gives the conclusion of QF, total gain, and eye opening factor for 16 channels
WDM system. It was observed through simulation that EDFA provided the best performance in terms of total
gain, QF, BER and eye-opening factor.
2. RESEARCH METHOD
Optical amplifiers are core devices in optical amplification transmission system [10, 11], since they
amplify an optical signal directly, therefor no need to an electrical signal conversion, In this paper two types
of optical amplifier are used as illustrated in sections below:
2.1. Raman amplifier-average power model
Raman amplifiers (RA) have become one of the most encouraging technologies for the next group
of fiber amplifiers, mostly due to their flexibility in bandwidth design [12]. Nevertheless, the simulation
techniques that are commonly used for RA's have demanded exhaustive computational time, due to the use
of direct integration of the coupled differential equations that describe the RA behavior [13, 14]. The coupled
differential equations have the shape observed in (1). A similar set of equations, describing the backward
propagation, is solved at the same time we solve the forward equations written below [15-17]. More details
about in (1) with the physical effects taken into account for this amplifier can be found in [16],
𝑑𝑃 𝑓(𝑧,𝑣)
𝑑𝑧
= 𝛼(𝑣)𝑃𝑓(𝑧, 𝑣) + 𝛾(𝑣)𝑃𝑏(𝑧, 𝑣) + 𝑃𝑓(𝑧, 𝑣) ∑
𝑔 𝑟(𝑣−𝜁)
𝐾 𝑒𝑓𝑓 𝐴 𝑒𝑓𝑓
𝑣<𝜁 [𝑃𝑓(𝑧, 𝜁) +
𝑃𝑏(𝑧, 𝜁)] ℎ∆𝑣 ∑
𝑔 𝑟(𝑣−𝜁)
𝐴 𝑒𝑓𝑓
𝑣<𝜁 [𝑃𝑓+𝑃𝑏] [1+ exp ([
ℎ(𝜁−𝑣)
𝑘𝑇
] 1)
−1
] − 𝑃𝑓(𝑧, 𝑣) ∑
𝑔 𝑟(𝑣−𝜁)
𝐾 𝑒𝑓𝑓 𝐴 𝑒𝑓𝑓
𝑣
𝜁𝑣<𝜁 [𝑃𝑓(𝑧, 𝜁)+ 𝑃𝑏(𝑧, 𝜁)] −
2ℎ𝑣∆𝑣𝑃𝑓(𝑧, 𝑣) ∑
𝑔 𝑟(𝑣−𝜁)
𝐴 𝑒𝑓𝑓
𝑣<𝜁 [1+ exp ([
ℎ(𝑣−𝜁)
𝑘𝑇
] 1)
−1
] (1)
The idea behind this technique is first to split the amplifier into a series of small segments, and then
to use the minor signal wave solution in each section in (3). In order to eliminate the dependence in a small
segment length, average powers in each section are introduced in (4). So, basically, we rearranged some terms
of the original in (1) and reduce equations to a simplest form, suitable for our analysis, can be written as [18]:
3. TELKOMNIKA Telecommun Comput El Control
Comparative performance of optical amplifiers: Raman and EDFA (Khalis A. Mohammed)
1703
𝑑𝑃 𝑓(𝑧,𝑣)
𝑑𝑧
= 𝐴(𝑧, 𝑣)𝑃𝑓(𝑧, 𝑣) + 𝐵(𝑧, 𝑣) (2)
where
𝐴(𝑧, 𝑣) = −𝛼(𝑣)+ ∑
g 𝑟(𝑣−ζ)
𝐾 𝑒𝑓𝑓 𝐴 𝑒𝑓𝑓
[𝑃𝑓(𝑧, 𝜁) + 𝑃𝑏(𝑧, 𝜁)] ∑
𝑣
𝜁
g 𝑟(𝑣−ζ)
𝐾 𝑒𝑓𝑓 𝐴 𝑒𝑓𝑓
[𝑃𝑓(𝑧, 𝜁) +𝑣<𝜁𝑣<𝜁
𝑃𝑏(𝑧, 𝜁)] − 2ℎ𝑣∆𝑣 ∑
g 𝑟(𝑣−ζ)
𝐴 𝑒𝑓𝑓
v<ζ [1+
1
exp([
ℎ(𝑣−ζ)
𝑘𝑇
]−1)
−1] (2a)
𝐵(𝑧, 𝑣)=
𝛾(𝑣)𝑃𝑏(𝑧, 𝑣)+ℎ𝑣∆𝑣 ∑
g 𝑟(𝑣−ζ)
𝐴 𝑒𝑓𝑓
[𝑃𝑓(𝑧, 𝜁)+ 𝑃𝑏(𝑧, 𝜁)]𝑣<𝜁 [1+
1
exp([
ℎ(𝑣−ζ)
𝑘𝑇
]−1)
−1] (2b)
substituting Pf(z,ζ), Pb(z,ζ),in (2a), (2b) in each lump by average powers in the lump, coefficients A(z,v), B(z,v)
are independent of z solution for (2) can be written as [18]:
𝑃𝑓(𝑧 𝑜 + 𝐻, 𝑣) = 𝑃𝑓(𝑧 𝑜, 𝑣) exp(𝐴(𝑣)𝐻) +
𝐵(𝑣)
𝐴(𝑣)
[exp ((𝐴(𝑣)𝐻) − 1)] (3)
where H is length of the lumps.
Within each lump, powers Pf (z, ζ), Pb (z, ζ) must be replaced by average powers [18],
〈𝑃𝑓,𝑏(𝑣)〉 = 𝑃𝑓,𝑏
𝑖𝑛 𝐺−1
1𝑛𝐺
+
𝐵(𝑣)
𝐴(𝑣)
[
𝐺−1
1𝑛𝐺
− 1] (4)
where 𝑃𝑓,𝑏
𝑖𝑛
are forward and backward propagating input powers to the lump, and the gain is given
by:𝐺 = exp (𝐴(𝑣)𝐻). The user is responsible to guarantee that the term A(v)does not become zero.
For example, it is impossible to simulate the chromatic dispersion of just one signal if the attenuation is not
considered, hence the term A(v)will become zero.
2.2. Erbium doped fiber amplifier (EDFA)
This optical amplifier repeater employed to amplify the optical signals. The main difference from
the previous on is related to the amplifier pump scheme selection. The used EDFA routines are numerically
solved under stationary conditions [19], these equations are:
𝜕𝑁2(𝑧,𝑡)
𝜕𝑡
₌
𝑁2(𝑧,𝑡)
𝜏
1
𝐴 𝑒𝑓𝑓
∑ {𝛤𝑛[(𝜎 𝑛
𝑒
+ 𝜎 𝑛
𝑎)𝑁2(𝑧, 𝑡) − 𝜎 𝑛
𝑎]}[𝑃𝑛
+(𝑧, 𝑡)+ 𝑃𝑛
−(𝑧, 𝑡)]𝑀
𝑛=1 (5)
𝑁1 + 𝑁2 = 1 (6)
𝜕𝑃 𝑛
±
(𝑧,𝑡)
𝜕𝑧
= 𝑢 𝑛{𝜌𝛤𝑛[(𝜎 𝑛
𝑒
+ 𝜎 𝑛
𝑎)𝑁2(𝑧, 𝑡) − 𝜎 𝑛
𝑎
− 𝛼]}𝑃𝑛
±(𝑧, 𝑡) + 2𝜌∆𝑣𝑁2 𝛤𝑛 𝜎 𝑛
𝑒
(7)
The confinement factor Γn (which is used in simulation program in this paper) is given by [19]:
𝛤𝑛(𝑣) =
∫ |𝐸(𝑟,𝑣)|2 𝑟𝑑𝑟
𝑏
0
∫ |𝐸(𝑟,𝑣)|2 𝑟𝑑𝑟
0
(8)
solving (5-7) under stationary conditions allows designers to conclude the amplifier performance features.
The fiber parameters such as core and Er doping radius, Er metastable lifetime, numerical aperture,
Er ion density, loss at 980 nm and 1550 nm, and the fiber length are all required as input values. The absorption
and emission cross-section are moreover required as input files.
3. SIMULATION MODEL
OptiSystem [20, 21] is used in this work since it is an innovative simulation package for optical
communication system which was establish by Optiwave company to converge the educational and practical
necessities of the system designers, engineers and researchers [22-24]. As shown in Figure 1.
Sixteen transmitters are used at a speed of 10 Gbps in order to study the performance of the Optical amplifiers
4. ISSN: 1693-6930
TELKOMNIKA Telecommun Comput El Control, Vol. 18, No. 4, August 2020: 1701 - 1707
1704
under test. Input signals were fed from data source to the laser modulator. Which are modulated through
a carrier optical output signal transmittance. These signals were spread using transmission line to which
the optical analyzer and spectrum was attached. Then the optical amplifier is located which consists either
Raman or EDFA.
Other amplifiers can also be chosen according to the requirements. Later, the receiver was attached to
notice all signals and transformed to electrical signal. Optical amplifiers were applied with many channels.
The optical signal was transmitted and measured using several distances with 16 channels. Lots of factors like
eye opining, quality factor, and gain were determined at different channels and best one of it is calculated
at a number of channels. These signals were amplified using different amplifiers. The gain was measured by
optical spectrum and WDM analyzer. The modulated signal was transformed into original signal using PIN
photo-detector in the receiver. An oscilloscope and eye diagram analyzer were used to measure the quality
factor and the eye opening at the receiver side. While Figure 2 shows the detailed model, which had been build
using OptiSystem simulator.
Figure 1. Block diagram of the proposed system
Figure 2. OptiSystem simulation model
5. TELKOMNIKA Telecommun Comput El Control
Comparative performance of optical amplifiers: Raman and EDFA (Khalis A. Mohammed)
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4. RESULTS AND ANALYSIS
We focus our attention on the results obtained with the scheme described in Figure 1. Then the first
step is building simulation model of Figure 2 using OptiSystem. Second, we start to increase the fiber length
and measure performance metrics as shown Figure 3. Third and in order to estimate the system performance
the eye diagrams should be analyzed; this is done using Figure 4. The eye diagram is a powerful time domain
tool for assessing the quality of the received signal and for analyzing the signal distortions. It can give much
information on the timing jitter, the system rise time, and the signal amplitude distortions [6]. Fourth the fiber
length, gain and Max Quality factor are listed in Table 1. Finaly relation between fiber length and gain is shown
in Figure 5.
Optical amplifiers Raman and EDFA have been studied for 16×10Gbps Wavelength Division
Multiplexing system in the word of received maximum quality factor (QF), eye opening factor, bit error rate
(BER) and total gain. To investigate the system performances, results from the first channel have been taken.
By examining Figure 3 the variation of QF and BER with various length for 16 channel system can be notice.
Maximum QF was obtained by EDFA which was the similar practically for entire range and begin reductions
after 128km its worst distance at 200 km is 8. Raman have comparably lower QF starting from 19 to 12.7
for distance range from 20 to 80 km and in last at 128 km has lowest value equals 2.4. From the simulation
result, it was seen that maximum eye-opening factor was obtained from EDFA was 90.5527%, while this factor
was equal to 90.2788% for Raman amplifier for 60km. Also, eye diagram for different optical amplifiers with
60 km fiber and 16 channels are shown in Figure 4.
Figure 3. Quality factor (QF) and Bit error rate (BER) as a function of fiber length for 16 channels
(a) (b) (c)
Figure 4. Eye diagram of optical layout used in the simulation without optical amplifier and with Raman
and EDFA amplifiers; (a) without optical amplifier, (b) Raman and (c) EDFA
6. ISSN: 1693-6930
TELKOMNIKA Telecommun Comput El Control, Vol. 18, No. 4, August 2020: 1701 - 1707
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The maximum gain in transmission distance is obtained, that can be accomplished by EDFA
or Raman. System maximum transmission distance is necessary to find first without optical amplification.
therefore, the maximum length of the fiber was found. Simulation results are shown in Table 1. The graph
result for total gain is shown in Figure 5. The same techniques (OptiSystem) used to obtain results in this work
could be also used to improve a new hybrid amplifier with better quality of amplification [6, 8, 25].
Table 1. Simulation results
Amplifier type None EDFA Raman
Fiber length km 104 200 128
Amplifier Gain none 40 23
Max Quality factor 2.4 8.9 2.4
Figure 5. Total gain versus fiber length for the both optical amplifiers, Raman and EDFA
5. CONCLUSION
The proposed optical amplifiers models were successfully designed and implemented via OptiSystem
simulator. The main objective of this research was to investigate which optical amplifier, for several
transmission distance to be used properly in terms of its parameters. The performance of optical amplifier was
calculated via total gain, BER amount, eye opening and quality factor. The simulation results showed
an interesting performance of EDFA, Raman in relations of eye and gain diagrams.
The proposed configuration consisted of 16 channels with the same bit rate transmission. The results
showed that EDFA was enabling to increase the maximal transmission distance to be between 120 to 200 km,
and a promising tool for future. While Raman amplifier extended transmission distance to 140 kilometers.
It was perceived through simulation that EDFA provided the best behavior in relations of total gain, QF,
BER and eye-opening factor. So, Since the EDFA generated less signal distortions, then in future
Implementation of hybrid amplification using EDFA and other one can produce better quality of amplification.
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BIOGRAPHIES OF AUTHORS
Khalis Asa'ad Mohammed works at Northern Technical University/Engineering Technical
College Mosul-Iraq/Department of Computer Technology Engineering. He received B.Sc. degree
in electrical engineering/Electronic and Communication Engineering from University
of Mosul-Iraq in 1990, M.Sc. degree in Electronic and Communication Engineering from University of
Mosul-Iraq in 2001. His research interests and activity are Optical Communication and
Digital Electronics. He teaches digital Electronics, digital techniques and digital circuits for
undergraduate students.
Basma MohammedKamal Younis works at Northern Technical University/Engineering
Technical College-Mosul- Iraq/Department of Computer Technology Engineering. She received
B.Sc. degree in electrical engineering/Electronic and Communication Engineering from
University of Mosul-Iraq in 1995, M.Sc. degree in computer engineering from University
of Mosul- Iraq in 2000 and Ph.D. degree in computer engineering/Microprocessors Architecture
from University of Mosul-Iraq in 2007. Her research interests and activity are Embedded System
Design using FPGA and Computer Graphics. Now, she teaches Advanced Digital Electronics,
Microprocessors Based Systems and Embedded Systems for postgraduate and undergraduate students.