scholarly journals The impact of unknown correlated rayleigh fading on the information rates of dual-hop amplify and forward relay channels

2011 ◽  
Author(s):  
Mohammadali Mohammadi ◽  
Parastoo Sadeghi ◽  
Tharaka A. Lamahewa ◽  
Mehrdad Ardebilipour
Keyword(s):  
Rayleigh Fading ◽  
Relay Channels ◽  
Amplify And Forward ◽  
Information Rates ◽  
The Impact

Outage Analysis of Cooperative Communication Network with Hardware Impairments

Frequenz ◽  
2015 ◽  
Vol 69 (9-10) ◽  
Author(s):  
Kefeng Guo ◽  
Jin Chen ◽  
Yuzhen Huang
Keyword(s):  
Fading Channel ◽  
Rayleigh Fading ◽  
Cooperative Networks ◽  
Amplify And Forward ◽  
Hardware Impairments ◽  
Partial Relay Selection ◽  
Asymptotic Expressions ◽  
Simulation Results ◽  
The Impact ◽  
Outage Analysis

AbstractThe hardware impairments of physical transceivers that create distortions degrade the performance of communication. In this paper, we investigate the impact of hardware impairments on the outage performance of dual-hop amplify-and-forward (AF) cooperative networks with partial relay selection. Specifically, the approximated closed-form and asymptotic expressions for the outage probability of dual-hop AF relaying networks with hardware impairments are derived over Rayleigh fading channel, which provides a fast and efficient means to evaluate the impact of hardware impairments on the system performance. In addition, simulation results and intuitive discussions are provided to show the correctness of the analytical results. The finding of this paper suggests that the outage error floor exists when the hardware impairment exists.

scholarly journals Evaluation of PLC Channel Capacity and ABER Performances for OFDM-Based Two-Hop Relaying Transmission

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Sana Ezzine ◽  
Fatma Abdelkefi ◽  
Jean Pierre Cances ◽  
Vahid Meghdadi ◽  
Ammar Bouallégue
Keyword(s):  
Channel Capacity ◽  
Orthogonal Frequency Division Multiplexing ◽  
Low Cost ◽  
Relay Node ◽  
Destination Node ◽  
Direct Link ◽  
Amplify And Forward ◽  
Decode And Forward ◽  
Maximum Ratio Combining ◽  
The Impact

Powerline network is recognized as a favorable infrastructure for Smart Grid to transmit information in the network thanks to its broad coverage and low cost deployment. The existing works are trying to improve and adapt transmission techniques to reduce Powerline Communication (PLC) channel attenuation and exploit the limited bandwidth to support high data rate over long distances. Two-hop relaying BroadBand PLC (BB-PLC) system, in which Orthogonal Frequency Division Multiplexing (OFDM) is used, is considered in this paper. We derive and compare the PLC channel capacity and the end-to-end Average BER (ABER) for OFDM-based direct link (DL) BB-PLC system and for OFDM-based two-hop relaying BB-PLC system for Amplify and Forward (AF) and Decode and Forward (DF) protocols. We analyze the improvements when we consider the direct link in a cooperative communication when the relay node only transmits the correctly decoded signal. Maximum ratio combining is employed at the destination node to detect the transmitted signal. In addition, in this paper, we highlight the impact of the relay location on the channel capacity and ABER for AF and DF transmission protocols. Moreover, an efficient use of the direct link was also investigated in this paper.

scholarly journals BER analysis of amplify-and-forward relaying FSO systems using APD receiver over strong atmospheric turbulence channels

2019 ◽  
Vol 9 (5) ◽  
pp. 3678
Author(s):  
Duong Huu Ai ◽  
Van Loi Nguyen
Keyword(s):  
Atmospheric Turbulence ◽  
Closed Form Expression ◽  
Free Space Optical ◽  
Amplify And Forward ◽  
Transmission Distance ◽  
Link Distance ◽  
Optimal Value ◽  
Atmospheric Loss ◽  
The Impact ◽  
Relay Stations

<span lang="EN-US">In this paper, we theoretically analyze the performance of amplify-and-forward (AF) serial relaying free-space optical (FSO) systems using avalanche photodiodes (APD) and subcarrier quadrature amplitude modulation (SC-QAM) over strong atmospheric turbulence channels modelled by gamma-gamma distribution. Closed-form expression for average bit error rate (BER) of system is theoretically derived talking into account APD shot noise, thermal noise as well as the impact of atmospheric loss and turbulence. The numerical results show that using AF relay stations can extend the transmission distance and help to improve performance of FSO system significantly when compared with the direct transmission. Moreover, the selection of APD gain value is indispensable to the system performance. The proposed system could be achieved the best performance by selecting an optimal APD gain value. In addition, the optimal value of APD gain also significantly depends on various conditions, such as link distance, the number of relay stations and APD receiver noise.</span>

scholarly journals Linear Multi-hop Amplify-and-Forward (AF) Cooperative Relay Channels

10.7125/40.10 ◽  
2015 ◽  
Vol 40 (0) ◽  
pp. 64 ◽  
Author(s):  
Li Suet Mok ◽  
Chee Kyun Ng ◽  
Nor Kamariah Noordin
Keyword(s):  
Cooperative Relay ◽  
Relay Channels ◽  
Amplify And Forward

scholarly journals Performance Analysis of Full-Duplex Amplify-and-Forward Relay System with Hardware Impairments and Imperfect Self-Interference Cancellation

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Ba Cao Nguyen ◽  
Xuan Nam Tran
Keyword(s):  
Interference Cancellation ◽  
Signal To Noise Ratio ◽  
Relay Node ◽  
Analytical Framework ◽  
Full Duplex ◽  
High Signal ◽  
Amplify And Forward ◽  
Relay System ◽  
Hardware Impairments ◽  
The Impact

In this paper, we analyze the performance of a full-duplex (FD) amplify-and-forward (AF) relay system with imperfect hardware. Besides the aggregate hardware impairments of the imperfect transceiver, we also consider the impact of residual self-interference (RSI) due to imperfect cancellation at the FD relay node. An analytical framework for analyzing the system performance including exact outage probability (OP), asymptotic OP, and approximate symbol error probability (SEP) is developed. In order to tackle these impacts, we propose an optimal power allocation scheme which can improve the outage performance of the FD relay node, especially at the high signal-to-noise ratio (SNR) regime. Numerical results are presented for various evaluation scenarios and verified using the Monte Carlo simulations.

Relay Placement for Amplify-and-Forward Relay Channels with Correlated Shadowing

2013 ◽  
Vol 2 (2) ◽  
pp. 171-174 ◽  
Author(s):  
Liang Han ◽  
Chuan Huang ◽  
Shihai Shao ◽  
Youxi Tang
Keyword(s):  
Relay Channels ◽  
Amplify And Forward ◽  
Correlated Shadowing ◽  
Relay Placement
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