Performance Analysis of AF Relaying Systems with Partial Relay Selection

2014 ◽  
Vol 945-949 ◽  
pp. 2262-2265
Author(s):  
Hong Zhang ◽  
Dong Lai Hao ◽  
Hai Yang Ding
Keyword(s):  
Relay Selection ◽  
Error Probability ◽  
Signal To Noise Ratio ◽  
High Signal ◽  
Amplify And Forward ◽  
Symbol Error Probability ◽  
Partial Relay Selection ◽  
Asymptotic Expressions ◽  
Asymptotic Curves ◽  
Relaying Systems

In this Letter, assuming a Nakagami-m fading scenario, closed-form asymptotic expressions for the average symbol error probability (ASEP) of dual-hop amplify-and-forward (AF) cooperative systems with partial relay selection are derived. Based on these expressions, the diversity order is obtained and insightful conclusions are drawn. Numerical results are plotted and the asymptotic curves match very well in the medium and high signal-to-noise ratio (SNR) regions with those obtained by simulations.

scholarly journals Partial Relay Selection for Secure Cooperative NOMA Networks

2021 ◽  
Author(s):  
Wided Hadj Alouane
Keyword(s):  
Fading Channels ◽  
Relay Selection ◽  
Signal To Noise Ratio ◽  
Secrecy Outage Probability ◽  
Amplify And Forward ◽  
Decode And Forward ◽  
Partial Relay Selection ◽  
Asymptotic Expressions ◽  
Selection For ◽  
Secrecy Outage

Abstract In this paper, we investigate physical layer security of multi-relay non-orthogonal multiple access (NOMA) networks with partial relay selection considering decode-and-forward (DF) and amplify-and-forward (AF) protocols. We propose a partial relay scheme aiming to select the best relay based on the highest signal-to-noise-ratio (SNR) of the first link. We derive new exact and asymptotic expressions for strictly positive secrecy capacity (SPSC) and secrecy outage probability (SOP) considering Rayleigh fading channels. Numerical results demonstrate that AF and DF provide almost a similar secrecy performance. Moreover, they prove that partial relay selection improves SPSC and reduces SOP when the relay-cluster is closer to the legitimate receiver.

scholarly journals Symbol Error Probability of DF Relay Selection over Arbitrary Nakagami-mFading Channels

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
George C. Alexandropoulos ◽  
Paschalis C. Sofotasios ◽  
Khuong Ho-Van ◽  
Steven Freear
Keyword(s):  
Fading Channels ◽  
Relay Selection ◽  
Error Probability ◽  
Signal To Noise Ratio ◽  
Moment Generating Function ◽  
Symbol Error Probability ◽  
Decode And Forward ◽  
Shift Keying ◽  
Relaying Systems ◽  
The Moment

We present a new analytical expression for the moment generating function (MGF) of the end-to-end signal-to-noise ratio of dual-hop decode-and-forward (DF) relaying systems with relay selection when operating over Nakagami-mfading channels. The derived MGF expression, which is valid for arbitrary values of the fading parameters of both hops, is subsequently utilized to evaluate the average symbol error probability (ASEP) ofM-ary phase shift keying modulation for the considered DF relaying scheme under various asymmetric fading conditions. It is shown that the MGF-based ASEP performance evaluation results are in excellent agreement with equivalent ones obtained by means of computer simulations, thus validating the correctness of the presented MGF expression.

scholarly journals Effective Capacity Analysis of NOMA Networks with Short Packets

2021 ◽  
Vol 11 (23) ◽  
pp. 11438
Author(s):  
Xiurong Zhang ◽  
Xinwei Yue ◽  
Shaoli Kang
Keyword(s):  
Error Probability ◽  
Signal To Noise Ratio ◽  
Transmission Error ◽  
Effective Capacity ◽  
Low Latency ◽  
High Signal ◽  
Capacity Analysis ◽  
Energy Internet ◽  
Planning And Design ◽  
Asymptotic Expressions

Low latency and a massive connection have become the requirements of energy internet wireless communication. Effective capacity analysis of non-orthogonal multiple access (NOMA) networks with short packets is of vital importance in energy internet communication planning and design. Low-latency communications are one of the main application scenarios in next-generation wireless networks. This paper focuses on the effective capacity of NOMA networks, where the finite blocklength, delay exponent, and transmission error probability are taken into account. New exact and asymptotic expressions of effective capacities are derived for arbitrarily ordered users with a finite blocklength. Based on the analytical results, the high Signal-to-Noise Ratio slopes of effective capacity in NOMA networks are carefully attained. The numerical results validate that (a) non-orthogonal users are capable of obtaining a larger effective capacity when the blocklength decreases, and that (b), as the value of the error probability and delay exponent increases, the effective capacity of non-orthogonal users worsens.

scholarly journals On The Performance of MIMO AF Full-Duplex Joint Antenna and Relay Selection Network

2020 ◽  
Vol 18 (12.2) ◽  
pp. 25
Author(s):  
Nguyen Duy Nhat Vien
Keyword(s):  
Fading Channels ◽  
Relay Selection ◽  
Antenna Selection ◽  
Full Duplex ◽  
High Signal ◽  
Amplify And Forward ◽  
Asymptotic Expressions ◽  
Noise Rate ◽  
Block Fading Channels ◽  
Empirical Performance

This paper investigates a multi-input multi-output (MIMO) multi-relay amplify-and-forward (AF) full-duplex (FD) network using optimal joint relay and antenna selection over Rayleigh block fading channels. For system performance analysis, outage probability (OP) is theoretically analyzed to obtain exact and asymptotic expressions of OP where asymptotic derivations using the assumption of high signal-to-noise rate (SNR) regime. Numerical results are provided to verify the validity of the derived OP expressions by comparing with the related empirical performance. The paper shows that under different scenarios the exact OP expression values are close the related empirical ones while the approximated OP expression values approach to the empirical OP under high SNR conditions.

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