Overview of Amplify-and-Forward Relaying

2010 ◽  
pp. 29-61
Author(s):  
Ioannis Krikidis ◽  
John S. Thompson
Keyword(s):  
Signal Processing ◽  
Mathematical Models ◽  
Outage Probability ◽  
Fading Channels ◽  
Relay Selection ◽  
Ad Hoc ◽  
Amplify And Forward ◽  
Cooperative Strategy ◽  
Block Fading Channels ◽  
Hoc Networks

Amplify-and-Forward (AF) is a simple cooperative strategy for ad-hoc networks with critical power constraints. It involves an amplification of the received signal in the analogue domain at the relays without further signal processing. This chapter gives an overview of the basic AF protocols in the literature and discuss recent research contributions in this area. Based on some well-defined AF-based cooperative configurations, it focuses on the behaviour of AF in block-fading channels, in power allocation problems, in relay selection, and in cross-layer coordination. Mathematical models and outage probability simulations are used in order to show the enhancements of the presented AF techniques.

scholarly journals Analysis of Packet Diversity in Buffer-Aided Relaying over Symmetric and Asymmetric Rayleigh Fading Channels

Symmetry ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 241 ◽  
Author(s):  
Hina Nasir ◽  
Nadeem Javaid ◽  
Waseem Raza ◽  
Muhammad Shafiq
Keyword(s):  
Outage Probability ◽  
Fading Channels ◽  
Relay Selection ◽  
Signal To Noise Ratio ◽  
Packet Delay ◽  
Cooperative Relaying ◽  
Link Quality ◽  
Relay Channel ◽  
Amplify And Forward ◽  
Active Channels

In this paper, we propose innovative schemes for relay selection that jointly explore packet selection and relay selection for buffer-aided amplify and forward (AF) cooperative relaying networks. The first proposed scheme chooses the most suitable channel based on link quality from all active channels, i.e., channels with neither empty nor full corresponding buffers. In the second proposed scheme, the most suitable channel is chosen based on buffer status. When the source-relay channel is determined, the corresponding relay collects data in the buffer. Likewise, when the relay-destination channel is picked, the most suitable packet is dispatched from the buffer. The most suitable packet is one that provides the highest end-to-end equivalent signal-to-noise ratio. We simulated the outage probability, average throughput and packet delay and analyzed the proposed protocol for both symmetric and asymmetric channel conditions. Comparison is made against the existing buffer-aided schemes. The results show that the proposed relay and packet selection systems help to reduce the outage probability, diversity gain and delay.

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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