On the Diversity-Multiplexing Tradeoff in Multiple-Relay Network
Shahab Oveis Gharan, Alireza Bayesteh, and Amir K. Khandani

TL;DR
This paper introduces a new amplify-and-forward based scheme called random sequential (RS) for multiple-relay networks, achieving maximum diversity gain and optimal diversity-multiplexing tradeoff in various configurations, especially for single-antenna two-hop networks.
Contribution
It proposes the RS scheme for multiple-relay networks and derives its DMT, demonstrating optimality in certain network setups and highlighting limitations in others.
Findings
RS scheme achieves maximum diversity gain in general multiple-antenna networks.
RS scheme attains the optimal DMT in single-antenna two-hop multiple-access relay networks.
In single relay multiple access scenarios, RS reduces to naive amplify-and-forward and is not DMT-optimal.
Abstract
This paper studies the setup of a multiple-relay network in which half-duplex multiple-antenna relays assist in the transmission between a/several multiple-antenna transmitter(s) and a multiple-antenna receiver. Each two nodes are assumed to be either connected through a quasi-static Rayleigh fading channel, or disconnected. We propose a new scheme, which we call \textit{random sequential} (RS), based on the amplify-and-forward relaying. We prove that for general multiple-antenna multiple-relay networks, the proposed scheme achieves the maximum diversity gain. Furthermore, we derive diversity-multiplexing tradeoff (DMT) of the proposed RS scheme for general single-antenna multiple-relay networks. It is shown that for single-antenna two-hop multiple-access multiple-relay () networks (without direct link between the transmitter(s) and the receiver), the proposed RS scheme…
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Taxonomy
TopicsCooperative Communication and Network Coding · Full-Duplex Wireless Communications · Wireless Communication Security Techniques
