Recovering Multiplexing Loss Through Successive Relaying Using Repetition Coding

TL;DR

This paper presents a new relay transmission protocol using repetition coding that recovers multiplexing loss in half-duplex relay networks, achieving improved performance by balancing diversity and multiplexing gains.

Contribution

It introduces a novel successive relaying scheme with repetition coding and space-time V-BLAST detection that approaches theoretical capacity limits.

Findings

The scheme recovers multiplexing loss while maintaining diversity gain.

It outperforms conventional protocols in strong interference scenarios.

Achieves near-capacity rates with simple relay operations.

Abstract

In this paper, a transmission protocol is studied for a two relay wireless network in which simple repetition coding is applied at the relays. Information-theoretic achievable rates for this transmission scheme are given, and a space-time V-BLAST signalling and detection method that can approach them is developed. It is shown through the diversity multiplexing tradeoff analysis that this transmission scheme can recover the multiplexing loss of the half-duplex relay network, while retaining some diversity gain. This scheme is also compared with conventional transmission protocols that exploit only the diversity of the network at the cost of a multiplexing loss. It is shown that the new transmission protocol offers significant performance advantages over conventional protocols, especially when the interference between the two relays is sufficiently strong.