A Fully Distributed Opportunistic Network Coding Scheme for Cellular Relay Networks

TL;DR

This paper introduces a fully distributed opportunistic network coding scheme for cellular relay networks that improves outage performance and diversity-multiplexing tradeoff without requiring feedback.

Contribution

It presents a novel distributed ONC scheme that operates without feedback and derives its outage probability and DMT, outperforming traditional cooperation methods.

Findings

Outperforms non-cooperative schemes in outage probability

Achieves full diversity and higher multiplexing gain

Operates without feedback in cellular relay networks

Abstract

In this paper, we propose an opportunistic network coding (ONC) scheme in cellular relay networks, which operates depending on whether the relay decodes source messages successfully or not. A fully distributed method is presented to implement the proposed opportunistic network coding scheme without the need of any feedback between two network nodes. We consider the use of proposed ONC for cellular downlink transmissions and derive its closed-form outage probability expression considering cochannel interference in a Rayleigh fading environment. Numerical results show that the proposed ONC scheme outperforms the traditional non-cooperation in terms of outage probability. We also develop the diversity-multiplexing tradeoff (DMT) of proposed ONC and show that the ONC scheme obtains the full diversity and an increased multiplexing gain as compared with the conventional cooperation protocols.