Distributed Turbo-Like Codes for Multi-User Cooperative Relay Networks

TL;DR

This paper introduces a distributed turbo-like coding scheme for multi-user relay networks that enhances performance and flexibility by allowing the relay to generate adjustable redundancy, enabling efficient joint decoding at the destination.

Contribution

It proposes a novel distributed turbo-like coding scheme for multi-user relay networks that improves performance and flexibility over non-cooperative systems.

Findings

Significant performance gains over non-cooperative systems.

High flexibility in code rate, block length, and number of users.

Effective joint decoding exploiting relay redundancy.

Abstract

In this paper, a distributed turbo-like coding scheme for wireless networks with relays is proposed. We consider a scenario where multiple sources communicate with a single destination with the help of a relay. The proposed scheme can be regarded as of the decode-and-forward type. The relay decodes the information from the sources and it properly combines and re-encodes them to generate some extra redundancy, which is transmitted to the destination. The amount of redundancy generated by the relay can simply be adjusted according to requirements in terms of performance, throughput and/or power. At the destination, decoding of the information of all sources is performed jointly exploiting the redundancy provided by the relay in an iterative fashion. The overall communication network can be viewed as a serially concatenated code. The proposed distributed scheme achieves significant performance gains with respect to the non-cooperation system, even for a very large number of users. Furthermore, it presents a high flexibility in terms of code rate, block length and number of users.