A Training based Distributed Non-Coherent Space-Time Coding Strategy

TL;DR

This paper introduces a novel training-based distributed non-coherent space-time coding strategy for wireless relay networks, providing explicit code constructions that achieve full diversity and extend existing methods for colocated MIMO systems.

Contribution

It develops a new training-based approach for distributed non-coherent space-time coding in relay networks, including explicit code constructions for full diversity.

Findings

Explicit two-group decodable codes for even relays

Achieves full cooperative diversity

Extends existing MIMO coding strategies

Abstract

Unitary space-time modulation is known to be an efficient means to communicate over non-coherent Multiple Input Multiple Output (MIMO) channels. In this letter, differential unitary space-time coding and non-coherent space-time coding for the training based approach of Kim and Tarokh are addressed. For this approach, necessary and sufficient conditions for multi-group decodability are derived in a simple way assuming a Generalized Likelihood Ratio Test receiver and a unitary codebook. Extending Kim and Tarokh's approach for colocated MIMO systems, a novel training based approach to distributed non-coherent space-time coding for wireless relay networks is proposed. An explicit construction of two-group decodable distributed non-coherent space-time codes achieving full cooperative diversity for all even number of relays is provided.