Performance Analysis of Coded Cooperation Based on Distributed Turbo Codes with Multiple Relays

Abstract

Diversity is an effective technique to enhance link quality and enable multiple users to pool their resources to form a virtual antenna array that obtains spatial diversity. In this paper, we propose a generalized Distributed Turbo Codes (DTC)-based coded cooperation protocol for two-hop relay networks with an arbitrary number of relays. This scheme aims at achieving improved diversity over the classical coded cooperation method in Rayleigh fading channels. We derive a finite range single integral solution for the outage probability, which characterizes the coded performance with multiple relays at various rates. We also develop a closed-form expression for the Pairwise Error Probability (PEP) and a tight upper bound for the Bit Error Rate (BER) using DTC. The results demonstrate the merits of DTC-based coded cooperation with multiple relays, under various relay and uplink channel conditions, and show that the proposed scheme is able to achieve the full diversity order. Moreover, the analytical upper bounds are validated with simulation results.