Optimization of parallel concatenated turbo code for coded cooperative communication using extrinsic information transfer chart

In this paper, we address the design of Cooperative communication with coding schemes for the 3-node relay channel with half-duplex constraint. Based on an analysis of the extrinsic information transfer characteristics (EXIT) chart of the component codes we investigate the potential of Turbo codes which are employed by the source node in order to increase the reliability of the system. The source node transmits coded symbols to both the relay and the destination nodes during the first transmission period. The relay performs parallel concatenated codes decoding. It then re-encodes the information bits using a Recursive Systematic Convolutional (RSC) code during the second transmission period. The resultant symbols transmitted from the source and relay nodes can be viewed as the coded symbols of a three-component parallel-concatenated encoder. Thus the EXIT chart is used for iterative decoding and it is helpful to find the best constituent coding schemes for creating parallel concatenated codes for cooperative communication. Thus by considering the interleaver size, code rate and code polynomial we can design a system for cooperative communication using Turbo codes.