Papers by Thuỳ Dương Vũ Nguyễn
IEEE Transactions on Wireless Communications, 2013
Despite encouraging advances in the design of relay codes, several important challenges remain. M... more Despite encouraging advances in the design of relay codes, several important challenges remain. Many of the existing LDPC relay codes are tightly optimized for fixed channel conditions and not easily adapted without extensive re-optimization of the code. Some have high encoding complexity and some need long block lengths to approach capacity. This paper presents a high-performance protograph-based LDPC coding scheme for the half-duplex relay channel that addresses simultaneously several important issues: structured coding that permits easy design, low encoding complexity, embedded structure for convenient adaptation to various channel conditions, and performance close to capacity with a reasonable block length. The application of the coding structure to multi-relay networks is demonstrated. Finally, a simple new methodology for evaluating the end-to-end error performance of relay coding systems is developed and used to highlight the performance of the proposed codes. Index Terms Relay channel, LDPC codes, protograph codes, multiple-relay channel I. INTRODUCTION To harvest the cooperative gain promised by information theory [1], [2], coding schemes are needed that can approach the fundamental limits of the relay channel. Among the early coding results for the relay channel were distributed coded diversity schemes [3], [4], [5], which proposed convolutional and turbo codes for the fading channel under cooperation. Later on, Duman et al. [6], [7] proposed turbo This work was presented in part in the 2010 IEEE International Symposium on Information Theory.
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Papers by Thuỳ Dương Vũ Nguyễn