Hybrid Hard/Soft Decode-and-Forward Relaying Protocol with Distributed Turbo Code
ICCSA '09 Proceedings of the International Conference on Computational Science and Its Applications: Part II
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IEEE Transactions on Wireless Communications
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ISWCS'09 Proceedings of the 6th international conference on Symposium on Wireless Communication Systems
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ICC'09 Proceedings of the 2009 IEEE international conference on Communications
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ICC'09 Proceedings of the 2009 IEEE international conference on Communications
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The Journal of Supercomputing
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It has been shown that distributed turbo coding (DTC) can approach the capacity of a wireless relay network. In the existing DTC schemes, it is usually assumed that error-free decoding is performed at a relay. We refer to this type of DTC schemes as perfect DTC. In this paper, we propose a novel DTC scheme. For the proposed scheme, instead of making a decision on the transmitted information symbols at the relay as in perfect DTC, we calculate and forward the corresponding soft information. We derive parity symbol soft estimates for the interleaved source information when only the a posteriori probabilities of the information symbols are known. The results show that the proposed scheme can effectively mitigate error propagation due to erroneous decoding at the relay. Simulation results also confirm that the proposed scheme approaches the outage probability bound of a distributed two-hop relay network at high signal-to-noise ratios