摘要：An iterative detection/decodingalgorithm of correlated sources for the LD-PC-based relay systems is presented. Thesignal from the source-destination （S-D） linkis formulated as a highly correlated counter-part from the relay-destination （R-D） link.A special XOR vector is defined using thecorrelated hard decision information blocksfrom two decoders and the extrinsic infor-mation exchanged between the two decodersis derived by the log-likelihood ratio （LLR）associated with the XOR vector. Such thedecoding scheme is different from the tradi-tional turbo-like detection/decoding algorithm,where the extrinsic information is computedby the side information and the soft decoderoutputs. Simulations show that the presentedalgorithm has a slightly better performancethan the traditional turbo-like algorithm （Tak-ing the （255,175） EG-LDPC code as an ex-ample, it achieves about 0.1dB performancegains around BLER=10-4）. Furthermore, thepresented algorithm requires fewer comput-ing operations per iteration and has fasterconvergence rate. For example, the averageiteration of the presented algorithm is 33 atSNR=I.SdB, which is about twice faster thanthat of the turbo-like algorithm, when decod-ing the （961,721） QC-LDPC code. Therefore,the presented decoding algorithm of correlatedsources provides an alternative decoding solu-tion for the LDPC-based relay systems.

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