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Uniformly reweighted iterative decoding algorithm in BICM-ID system

DUAN Linlin;WANG Zhongyong;WANG Wei;GAO Xiangchuan;WANG Hangye;College of Information Engineering,Zhengzhou University;College of Information System and Engineering,PLA Information and Engineering University;  
The LDPC coded bit-interleaved coded modulation iterative decoding(BICM-ID)system was modeled by a normal factor graph.From the angle of the message update rule,uniformly reweighted belief propagation algorithm(URW-BP)and belief propagation algorithm(BP)are unified and interpreted as message passing algorithm by variation method.Combining the local nature of BP with the improved performance of URW-BP in graphs with cycles,the uniformly reweighted iterative decoding algorithm(URID)was derived and the impact of edge appearance probabilities(EAP)on its performance discussed. Simulation results for AWGN and Rayleigh fading channel and different modulation illustrate the performance improvement of URID compared with other iterative decoding algorithms such as BP and DifferenceMap BP(DMBP)algorithm.
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