基于迭代的置信傳播編碼調(diào)制在瑞利衰落信道中的性能
Performance of Belief Propagation Coded Modulation with Iterative Decoding over Rayleigh Fading Channel
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摘要: 該文提出一種結(jié)合低密度校驗(yàn)碼(LDPC)和MQAM星座的置信傳播編碼調(diào)制方案,并對其在瑞利衰落信道下成對差錯概率及最優(yōu)星座選擇進(jìn)行了分析。為防止過多錯誤反饋造成譯碼失效,提出采用內(nèi)、外雙重迭代方式提高系統(tǒng)的魯棒性。同時把LDPC碼校驗(yàn)矩陣作為迭代終止判決準(zhǔn)則,降低了迭代算法的平均復(fù)雜度。與其他3種方案相比,仿真結(jié)果證明了該方案能顯著提高系統(tǒng)性能。Abstract: To combine Low-Density Parity-Check (LDPC) codes with MQAM constellation, a scheme of Belief Propagation Coded Modulation with Iterative Decoding (BPCM-ID) is proposed. The Pair Error Probability(PEP) performance in Rayleigh channel and design rules for MQAM constellation are also analyzed. Both outer and inner iterations are used to avoid too much errors feedback which may cause decoding failure. The scheme introduces the check equations of LDPC codes to terminate both iterations which reduce the average decoding complexities greatly. Simulation results show that the proposed BPCM-ID is effective and performs better than the other three schemes.
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