基于迭代的置信传播编码调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: 该文提出一种结合低密度校验码(LDPC)和MQAM星座的置信传播编码调制方案,并对其在瑞利衰落信道下成对差错概率及最优星座选择进行了分析。为防止过多错误反馈造成译码失效,提出采用内、外双重迭代方式提高系统的鲁棒性。同时把LDPC码校验矩阵作为迭代终止判决准则,降低了迭代算法的平均复杂度。与其他3种方案相比,仿真结果证明了该方案能显著提高系统性能。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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