基于平均幅度的LDPC码加权比特翻转译码算法
doi: 10.3724/SP.J.1146.2012.01728 cstr: 32379.14.SP.J.1146.2012.01728
Average Magnitude Based Weighted Bit-flippingDecoding Algorithm for LDPC Codes
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摘要: 针对LDPC码的加权比特翻转(WBF)和改进型加权比特翻转(MWBF)算法，该文提出一种改进型算法。该方法以信息节点的平均幅度作为校验方程的可靠度信息，可以提高比特翻转效率。仿真结果表明，在AWGN信道下，误比特率为10-5时，相比于WBF和MWBF算法，该文提出的算法可分别获得约1.65 dB和1.36 dB的增益。同时，平均迭代次数分别降低18.20%~39.91%和17.54%~34.78%。Abstract: Considering the Weighted Bit Flipping (WBF) and Modified Weighted Bit Flipping (MWBF) decoding algorithms for Low Density Parity-Check (LDPC) codes, a modified algorithm is proposed in this paper. Based on Average Magnitude (AM), a more simple and efficient method for computing the reliability of the parity checks is introduced to improve the flipping criterion. Simulation results show that the performance of the improved scheme is better than that of WBF and MWBF algorithms about 1.65 dB and 1.36 dB at BER of10-5in the presence of AWGN, while the average number of decoding iterations is reduced by 18.2%~39.91% and 17.54%~34.78%, respectively.
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