LDPC码偏移修正加权比特翻转译码算法

大量仿真表明,基于幅度和的改进型加权比特翻转(modified sum of the magnitude based weighted bit flipping, MSMWBF)译码算法对于行重/列重较小的低密度奇偶校验(low density parity check, LDPC)码而言,展现出巨大的性能优势,但对于行重/列重较大的基于有限域几何(finite geometry, FG)的LDPC码,性能损失严重。首先对此现象进行理论分析。其次,引入附加的偏移项对MSMWBF算法的校验方程可靠度信息进行修正,提高了算法对行重/列重较大的LDPC码的译码性能。仿真结果表明,在加性高斯白噪声信道下,误比特率为10E-5时,相比于MSMWBF算法,在适度增加实现复杂度的条件下,所提算法可获得约0.63 dB的增益。

Offset adjustment based weighted bit-flipping decoding algorithm for LDPC codes

Extensive simulations show that for some low density parity check (LDPC) codes of low row/colum weight, the modified sum of the magnitude based weighted bit flipping (MSMWBF) decoding algorithm performs extraordinarily well. However, this dose not hold when it comes to large row/colum weight finite geometry LDPC codes,which is first theoretically analyzed. Secondly,improvement in performance is observed for large row/colum weight LDPC codes by considering an additive offset term for the parity check equation reliability of the above algorithm. Simulation results show that the performance of the improved scheme is better than that of the MSMWBF algorithm about 0.63 dB at bit error rate of 10E-5 over the additive white Gaussian noise channel with only a modest increase in computational complexity.