一种抑制LDPC码突发错误的软件方法

A Software Method Restricting Incidental Error of LDPC Codes

对低密度奇偶校验码(Low-Density Parity-Check Codes,LDPC)在AWGN(Additive White Gaussian Noise)信道下的译码算法进行了深入研究,分析了在译码过程中出现突发错误的原因,指出出现这种错误是由于在校验矩阵中存在环路,并提出了一种抑制突发错误出现的软件方法。在该方法中,只需对LDPC码的译码程序进行适当控制,就可有效抑制由于环路影响而出现的突发错误,进一步提高了LDPC码的译码性能和译码程序的稳定性,扩大了LDPC码的应用空间。

This paper investigates the LDPC codes decoding algorithm over Additive White Gaussian Noise （AWGN） channels, analyzes the reason that incidental error appears in decoding process, and points out the reason why the incidental error appears is that there are loops in the parity - check matrix. Then a software method, which restricts incidental error, is proposed for decoding LDPC codes. In using this method the incidental error caused by loop＇s influence can be effectively restricted only by properly controlling the decoding program of LDPC. By this method, decoding performance of LDPC codes and decoding program stabilization are improved greatly, and the application of LDPC codes can enter more fields.