LDPC乘积码性能分析  

Performance Analysis of LDPC Product Codes

作　　者：吴晓丽[1] 葛建华[2] 岳安军[2] 

机构地区：[1]西安电子科技大学ISN国家重点实验室,陕西西安710071 [2]空军工程大学电讯工程学院,陕西西安710077

出　　处：《空军工程大学学报（自然科学版）》2007年第3期84-86,共3页Journal of Air Force Engineering University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(60332030;60496316)

摘　　要：提出了一种LDPC乘积码的编码和译码方法,在编码端,用误码性能好的LDPC码代替扩展的BCH码构成LDPC乘积码,提高用扩展的BCH码构成的Turbo乘积码(TPC)的误码性能;另一方面,用短的LDPC码以乘积码的编码方式构成长码,降低了LDPC码的编码复杂度。计算机仿真结果显示,LDPC乘积码在信噪比小于3.5dB时,其误码率低于BCH乘积码,但在信噪比大于3.5 dB时,其误码率高于BCH乘积码,与等长的LDPC码相比,LDPC乘积码在低信噪比时,性能较好,但在高信噪比性能较差。A new method of LDPC product encoding and decoding by using the LDPC codes as component code is proposed. On the one hand, a low bit error ratio is obtained compared to the BCH product codes using binary extended BCH codes as component code. On the other hand, long LDPC codes are formed with short LDPC codes in the form of product codes, lowering complexity of long LDPC codes encoding. The simulation result shows that at low SNR, the bit error ratio of LDPC product codes is lower than that of the BCH product codes, at high SNR, the bit error ratio of LDPC product codes is higher than that of the BCH product codes. The same result is obtained compared with the same long LDPC codes. So the LDPC product codes are effective at low SNR.

关 键 词：LDPC码 TURBO迭代译码 TURBO乘积码 可信传播译码算法 

分 类 号：TN911.22[电子电信—通信与信息系统]