LDPC码在BPSK通信系统中的性能分析  

Analysis on LDPC Code Performance in BPSK Communication Systems

作　　者：王飞[1] 罗益 王振华 范广伟 

机构地区：[1]中国人民解放军93575部队 [2]河北省卫星导航技术与装备工程技术研究中心

出　　处：《无线电通信技术》2015年第1期13-16,共4页Radio Communications Technology

基　　金：国家高技术研究发展计划项目(2012AA121801)

摘　　要：LDPC编码在长码条件下具有接近Shannon极限的纠错能力,但是译码较为复杂,因此分析LDPC编码在短码条件下的编译码性能对于扩大LDPC编码的应用范围,降低译码设备的复杂度有着重要的意义。针对较短LDPC编码情况下的判决译码在BPSK系统中的应用,对基于BP算法的几种软判决译码算法进行了介绍,对算法在BPSK系统中的译码性能进行了仿真,仿真结果表明:基于对数测度的BP算法在LDPC短码条件下有着优良的译码性能,能够有效降低通信系统中编译码的复杂度。LDPC encoding has the error correction capability close to the Shannon limit in the conditions of long codes. However,the decoding process is complex. Therefore,the analysis of encoding and decoding performance of LDPC codes in the case of short codes is significant for expanding the scope of its application and reducing the complexity of the decoding equipments. In this paper,for the application of decision decoding in BPSK systemunder conditions of short LDPC codes,two soft decision decoding algorithms based on BP are introduced and their decoding performance is simulated and analyzed. The simulation results show that BP algorithm based on logarithmic measure has a good decoding performance for short LDPC codes and can effectively reduce the encoding and decoding complexity for communication systems.

关 键 词：校验矩阵 置信传播算法 误码率 

分 类 号：TN911.22[电子电信—通信与信息系统]