卫星激光通信中基于Zig-Zag结构的原模图QC-LDPC码构造方法  

Construction of QC-LDPC Code Based on Zig-Zag Structure in Satellite Laser Communication

作　　者：袁建国[1] 刘议靖 李志伟 YUAN Jianguo;LIU Yijing;LI Zhiwei(Chongqing Key Laboratory of Photoelectronic Information Sensing and Transmitting Technology,Chongqing University of Posts and Telecommunications,Chongqing 400065,CHN)

机构地区：[1]重庆邮电大学光电信息感测与传输技术重庆市重点实验室,重庆400065

出　　处：《半导体光电》2021年第3期437-441,共5页Semiconductor Optoelectronics

基　　金：国家自然科学基金项目(61971079);2020年重庆市(重庆邮电大学)研究生科研创新项目。

摘　　要：为应对卫星激光通信信道的时变性、改善传输的可靠性,提出一种基于Zig-Zag结构的原模图QC-LDPC码构造方法。该方法将原模图与Zig-Zag结构的移位系数设计方法相结合,构造校验矩阵围长至少为8且码长码率可灵活选择的ZZ-QC-LDPC码。仿真结果表明:该方法所构造的ZZ-QC-LDPC码在误码率为10^(-6)时,与同码率下基于等差数列和原模图构造的QC-LDPC码和基于最大公约数构造的QC-LDPC码以及具有大围长快速编码特性的QC-LDPC码相比,其净编码增益分别提高了约0.2,0.1和0.64dB,且在较大码率范围内均具有良好的纠错性能。In order to improve the channel time-varying and the transmission reliability of satellite laser communications,a novel construction method of protograph quasi-cyclic lowdensity parity-check(QC-LDPC)codes based on the Zig-Zag(ZZ)structure is proposed.This construction method combines the protograph with the method of designing the shift coefficient of the Zig-Zag structure to construct the ZZ-QC-LDPC code with the check matrix of the girth-8 and the flexibly adjustable code-length code-rate.The simulation results show that under the same code-rate,the net coding gains of the ZZ-QC-LDPC code constructed by the proposed construction method,compared with the QC-LDPC code based on the arithmetic progression and protograph and the QC-LDPC code based on the greatest common divisor as well as the QC-LDPC code based on the large-girth fast encoding characteristics,can be improved by about 0.2,0.1 and0.64 dB respectively at the bit error ratio of 10^(-6),furthermore,the ZZ-QC-LDPC code has the more excellent error-correcting performance within the wider code-rate range.

关 键 词：Zig-Zag结构 原模图 QC-LDPC码 误码率 净编码增益 

分 类 号：TN929.11[电子电信—通信与信息系统]