北斗卫星导航系统多进制LDPC编码性能评估  

Performance evaluation of BDS M-ary LDPC encoding

作　　者：宿晨庚 黄勤[3] 刘旭楠[4] SU Chengeng;HUANG Qin;LIU Xunan(College of Electronic Science,National University of Defense Technology,Changsha 410073,China;Beijing Institute of Tracking and Telecommunication Technology,Beijing 100094,China;School of Electronic and Information Engineering,Beihang University,Beijing 100191,China;National Marine Hazard Mitigation Service,Beijing 100194,China)

机构地区：[1]国防科技大学电子科学学院,湖南长沙410073 [2]北京跟踪与通信技术研究所,北京100094 [3]北京航空航天大学电子信息工程学院,北京100191 [4]国家海洋局海洋减灾中心,北京100194

出　　处：《国防科技大学学报》2019年第4期121-128,共8页Journal of National University of Defense Technology

基　　金：国家自然科学基金资助项目(6180022838)

摘　　要：考虑到卫星导航系统传输距离远、落地信号功率低,导航接收机在复杂遮挡环境下可能受到干扰不能正常解调电文,导航电文设计中一般采用纠错编码获取编码增益来提升恶劣环境下的解调性能。随着技术水平的提高,各大系统在现代化升级过程中越来越多地采用性能更优的纠错编码,北斗全球系统现代化信号导航电文将采用多进制LDPC编码。在研究多进制LDPC编译码原理基础上,首次对北斗采用的64进制LDPC进行了软件仿真和硬件实现,对北斗卫星导航系统多进制LDPC编译码性能和实现复杂度进行了仿真分析和试验平台测试,结果表明,多进制LDPC编码方案具有较高的编码增益,相对二进制LDPC有0.4~0.8dB的优势,对于恶劣环境下的解调性能具有较大改善,该研究可为北斗现代化信号接收终端研发提供参考。Due to the long transmission distance and low power,satellite navigation receivers may not be able to demodulate the message normally in the complex environment.Error correction encodings were commonly used in the navigation message design to improve demodulation performance.With the improvement of technology,more powerful error-correction codes have been adopted in the modernization of GNSS (global navigation satellite system).BDS (BeiDou navigation satellite system ) new signals will adopt M -ary LDPC (low density parity check) encoding.Based on the principle of M -ary LDPC codes,the software simulation and hardware test results of M -ary LDPC codes on BDS were presented.Results show that the 64-ary LDPC codes have high coding gain,and they can outperform about 0.4~0.8 dB over their binary counterparts,which will greatly improve the demodulation performance under harsh environment.The results can provide reference for the development of BDS new receivers.

关 键 词：北斗 卫星导航 多进制LDPC编码 

分 类 号：TN96[电子电信—信号与信息处理]