低时延QC-LDPC编码在遥测系统中的应用  

Application of Low Delay QC-LDPC Codes in Telemetry System

作　　者：孙士捷 何云东 孙成 张德超 汤佳骏 SUN Shijie;HE Yundong;SUN Cheng;ZHANG Dechao;TANG Jiajun(Shanghai Institute of Mechanical and Electrical Engineering,Shanghai 201100,China)

机构地区：[1]上海机电工程研究所,上海201100

出　　处：《遥测遥控》2024年第5期68-72,共5页Journal of Telemetry,Tracking and Command

基　　金：中国航天科技集团有限公司上海航天科技创新基金(SAST2021-052)。

摘　　要：本文介绍了一种基于QC-LDPC编码的遥测系统应用方案,提出了编码码长与遥测帧长的联合设计方法,该设计方法对频谱资源、信道质量以及硬件能力进行综合考量,给出最优的设计方案。针对所采用的RU编码算法以及LLR BP译码算法,基于FPGA与AD936X架构给出了遥测系统的硬件实现路线。按照技术路线对系统的编码增益进行了仿真计算,结合理论分析与仿真结果,可以看出所提出的遥测系统设计方法同时具备低时延和高增益的优势。该方法克服了传统遥测系统中信道编码延迟较大的问题,以极小的编码延时带来了约8 dB的编码增益,在未来的遥测系统中具备一定的应用价值。This paper introduces an application of QC-LDPC codes to telemetry system.At the same time,a joint design method of code length and telemetry frame length is proposed.Spectrum resources,channel qualities,and hardware capabilities are comprehensively considered in this design method,so that the optimal scheme can be designed.By using the RU encoding algorithm and the LLR BP decoding algorithm,a hardware implementation method based on FPGA and AD936X architecture is proposed.The coding gain of the designed system is simulated according to the technical route.Combining the theoretical analysis and simulation results,it can be seen that of the advantages of low latency and high gain,the proposed telemetry system design method has certain application value in future telemetry systems.In summary,the proposed method solves the problem of high coding delay in traditional telemetry system,and brings about 8 dB coding gain at the cost of minimal delay.

关 键 词：遥测系统 QC-LDPC 置信传播算法 

分 类 号：TN98[电子电信—信息与通信工程] TN911.22