深空通信中LDPC码的编码算法及FPGA实现  

Algorithms and FPGA Implementation of LDPC Encoder for Deep Space Communication

作　　者：李忠亮[1,2] 夏国江[2] 

机构地区：[1]西北工业大学航天学院,陕西西安710072 [2]北京机电工程研究所,北京100074

出　　处：《计算机测量与控制》2011年第5期1199-1202,共4页Computer Measurement &Control

摘　　要：研究了美国喷气推进实验室向CCSDS建议的最新标准中关于深空通信的LDPC码编码技术;首先对编码算法进行了讨论,利用矩阵环与多项式环的同构关系,以及扩展的欧几里德算法,得到了计算准循环生成矩阵的方法;其次,针对准循环矩阵的特点,提出了一种新的基于反馈移位寄存器的编码电路;最后,利用XC4V LX40 FPGA,分别实现了资源优化的全串行编码电路和速度优化的并行编码电路。Low-density-parity-check（LDPC） codes which were proposed by JPL in the latest CCSDS standard for deep space communication is investigated.Firstly,the encoding algorithm is studied.The method for computing quasi-cyclic generator matrix is derived from isomorphism between matrix ring and polynomial ring and extended Euclid＇s algorithm.Secondly,according to the characteristics of quasi-cyclic matrix,a new encoding circuit using feedback shift registers is proposed.Last,sequential encoding circuit with resourse optimization and parallel encoding circuit with speed optimization are implemented based on XC4V LX40 FPGA.

关 键 词：深空通信 LDPC码 准循环 反馈移位寄存器 

分 类 号：TN911.2[电子电信—通信与信息系统]