摘要
GPS现代化中的L1C信号使用了LDPC码,以提高接收机的弱信号接收能力。L1C信号中使用的LDPC码没有循环或准循环结构,这为译码器设计带来了难度。为了降低译码器实现复杂度,在分析L1C信号LDPC码校验矩阵结构的基础上,通过对校验节点分类和改变变量节点更新方法,提出了一种低存储量和简化译码器控制逻辑的低复杂度译码器结构,并通过仿真验证了译码器译码结果的正确性。
In GPS modernization, LDPC code is used in L1 C signal to enhance the receivers＇ performance in weak signal environments. The LDPC codes used in L1C signal do not have cyclic or quasi-cyclic structure, which increases the complexity of decoder. To reduce the implementation complexity of decoder, the structure of parity check matrix of the LDPC code used in GPS L1C signal was analyzed. Based on the analysis, a complexity-reduced decoder was presented. The presented decoder divides the check nodes into two groups and changes the variable nodes updating way, which can reduce the storage and simplify the control logic of the decoder. The decoding ~＇esults of the presented decoder are validated by simulation.
出处
《国防科技大学学报》
EI
CAS
CSCD
北大核心
2013年第1期65-69,共5页
Journal of National University of Defense Technology
基金
国家部委资助项目
