改进后的LDPC码抗跳周译码算法

Improvement LDPC Anti-Cycle-Slip Decoding Algorithm

在相位调制通信系统中,由于接收机失锁,发生载波相位的突然跳变,使送入译码器的似然信息不准确,导致译码失败。该文通过分析跳周发生前后似然信息的变化规律,结合译码算法的特点,引入跳周检测概率,不但提高了抗跳周能力,而且拓宽了原有算法要求LDPC码检验节点度全为奇数的结论,给LDPC码的抗跳周设计提供了很大的便利。

In PSK modulation communication system,carrier phase often suddenly change because of receiv-er PLL unlock,it made likelihood information sequence which input of LDPC decoder not accurate,that lead to decode fail.This paper adopted Cycle-Slip detection probability combine with the characteristic of decoding algorithm and analysed the regularity of likelihood information after Cycle-Slip happened.It not only raised the ability of Anti-Cycle-Slip,but also broaden the conclusion that al check-nodes degree must be odd number, this found would provide a convenient way for LDPC Anti-Cycle-Slip design.