Abstract: This paper investigates LLR algorithm of Low-Density Parity-Check(LDPC) codes in 8 Phase-Shift Keying(8PSK). The computation of the initial information of LDPC is analyzed in 8PSK modulation. The formulas of the computation of the initial information are deduced, and the algorithm is simulated. Simulation results indicate that the decoding performance of LDPC is excellent in 8PSK modulation. For example, the BER can reach 10-6 at 3.5 dB SNR.

Key words: Low-Density Parity-Check(LDPC) codes, 8 Phase-Shift Keying(8PSK), modulation

摘要： 研究低密度奇偶校验码(LDPC)在八相移相键控(8PSK)调制下的LLR算法，分析LDPC码在8PSK调制下初始消息的计算方法，推导初始消息的计算公式。对该算法进行程序仿真，仿真结果表明，LDPC码在8PSK调制中具有良好的性能。当信噪比为3.5 dB时，误码率可达到10-6数量级。

关键词: 低密度奇偶校验码, 八相移相键控(8PSK), 调制

CLC Number: 

• TN911.22