在分析了星座映射对比特交织编码调制迭代译码影响的基础上,给出了迭代解调和解码时,星座映射的设计准则,进而给出了一种新的迭代解码的8PSK映射方案。新方案不但满足最大平方欧氏距离(MSEW)映射,在高信噪比时具有较好的性能,而且提高了解调器软信息的输出质量,因而在低信噪比时也具有较好的性能。性能分析和仿真结果表明所给方案的有效性。 Based on the analysis of the influence of constellation mapping on iterative decoding of bit interleaving coding, a design criterion for constellation mapping in iterative demodulation and decoding is given, and a new iterative decoding 8PSK mapping scheme is given. The new scheme not only satisfies the maximum square Euclidean distance (MSEW) mapping, but also has better performance at high signal-to-noise ratio and better output quality of demodulator soft information, so it also has better performance at low SNR . Performance analysis and simulation results show the effectiveness of the proposed solution.