串行级联连续相位调制性能仿真分析  

Simulation analysis of serially concatenation convolutional code performance

作　　者：刘铭权 叶展 Liu Mingquan;Ye Zhan(School of Electronic and Information Engineering,Nanjing University of Information Science&Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学电子与信息工程学院,南京210044

出　　处：《电子测量技术》2021年第21期139-144,共6页Electronic Measurement Technology

摘　　要：连续相位调制(CPM)是一类包络恒定的调制方式,具有较高的频谱利用率和功率利用率。其恒包络特性可以在调制中很好的适应非线性放大器。这使得连续相位调制可以在诸如卫星通信、深空通信等通信领域中得到很好的应用。为提高系统性能,使用串行级联码与连续相位调制技术结合的系统模型。由于传统译码算法复杂度高的问题,使用改进的Max-Log-APP算法进行译码。在加性高斯白噪声信道下,针对译码迭代次数和CPM参数众多互相关联的问题,设计了一种参数优化方法。结果表明,在低信噪比的情况下,优化参数后的系统误比特率能有1 dB左右的性能提升。Continuous phase modulation is a kind of modulation with constant envelope,which has high frequency spectrum utilization and power utilization.Its constant envelope property can be well adapted to nonlinear amplifier modulation.So continuous phase modulation can be used in satellite communication,deep space communication and other communication fields.In order to improve the system performance,a system model combining serial cascade code and continuous phase modulation is used.Due to the high complexity of the traditional decoding algorithm,the improved Max-Log-APP algorithm is used for decoding.In the additive Gaussian white noise channel,a parameter optimization method is designed to solve the problem of the correlation between decoding iterations and CPM parameters.The results show that under the condition of low SNR,the system performance can be improved about 1 dB by optimizing the bit error rate.

关 键 词：连续相位调制 串行级联卷积码 Max-Log-APP算法 迭代译码 

分 类 号：TN911.2[电子电信—通信与信息系统]