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针对非协作通信下数字信号解调的问题,提出一种基于粒子滤波和Viterbi序列检测的盲解调算法。粒子滤波使用一组具有相应权值的粒子来表示未知参数的后验分布,再利用Viterbi算法对信号符号作进一步估计,最终实现对数字信号的盲解调。经仿真实验验证,该方法可以有效完成对BPSK、QPSK、UQPSK、OQPSK、8 PSK等常用PSK数字信号类型的盲解调,且较传统方法实现起来更为方便。
In order to solve the problem of digital signal demodulation in non-cooperative communication, a blind demodulation algorithm based on particle filter and Viterbi sequence detection is proposed. Particle filter uses a set of particles with corresponding weights to represent the posterior distribution of unknown parameters, and then uses the Viterbi algorithm to further estimate the signal symbols, finally realizing the blind demodulation of digital signals. The simulation results show that this method can effectively accomplish the blind demodulation of the common PSK digital signal types such as BPSK, QPSK, UQPSK, OQPSK and 8 PSK, and is more convenient than the traditional method.