一种基于非平稳信号分析的时相调制信号解调算法

基于非平稳信号分析方法,对时相调制(Time-Phase Modulation,TPM)信号的时频分布特性进行了详细分析,建立了TPM调制信号相位突变与时频分布幅度的映射关系,利用该映射提出了一种基于非平稳信号分析的TPM调制信号解调算法,并对该解调算法性能进行了理论分析,讨论了最佳判决门限选取方法,仿真结果验证了理论分析的正确性。理论分析及仿真表明,基于非平稳信号分析的TPM调制信号解调算法获得了优于传统的相关解调的调制系统差错性能。

A Demodulation Algorithm for Time-Phase Modulation Basedon Non-Stationary Signal Analyzing

In this paper, the property of time-frequency distribution for time-phase modulation （TPM） signal was analyzed based on non-stationary signal analyzing method. The mapping model between phase mutation and amplitude of time-frequency distribution for TPM signal was proposed, and by using this model, a demodulation algorithm for TPM based on non-stationary signal analyzing was presented. Furthermore, the performance of the demodulation algorithm was analyzed and the problem about the choice of optimum decision limens was discussed. The validity of the theoretical analysis was proved by simulation result. The results of theory and simulation showed that the demodulation algorithm provided by this paper not only could offer good error performance for TPM system, but also could bring a new valuable method for communication signal processing based on non-stationary theory.