窄宽带数模混合情况下调制方式识别

Modulation Recognition Algorithm of Narrowband Analog and Wideband Digital Mixed Signal

为解决复合调制的窄带调幅-调频(AM-FM)、多音-调频(MTONE-FM)模拟信号和宽带(BPSK,QPSK)数字信号混合集合调制方式识别问题,提出基于全数字锁相环提取信号调制信息的识别方法。对窄带、宽带混合信号采用不同采样时钟的载波跟踪环路,利用载波跟踪频率结合解调信息对接收到的信号进行调制方式识别。和目前广泛使用的基于瞬时频率谱实时识别方法相比,具有更好的识别性能,并通过实验验证了算法的有效性。

In order to identify the modulation recognition of narrowband amplitude modulation-frequency modulation(AM-FM),mtone modulation-frequency modulation(MTONE-FM)analog and wideband(BPSK,QPSK)digital mixed signals,a novel modulation recognition method based on all-digital phase locked loop extracting the modulation information of received signals is proposed.In this algorithm,the carrier tracking loops with different sampling clocks for narrow and wide band mixed signals are used,and the modulation recognition of received signals is identified by combining carrier tracking frequency with demodulation information.The proposed algorithm has better recognition performance than the real-time recognition method based on instantaneous frequency spectrum,which is widely used.Experimental results show the validity of the algorithm.