一种单信道时频重叠信号调制识别方法

摘要

To solve the problem of modulation recognition of two time-frequency overlapped signals in sin-gle channel,a method based on correlation characteristics is proposed. On the basis of studying the correla-tion characteristics of the selected digital communication signals,the spectrum peaks' amount,amplitudes, and location variance of signals' delay correlation and instantaneous correlation are extracted as the feature parameters to achieve modulation recognition of two time-frequency overlapped signals with the same carri-er frequency. Simulation results show that this method has good performance in the Gaussian noise, and when signal-to-noise ratio( SNR) is above -5 dB,the average correct recognition rate is beyond 95%.%针对单信道时频重叠信号调制方式的识别分类问题,提出了基于信号相关特性的调制识别方法. 在研究所选数字通信信号的相关特性的基础上,提取信号延迟相关和瞬时自相关谱峰的数量、幅度和位置方差作为特征参数,实现了同载频时频重叠双信号的调制识别. 仿真结果表明,在理想高斯白噪声背景下,该方法具有良好的识别性能,当信噪比大于-5 dB时,其正确识别率达到95%以上.