基于循环谱和高阶累积量的联合模式识别方法

A Combined Modulation Recognition Based on Cyclic Spectrum and High-order Cumulants

为完全识别当前卫星通信采用的主要调制方式,结合循环谱和高阶累积量两种信号调制识别方法的特点,提出了一种联合识别算法。该算法将循环谱特征加入到高阶累积量识别法中,联合多种特征参数判决构建识别器,首先利用循环谱完成ASK、FSK、PSK信号的类间识别以及FSK信号的类内识别,在此基础上利用高阶累积量方法完成FSK、PSK信号的类内识别。仿真结果表明,该算法能够完全区分卫星通信中主要的调制模式{ASK、2ASK、2FSK、4FSK、BPSK、QPSK},在信噪比高于5 d B时识别率达88%以上。

To solve the problem of satellite communication signal modulation mode recognition, a novel method based on the cyclic spectrum and high-order cumulants is proposed. In this method, the cyclic spectrum feature is added in the high-order cumulants method and many feature parameter dicisions are combined to construct identifier, cyclic spectrum is used to solve the classification problem of ASK, FSK, PSK and {2ASK,4ASK/modulation recognition firstly, then,higher-order cumulants method is adopted to realize class recognition of FSK, PSK modulation signal. Simulation results show that the algorithm can rec- ognize the main modulations t ASK, 2ASK, 2FSK, 4FSK, BPSK, QPSK t used by satellite communication and the average recognition rate is more than 88% when the signal-to-noise ratio（SNR） ≥5 dB.