针对实际工程中基于高阶累计量的调制方式识别方法对信噪比要求较高且对部分调制方式识别率低的问题， 本文提出了基于双谱分析和星座图相结合的一种新的调制方式识别方法。基于高阶累积量提取特征值，进一步对取得的累积 量特征值求傅里叶变换得到接收信号的双谱分析，对QPSK、OFDM和QAM调制信号进行分类识别，对于QAM调制中的 16QAM、32QAM和64QAM调制方式再依据星座图结果进行识别。通过实验数据表明，此调制方式识别方法识别率较高，高 阶谱分析对信噪比要求低。

In order to decrease the effects involved in SNR and improve the recognition rate when we get the information of modulation in practical engineering. This paper proposes a new method of modulation recognition based on bispectrum analysis and constellation. Based on the eigenvalues extracted from higher order cumulant, the FFT of the cumulative value is obtained by bispectrum analysis of the received signal and then QPSK, OFDM and QAM modulation signals are classified and identified. Then 16QAM, 32QAM and 64QAM modulations are identified based on the results of constellation. The experimental data shows that the result of recognition method is better than the other way based on higher order cumulant.