基于多阶循环累积量的多用户调制分类方法

Multiuser modulation classification method based on multi-order cyclic cumulants

针对多径信道中调制信号识别正确率低的问题,提出一种基于多阶循环累积量的多用户调制分类方法。利用调制信号循环累积量的差异性,分别计算多个接收信号的多阶循环累积量,构造接收信号的归一化四阶循环累积量向量,结合盲信道估计方法,估计发射信号的归一化四阶循环累积量向量,将该向量作为特征参数进行提取,实现对多用户信号调制类型的识别。仿真结果表明,在低信噪比条件下,该方法具有较高的正确分类概率,对色噪声具有较好抑制作用,可以推广到更高阶的多发射机调制识别形式。

Aiming at the low probability of correct classification of digital modulation identification in multipath fading channel.A modulation classification method was proposed based on multi-order cyclic cumulants.All the multi-order cyclic cumulants of receiving signals were computed using the overlaying property of cyclic cumulants.The normalized cyclic cumulants vector of the whole receiving signals was constructed.The multi-order cyclic cumulants vector of the input signals was estimated utilizing the inverse transformation matrix.The feature parameters of the multi-order cyclic cumulants vector of the receiving signals were extracted and put out to realize the recognition of multiple modulation types.The simulation results show that the classification method has higher probability of correct classification in low signal noise ratio（SNR）,and the method can eliminate the influence of the colored noise.It can be applied to higher order multiple modulation identification.