一种基于信道盲辨识和盲均衡的多径信道调制方式识别算法

A Novel Modulation Identification Algorithm for Multi-path Channels Based on Blind Channel Identification and Equalization

针对多径环境下MPSK和MQAM信号的调制识别问题,该文提出了一种基于信道盲辨识和盲均衡的调制识别算法。算法首先进行信道阶数精确估计,然后以矩阵外积分解为基础,加入特征值扰动分析,提高了信道盲辨识和盲均衡的稳定性,最后,对均衡后的星座图进行多级减法聚类,得到信号的调制方式。与现有算法相比,算法结构简单,所需数据量小,适用范围广,实用性强。仿真结果证明了算法的有效性。

A modulation identification algorithm based on blind channel identification and equalization is proposed for MPSK and MQAM signals in multi-path environments. The channel order is estimated accurately first. Then, the eigenvalue perturbation analysis is done on the basis of matrix outer-product decomposition to get the more stable performance of channel blind identification and equalization. Finally, the multistage blind subtractive clustering method is used for the equalized constellation to determine the modulation type. Compared with the existing methods, it is a simple solution with smaller number of symbols for more modulation types and is more suitable for the practical application. Simulation results prove the effectiveness of the algorithm.