一种用于多径信道的调制识别算法仿真研究  

Novel Modulation Identification Algorithm for Multi-path Channels

作　　者：王彬[1] 葛临东[1] 刘媛涛[1] 

机构地区：[1]解放军信息工程大学信息工程学院,河南郑州450002

出　　处：《系统仿真学报》2007年第24期5736-5741,共6页Journal of System Simulation

基　　金：国防预研项目(6130320)

摘　　要：无线信道的多径衰落造成通信信号的码间干扰,为通信信号的调制识别增加了难度。针对多径环境下的调制识别问题,提出了一种基于改进的外积分解信道盲辨识算法的调制识别新算法。算法首先对信道进行基于改进算法的信道盲辨识和盲均衡,然后对均衡结果提取高阶累积量特征完成调制识别。与已有算法相比,改进的外积分解算法提高了在信道阶数过估计条件下对噪声的鲁棒性,所提出的调制识别算法扩大了识别种类,提高了识别性能。仿真结果证明了算法的有效性。Modulation identification becomes difficult because of the inter-symbol interference caused by the multi-path fadings. A new modulation identification algorithm based on the improved outer-product decomposition method was proposed for multi-path channels. The blind channel identification and blind equalization based on the improved method was first used. Then, the higher-order cumulant features of the equalized symbols were calculated for modulation identification. Comparing with the existing methods, the improved outer-product decomposition approach is robust to the noise when the channel is over-estimated, moreover, the modulation identification method can recognize more modulation types with higher performance. Simulation results prove the efficiency of the new identification algorithm.

关 键 词：信道盲辨识 盲均衡 调制识别 外积分解 高阶累积量 

分 类 号：TN911.72[电子电信—通信与信息系统]