基于改进近邻传播算法的Walsh软扩频盲解扩方法  

Blind Despread Method of Walsh Soft Spread Spectrum Based on Improved Affinity Propagation Algorithm

作　　者：李丞 张玉 LI Cheng;ZHANG Yu(School of Electronic Countermeasures,National University of Defense Technology,Hefei 230037,China)

机构地区：[1]国防科技大学电子对抗学院,合肥230037

出　　处：《火力与指挥控制》2019年第3期77-81,共5页Fire Control & Command Control

摘　　要：针对现代二次雷达系统通信中存在的Walsh软扩频难以盲解扩问题,借鉴常规扩频解扩方法及聚类分析,提出了一种基于近邻传播算法的Walsh软扩频盲解扩方法。该方法首先对接收信号进行采样得到目标结构数据集合,并根据统计量估计得出信号时延。然后采用改进近邻传播算法进行伪码集合估计,并得到聚类中心从而得到伪码集合。最后利用已知的Walsh码和信息码的映射关系得到信息序列,完成盲解扩问题。仿真结果表明,在白噪声条件下,可有效解决Walsh软扩频盲解扩问题,性能较同类算法均有提升并降低算法复杂度。Facing the problem of blind despreading method of Walsh soft spread spectrum in modern second suiveillance radar,using usual despreading method and clustering analysis,a blind despreading method of Walsh soft spread spectrum based on improved affinity propagation algorithm.Firstly,the method structure the data collection by means of sampling objects,and estimate the delay time based on the test statistic.Then the algorithm estimates the scale of pseudo-code collection by the improved affinity propagation algorithm.And the pseudo-code collection is gotten from the clustering center of class after merging.Finally,the method obtains the information sequence by relationship between the Walsh code and information code. The simulation result shows that the method can solve the blind despread of Walsh soft spread spectrum,outperform other algorithms,and reduce the complexity by comparing with other methods.

关 键 词：Walsh软扩频 盲解扩 伪码 近邻传播算法 

分 类 号：TN914.42[电子电信—通信与信息系统]