小波变换域通信系统中连续均值剔除算法  

Research on Consecutive Mean Excision Algorithm in Wavelet Domain Communication System

作　　者：徐兵政 任清华[1,2] 孟庆微[1] 刘洋[1] XU Bingzheng;REN Qinghua;MENG Qingwei;LIU Yang(Information and Navigation College,Air Force Engineering University,Xi＇an 710077,China;CETC Key Laboratory of Aerospace Information Applications,Shijiazhuang 050081,China)

机构地区：[1]空军工程大学信息与导航学院,西安710077 [2]中国电子科技集团公司航天信息应用技术重点实验室,石家庄050081

出　　处：《空军工程大学学报（自然科学版）》2018年第4期93-98,共6页Journal of Air Force Engineering University(Natural Science Edition)

基　　金：国家自然科学基金(61401499);航天信息应用技术重点实验室高校合作课题(KX162600022)

摘　　要：针对小波变换域通信系统与基于频域的变换域通信系统基函数生成方式不同而带来的难以有效剔除干扰的问题,将向后连续均值剔除算法(CME)和向前连续均值剔除算法(FCME)引入小波变换域通信系统幅度谱成型模块。2种算法将小波变换域分为干扰子带和噪声子带两部分,利用连续迭代、逐次逼近的递归方法自适应地计算相应门限阈值,从而对不同类型的干扰进行有效剔除,无需对噪声功率进行估计。仿真结果表明:在强干扰情况下,2种算法对系统误码率的改善具有明显优势,并且在音频干扰的情况下,CME算法抗干扰性能增益要优于FCME算法;在窄带干扰的情况下,FCME算法抗干扰性能增益要优于CME算法;在线性调频干扰的情况下,2种算法抗干扰性能增益接近。Aimed at the problems that in wavelet domain communication system,the traditional generation method of basis function is different from Transform Domain Communication System based on frequency domain,and the traditional threshold decision algorithm is difficult to eliminate the interference effectively in wavelet domain communication system,Consecutive Mean Excision（CME）algorithm and Forward Consecutive Mean Excision（FCME）algorithm are introduced into amplitude spectrum shaping module of wavelet domain communication system.The two algorithms divide the wavelet transform domain into two parts,i.e.the interference sub-band and the noise sub-band.They utilize the recursive method of continuous iteration and successive approximation for calculating the threshold adaptively,effectively eliminating different types of interference without estimation of the noise power.The simulation results show that these two algorithms are prior to the traditional threshold algorithm under the condition of strong interference.And in the case of audio interference,the anti-interference performance of CME algorithm is superiorto FCME;in the case of narrowband interference,the anti-interference performance of FCME algorithm is better than that of CME;and in the case of linear frequency modulation jamming,the two algorithms behave close to each other.

关 键 词：小波变换 变换域通信系统 连续均值剔除算法 门限判决 

分 类 号：TN925[电子电信—通信与信息系统]