稳定分布下基于FAM的低阶循环谱算法研究  

The Realization of Low Order FAM Method Under α Stable Distribution

作　　者：何继爱[1] 裴承全[1] 郑玉峰[1,2] 

机构地区：[1]兰州理工大学计算机与通信学院,甘肃兰州730050 [2]西北工业大学航海学院,陕西西安710072

出　　处：《电子学报》2013年第7期1297-1304,共8页Acta Electronica Sinica

基　　金：国家自然科学基金(No.61265003);甘肃省自然科学基金(No.1014RJZA011)

摘　　要：该文在α稳定分布下结合共变理论、循环平稳和分数低阶矩(FLOM)等理论和方法,提出基于FAM(FFT Accumulation Method)的低阶循环谱算法,对算法中存在的循环泄露现象及算法复杂度进行了分析,并以调制信号(AM,QPSK)做了实验仿真.结果表明在α稳定分布下循环平稳信号的低阶循环谱密度和在高斯模型下的二阶循环谱结构是一致的,但基于α稳定分布假定所设计的信号处理算法对信号噪声特性不确定情况具有较好的韧性和抗脉冲噪声性能.最后在循环谱域构造了调制信号的低阶循环特征参数,为复杂背景下的调制识别提供了新的途径.In this paper,a new method which combines with covariation,cyclostationarity and FLOM for calculating low order spectrum based on FAM（FFT Accumulation Method） was proposed and the simulations were made for modulated signals（AM,QPSK）,and finally the cycle leakage and complexity of this method were analyzed.The result under α stable distribution shows that the spectrum instruction of two order cyclostationary signals is the same as under Gauss model.However,the methods constructed under stable distribution have better performance of anti-noise than under Gauss model.The low order cycle characteristic parameters are constructed in the field of cycle spectrum and a new method is given for modulation recognition and blind separation in complex environment.

关 键 词：Α稳定分布 分数低阶矩 FAM 高斯模型 

分 类 号：TN911.7[电子电信—通信与信息系统]