用小波变换的模极大值提取调制信号频率  

Extraction of Frequency from Modulated Signals by Modulus Maxima of Wavelet Transform

作　　者：曹毅[1] 蒋丽华[2] 

机构地区：[1]重庆大学生物工程学院,重庆400044 [2]重庆社会工作职业学院电子与信息技术系,重庆400055

出　　处：《微电子学》2005年第5期453-455,460,共4页Microelectronics

基　　金：云南省自然科学基金资助项目(2002C0002Z);云南省科技计划资助项目(2002PY10)

摘　　要：利用小波变换系数的模值与信号奇异性指数之间的关系,从调频信号中提取出调制信号的频率。其方法是:对调频信号进行小波变换,取适当尺度上的小波系数进行平方,得到小波变换模极大值的分布曲线,对该曲线进行小波强制滤波,得到反映调制信号频率的光滑曲线,计算该曲线的频率,即可得调制信号的频率。经过计算机仿真,证明该方法是可行的。Frequency of modulated signals is extracted from frequency-modulated signals by using the relationship between the modulus of wavelet transform coefficient and the singular exponent. In this method, wavelet transform of frequency-modulated signals is performed, and then, the wavelet transform coefficient on moderate scale is squared to obtain the distribution curve of modulus maxima of the wavelet transform, which is coercively filtrated, thus generating a smooth frequency curve of modulated signals. This method is validated by computer simulation.

关 键 词：小波变换 模极大值 调频信号 奇异性指数 

分 类 号：TN763[电子电信—电路与系统]