摘要
威格纳分布被视为所有时频分布之母,其余的时频分布都可以看成是它的加窗形式,然而它固有的交叉项干扰是限制其广泛应用的最大问题之一。文中提出一种利用尺度图分布消除威格纳分布中交叉项干扰的方法,其中的尺度图分布计算基于Morlet小波,Matlab仿真结果表明,这种方法不仅可以有效地消除交叉干扰项,而且将小波变换对于低频信号的高频率分辨力和对于高频信号的高时间分辨力的优良特性引入威格纳分布,文中给出了理论分析和仿真图。
Winger distribution is considered to be mother of all types of time-frequency distribution, the rest of the time-frequency distribution can be regarded as its windowed form, however, one of the biggest programs that limit the broad application is its inherent cross-term interference. This paper proposed a method that is based on the scale map to eliminate cross-term interference in the Wigner distribution, scale map distribution computing is based on Morlet wavelet, matlab simulation results show that this method can not only effectively eliminate cross-interference terms, but also transform the good characteristics of wavelet transform to Wigner distribution, the good characteristics is the high-frequency resolution for the low-frequency signal and high time resolution for the high-frequency signals. It gives out the theoretical analysis and simulation plots.
出处
《信息技术》
2013年第5期140-143,共4页
Information Technology
关键词
威格纳分布
交叉项干扰
尺度图分布
Wigner distribution
cross-term interference
scale-map distribution
