摘要
推导了常用数字调制信号的小波变换幅度函数表达式,并给出了统一的近似表达式。在此基础上给出了单通道接收混合信号模型中小波变换幅度函数的近似表达式。通过充分利用与混合信号中奇异点有关的码元周期信息,给出一种基于小波变换的单通道接收条件下源信号数目估计算法,实现了在无先验知识的情况下对源信号数目的估计,并通过仿真验证了算法的可行性和有效性。
The expression of amplitude of the wavelet transform of several digital modulated signals is derived, and the uniform approximate expression is given. And the approximate expression of amplitude of the wavelet transform in the single channel condition is also given. By using the information about symbol rate which is related to singular points in the received signal, a new single channel source number estimation algorithm is proposed based on the wavelet trans- form, without any prior knowledge. Finally, the simulation result proves feasibility and efficiency of this algorithm.
出处
《科学技术与工程》
北大核心
2012年第20期5039-5043,共5页
Science Technology and Engineering
关键词
源信号数目估计
小波变换
奇异点检测
source number estimation wavelet transform singular point detection
