摘要
直接序列超宽带(DS-UWB)信号的脉冲持续时间极短,信号以极低的功率谱密度分布在很宽的频带上。热噪声成为主要干扰源,传统射频滤波只能去除带外噪声。文中基于DS-UWB信号的奇异性分析,利用小波变换模极大值法进行带内滤波。仿真结果表明,该方法能有效地保留信号的奇异点信息,突显信号的细节特征,降噪效果明显。
The pulse duration of direct-sequence ultra-wideband （DS-UWB） signal is very short, and the signal is distributed over a very wide frequency band with very low power spectral density. Thermal noise becomes the major source of interference, and the traditional RF filter could only remove the out-band noise. Based on DS-UWB signal singularity analysis, this article proposes a denoising method of Wavelet transform modulus maxima in signal band. Simulation results indicate that this method could effectively retain singularity of the signal, and the effect of denoising is remarkable.
出处
《通信技术》
2010年第1期14-16,19,共4页
Communications Technology
