【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。更多还原

【Abstract】 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.更多还原