改进的小波模极大值降噪法在DS-UWB系统中的应用  

An improved denoising method of wavelet modular maximum for DS-UWB systems

作　　者：王毓东 朱晓明[1] 程东伟[1] 杨晓冬[1] 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001

出　　处：《应用科技》2008年第5期33-36,共4页Applied Science and Technology

摘　　要：由于超宽带脉冲信号持续时间短、发射功率低,传统去噪方法已不能很好地满足系统要求,而在超宽带系统中使用小波变换技术来抑制噪声时效果比较理想.通过对小波模极大值法进行改进,提出了一种新的去噪声方法——比值门限加相似系数法,它既能有效抑制噪声,又能保留UWB信号的奇异性.仿真结果表明,与模极大值法比较,该算法更简便,去噪效果更明显.Traditional denoising methods can not satisfy the requirements of the USB （ universal serial bus） system, because the duration time of the UWB （ ultra wide bard） pulse signals is short and the emitting power is low. But the wavelet transform technique is idealized to depress the noise. A new denoising method, the ratio threshold method with similar coefficients, is proposed based on wavelet modulus maximum method. It can not only effectively restrain the noise, but also reserve the singularity of UWB signals. Simulation shows the new method is simpler and more efficient in denoising than wavelet modular maximum method.

关 键 词：超宽带 小波变换 比值门限 去噪 

分 类 号：TN911.7[电子电信—通信与信息系统]