摘要
为解决扩频通信系统中存在的多址干扰问题,将卷积小波包变换引入了扩频系统的降噪处理过程。探讨了干扰噪声在卷积小波包变换中的传播特性,在此基础上讨论了卷积小波包变换降噪的算法步骤,详细讨论了干扰噪声方差估计和阈值函数处理的方法。对几种常用的信号类型进行了仿真计算,仿真结果表明该方法不但能提高扩频通信系统的降噪精度,还可较好保留信号中的主要细节。
In order to solve the multi-address interference problem in spread frequency system,convolution wavelet packet transform is introduced in noise reducing process.The article discusses the transmitting characteristic of interference noise in convolution wavelet packet transform and arithmetic steps,based on which the variance estimation of interference noise and threshold function disposal are probed in.Four types signal are simulated,the simulation results indicates that the method is not only able to improve the accuracy of noise reducing,but also able to keep the main detail of the signals.
出处
《舰船电子工程》
2010年第8期101-103,182,共4页
Ship Electronic Engineering
关键词
卷积小波包变换
扩频通信系统
干扰消除
convolution wavelet packet transform
SS
interference elimination
