扩频通信抗干扰中的局部离散余弦变换技术  

Local Discrete Cosine Transform to Interference Suppression in Spread Spectrum Communications

作　　者：朱丽平[1] 胡光锐[1] 单红梅[1] 

机构地区：[1]上海交通大学电子工程系

出　　处：《数据采集与处理》2004年第2期171-173,共3页Journal of Data Acquisition and Processing

基　　金：国家自然科学基金 ( 60 1 72 0 1 8)资助项目

摘　　要：提出一种新的基于局部离散余弦变换 ( Local discrete cosine transform,LDCT)的时频域干扰抑制方法。与传统的块变换 ( Discrete cosine transform,DCT)不同 ,LDCT基函数具有良好的时域能量集中特性 ,可迅速捕获信号中的时变成分 ,有效跟踪信号时频结构的变化 ,实现时频平面的任意时间分割。仿真结果表明 ,基于 LDCT的时频域信号处理方法可有效地抑制各种脉冲型时变干扰 ,明显改善系统性能。A new interference suppression technique based on local discrete cosine transform (LDCT) is proposed. Unlike traditional block transforms,such as the discrete cosine transform (DCT),the LDCT basis functions have good time-localized characteristics. The LDCT basis functions can realize arbitrary splitting of the time axis. The proposed scheme is capable of rapidly capturing the time varying components of the signal and tracking the variations of the signal time-frequency structure. Simulation results show that the technique is effective in suppressing various kinds of pulsed time-varying interferences,thus significantly improving the system performance.

关 键 词：扩频通信 抗干扰 局部离散余弦变换技术 变换域处理 

分 类 号：TN914.42[电子电信—通信与信息系统]