脉冲噪声环境下的SCOT加权时间延迟估计新方法  

SCOT weighted time delay estimation method under impulsive noise environment

作　　者：孙永梅 邱天爽[1] 

机构地区：[1]大连理工大学电子与信息工程学院

出　　处：《通信学报》2005年第12期13-18,共6页Journal on Communications

基　　金：国家自然科学基金资助项目(30570475;60172072;60372081);辽宁省科学技术基金资助项目(2001101057)

摘　　要：针对平滑相干变换(SCOT)加权广义相关时间延迟估计方法在脉冲噪声环境下的退化现象,依据分数低阶α稳定分布噪声的尖峰脉冲特性和分数低阶统计量理论,提出了基于分数低阶协方差的SCOT加权时间延迟估计方法,并进一步提出了不依赖于分数低阶α稳定分布噪声参数估计的基于非线性变换(Sigmoid变换和反正切变换)的SCOT加权时间延迟估计方法。理论分析和计算机仿真结果表明,新方法在高斯和非高斯脉冲噪声环境下都具有良好的顽健性。The traditional smoothed coherence transform （SCOT） weighted time delay estimation degenerated under impulsive noise environment. A new time delay estimation method was proposed based on fractional lower order covariance according to the theory of the fractional lower order statistics and the impulsive characteristics of fractional lower order a -stable noises. Furthermore, in order to avoid the estimation of parameters of impulsive noises, alternative methods based on nonlinear transform were proposed. Theoretic analysis and computer simulations indicate that the new algorithms perform robustly under both Gaussian and non-Gaussian impulsive noise conditions.

关 键 词：信号处理 时间延迟估计 SCOT加权 分数低阶 非线性变换 

分 类 号：TN911.7[电子电信—通信与信息系统]