基于并行滤波器组和高阶累积量的扩频信号检测与估计  

Detection and Estimation of the Spread Spectrum Signal Using Parallel filter banks and High-Order Cumulants

作　　者：罗军辉[1] 姬红兵[1] 刘唐兴[1] 

机构地区：[1]西安电子科技大学电子工程学院,西安710071

出　　处：《系统仿真学报》2009年第4期958-961,共4页Journal of System Simulation

基　　金：国防预研基金资助(J14106020101)

摘　　要：在非协作通信截获中,提出了一种有效的基于并行滤波器组和三阶累积量的扩频信号检测方法。滤波器组将输入信号细划成许多窄的频率通带,不仅在时频域完整的描述了未知信号,也改善了输出信噪比。采用三阶累积量估计器进一步抑制高斯噪声,并保留信号的有用信息,提高算法的检测能力。最后通过创建特征矩阵,实现扩频信号的参数估计。仿真实验表明,算法适用于低信噪比下的直接序列扩频扩信号检测,并能有效估计截获信号的载频和调制带宽。In interception of the non-cooperation communication, a new effective method based on the parallelfilter banks and high-order cumulants was proposed for spread spectrum signal detection. The filter banks split the input signal into many narrow frequency bands, which not only can completely descript unknown signals in the time-frequency domain, but improve the signal-to-noise ratio （SNR）. Moreover, Gaussian noises can be suppressed using the three-order eumulants, which can preserve more useful information and boost the detection performance. Then parameters of the unknown signal were obtained by creating the feature matrix. The simulation indicates that it is effective for this technique to detect the direct sequence spread spectrum （DS-SS） signal and estimate the carrier frequency and the bandwidth under low SNR.

关 键 词：扩频信号 并行滤波器组 三阶累积量 信号检测 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]