脉冲噪声环境下基于分数低阶循环相关的直扩信号检测方法
首发时间:2009-01-04
摘要:研究了alpha稳定分布噪声对传统的二阶循环统计量的影响,利用分数低阶相关对传统的二阶统计量进行了广义化,提出了一种基于分数低阶循环统计量的直扩信号检测方法。计算机仿真表明,该方法可有效的抑制高斯噪声和脉冲噪声的干扰,在未知信号先验信息的情况下实现对直扩信号的可靠盲检测。该算法在低信噪比的情况下保持了良好的检测效果,仿真结果证明了其性能优于基于二阶循环统计量的检测方法。
关键词: 直扩信号检测 分数低阶循环相关 循环平稳 alpha稳定分布
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A DS-SS signal detection method based on the fractional lower order cyclic correlation in impulsive noise environment
Abstract:Considering the effect of alpha-stable distributed noises to the classical second order cyclic statistics, based on the fractional lower order cyclic statistics which generalized the second order one, a novel DS-SS Signal Detection Method was developed. Simulations show the proposed algorithm can perform blind detection without a prior knowledge of signal and noise. The algorithm can restrain the interference of Gaussian and impulsive noises as well. Simulations also demonstrate that the performance of the proposed algorithm is superior to that of the second order cyclic statistics in low SNR environment.
Keywords: direct sequence spread spectrum signal detection fractional lower ordercyclic correlation cyclostationarity alpha-stable distribution
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