基于改进倒谱的直扩信号伪码周期估计的研究  

Research on the method of pseudo code period estimation for DSSS signals based on improved cepstrum

作　　者：钟思惠 余小平[1] 侯影 贾岚絮 刘军 杨晶富 ZHONG Si-hui;YU Xiao-ping;HOU Ying;JIA Lan-xu;LIU Jun;YANG Jing-fu(Chengdu University of Technology College of Information Science and Technology,Chengdu 610059,China)

机构地区：[1]成都理工大学信息科学与技术学院,成都610059

出　　处：《信息技术》2021年第7期98-102,108,共6页Information Technology

摘　　要：扩频因其良好的保密性被广泛应用于各领域,在非协作条件下对扩频信号解扩则需要进行参数估计。针对直扩信号在低信噪比情况下采用传统倒谱法估计伪码周期性能陡然下降,以及传统倒谱中周期图谱法会造成频谱泄漏的问题,提出了一种基于延迟相乘与Marple算法的Yule-Walker自回归功率谱的倒谱法。通过MATLAB仿真分析,该方法能够提升伪码周期分量幅度,增强噪声抑制能力,避免频谱泄漏。Spread spectrum is widely used in various fields due to its good confidentiality,and parameter estimation is required to despread the spread spectrum signal under non-cooperative conditions.Regarding the problem that the period performance of the traditional cepstrum method is used to estimate the PN sequence abruptly declines in the low signal-to-noise ratio of the DS signal,and the period map method in the traditional cepstrum method would cause spectrum leakage,a Yule-Walker autoregressive cepstrum method based on delay-multiply and Marple algorithm is proposed.Through MATLAB simulation analysis,this method can increase the amplitude of the PN sequence periodic component,and enhance the noise suppression ability while avoiding spectrum leakage.

关 键 词：延迟相乘 Marple算法 Yule-Walker自回归功率谱 倒谱 伪码周期估计 

分 类 号：TN911[电子电信—通信与信息系统]