电讯技术2017，Vol.57Issue(11)：1307-1312,6.DOI:10.3969/j.issn.1001-893x.2017.11.014
基于快速OPAST算法的直扩信号PN码序列估计
Estimation of PN Code Sequence of DSSS Signal Based on Fast OPAST Algorithm
摘要
Abstract
In direct sequence spread spectrum ( DSSS) communication countermeasure systems,the blind es-timation of pseudo-noise ( PN) sequence is an important research subject. A blind estimation approach of PN code sequence is proposed based on fast orthogonal projection approximation subspace tracking( OPAST) al-gorithm and sliding window technique,thus solving the problem that the weight vector does not converge in some cases. The main eigenvector is extracted by OPAST algorithm,and sliding window technique is used to realize the code synchronization when the received DSSS signals are asynchronous and divided by wide win-dows. It guarantees the orthonormality of the weight vector at each iteration and fast convergence properties, and also solves phase ambiguity. It has the advantage of lower complexity,less storage and easier realization in hardware and real-time processing. Simulations show that the proposed algorithm can estimate the PN code sequence effectively and accurately in low signal-to-noise ratio( SNR) condition(-10 dB) .关键词
直接序列扩频/通信对抗/伪码序列估计/快速OPAST算法/滑动窗/码同步Key words
direct sequence spread spectrum ( DSSS)/communication countermeasure/pseudo-noise se-quence estimation/fast orthogonal projection approximation subspace tracking ( OPAST )/sliding window/code synchronization分类
信息技术与安全科学引用本文复制引用
王猛,李迟生,罗伟娟..基于快速OPAST算法的直扩信号PN码序列估计[J].电讯技术,2017,57(11):1307-1312,6.基金项目
国家自然科学基金资助项目(61661030) （61661030）
江西省自然科学基金资助项目(20151BAB207006) （20151BAB207006）
