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应用科学学报

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改进子空间跟踪算法的直扩通信系统抗干扰

梅 阳， 张尔扬   

  1. 国防科学技术大学 电子科学与工程学院，湖南 长沙 410073
  • 收稿日期:2007-09-12 修回日期:2007-12-05 出版日期:2008-07-31 发布日期:2008-07-31

Rejection of Narrow-Band Interference Based on Improved RRLS Algorithm in DSSS Communication Systems

MEI Yang, ZHANG Er-yang
  

  1. College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China
  • Received:2007-09-12 Revised:2007-12-05 Online:2008-07-31 Published:2008-07-31

被引次数

4

摘要： 在深入研究基于特征分析的干扰抑制方法的基础上,先对特征相消器的权矢量进行简化，然后提出一种改进算法——正交稳健最小递归二乘（ORRLS）算法来实现特征相消器。ORRLS算法可以保证所得特征矢量矩阵具有正交性，还可以自适应地估计子空间维数。理论分析和仿真试验表明，ORRLS算法在强干扰的情况下，仍能稳健地收敛，更适合于直接序列扩频系统中的干扰抑制。

关键词: 直接序列扩频, 抗窄带干扰, 特征相消器, 子空间跟踪算法, 正交稳健的RLS算法

Abstract: By investigating narrow-band interference suppression based on eigenanalysis in direct sequence spread spectrum (DSSS) communication systems, this paper simplifies the weight vector of eigencanceller. An improved algorithm, orthonormal robust recursive least square (ORRLS) algorithm is proposed to realize the eigencanceller. ORRLS algorithm can guarantee orthonormality of the weight matrix in iteration. Moreover, it can track the rank of interference subspace. Theoretic analysis and simulation indicate that the ORRLS algorithm can converge robustly when the interferences are very strong. It is suitable to reject narrow-band interferences in DSSS communication systems.

Key words: DSSS, narrow-band interference suppression, eigencanceller, subspace tracking algorithm, orthonormal robust recursive least square algorithm