多级维纳降秩频移滤波器在直扩系统中的抗干扰应用

Rejection of Narrow-Band Interferences in DSSS Communication Systems Using FRESH filter Rank-Reduced by MSWF

直扩系统中,采用频移滤波器作为白化滤波器,利用了窄带干扰的循环平稳特性,可得到比传统线性时不变滤波器更好的抗干扰效果。本文把多级维纳滤波算法应用到频移滤波器中。理论分析和仿真表明,利用多级维纳滤波算法,频移白化滤波器在低秩条件下,仍可以得到很好的抗干扰效果。

In DSSS communication systems,FRESH filter which exploits cyclostationarity property of narrowband Interference, is applied to suppress narrowband interference as whiten filter. It can achieve a better performance than the conventional LTL filter. This paper uses the algorithm of MSWF in FRESH filter. Theoretical analysis and simulation results show FRESH filter rank-reduced by MSWF can get a good performance of interference suppression.