自适应开环FIR滤波器抗窄带干扰方法研究
doi: 10.3724/SP.J.1146.2005.01182
Study on Open-Loop Adaptive FIR Filter Approach for Interference Suppression
-
摘要: 该文针对DSSS变换域抑制窄带干扰方法存在的不足，提出频域FFT干扰检测与时域自适应开环FIR陷波器相结合抑制窄带干扰的方法。给出了系统输出信噪比的解析表达式，并自适应地调整陷波器的零点位置和陷波幅度，使输出信噪比达到最优。仿真结果表明， 该方法在抗单音和多音干扰方面，性能均优于基于FFT加窗重叠处理的变换域抗干扰方法，并且结构简单、计算量小，是一种实用的抗干扰方法。
-
关键词:
- 干扰抑制;FIR陷波器;变换域
Abstract: A new approach for interference suppression in DSSS communication is introduced aim at the shortcomings of the method in transform domain. It combines interference detection in transform domain with interference suppression using open-loop adaptive FIR excision filtering in time domain. The expression of receiver signal-to-noise ratio is derived and it is maximized by adjusting filter coefficients depend on the interference power and its frequency information. The numerical simulation demonstrates that the proposed method is better than FFT method in transform domain in both single-tone and multi-tone interference environment and is effective and efficient to narrowband interferences. -
[1] Masry E. Closed-form analytical results for the rejection of narrow-band interference in PN spread spectrum systems-PartⅠ: Linear prediction filter[J].IEEE Trans. on Communications.1984, 32(8):888-896 [2] Masry E. Closed-form analytical results for the rejection of narrow-band interference in PN spread spectrum systems-PartⅡ: Linear prediction filter[J].IEEE Trans. on Communications.1985, 33(1):10-19 [3] Saulnier G J. Suppression of narrowband jammers in a spread spectrum receiver using transform domain adaptive filtering[J].IEEE J. on Selected Areas in Communications.1992, 10(4):742-749 [4] 李素芝. 时域离散信号处理. 长沙: 国防科技大学出版社, 1994, 第4.7节. [5] Ketchum J and Proakis J. Adaptive algorithms for estimating and suppressing narrowband interference in PN spread spectrum systems[J].IEEE Trans. on Communications.1982, 30(5):913-924 [6] Amin M G, Wang C, and Lindsey A R. Optimum interference excision in spread spectrum communications using open-loop adaptive filters[J].IEEE Trans. on Signal Processing.1999, 47(7):1966-1976 -
计量
- 文章访问数: 3276
- HTML全文浏览量: 76
- PDF下载量: 1001
- 被引次数: 0
下载:
