CFE下FRESH滤波器性能分析及CFE校正

魏安全; 沈连丰

doi:10.3724/SP.J.1146.2006.01408

CFE下FRESH滤波器性能分析及CFE校正

doi: 10.3724/SP.J.1146.2006.01408

魏安全^{①②;沈连丰},
沈连丰

基金项目:

国家自然科学基金(60472053)，江苏省自然科学基金(BK2003055)和高等学校博士点专项科研基金(20030286017)资助课题

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出版历程
- 收稿日期: 2006-09-18
- 修回日期: 2007-07-19
- 刊出日期: 2008-04-19

Performance Analysis of FRESH Filter under CFE and Correction of CFE

Wei An-quan^{①②;沈连丰},
Shen Lian-feng

摘要

摘要: 频移(FRESH)滤波器的研究通常都基于接收机准确知道信号或干扰循环频率(CF)的假设，但在FRESH滤波器的实际应用环境中，循环频率误差(CFE)往往不可避免地存在。该文基于FRESH滤波器抑制DSSS/BPSK系统窄带干扰的模型，分析了CFE对FRESH滤波器抽头系数、估计误差和系统误码性能的影响，提出了一种改进的CFE校正算法。理论分析与数值仿真的结果表明，FRESH滤波器的性能对CFE十分敏感，该文提出的算法能有效地校正CFE，使FRESH滤波器在CFE下仍能保持稳健而优良的性能。
- 频移滤波器; 循环平稳; 谱相关; 循环频率误差; 干扰抑制
Abstract: The researches of FREquency-SHift (FRESH) filter are usually based on the hypothesis that the receivers precisely know the cycle frequencies of signal or interference. However, in the practical application circumstances of FRESH filter, Cycle Frequency Error (CFE) sometimes exists unavoidably. Based on the model of DSSS/BPSK system with FRESH filter to suppress narrow-band interference, the tap coefficients, the estimate error of FRESH filter and the system bit error performance under CFE are analyzed and an improved CFE correction algorithm is proposed in this paper. The results from theoretical analysis and numerical simulations indicate that the performance of FRESH filter is very sensitive to CFE, and the proposed algorithm can correct CFE effectively, keeping FRESH filter robust and excellent under CFE.

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