CFE下FRESH滤波器性能分析及CFE校正  

Performance Analysis of FRESH Filter under CFE and Correction of CFE

作　　者：魏安全[1] 沈连丰[1] 

机构地区：[1]东南大学移动通信国家重点实验室

出　　处：《电子与信息学报》2008年第4期853-858,共6页Journal of Electronics & Information Technology

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

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。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.

关 键 词：频移滤波器 循环平稳 谱相关 循环频率误差 干扰抑制 

分 类 号：TN911.7[电子电信—通信与信息系统]