基于IIR滤波器的窄带干扰抑制技术仿真与实现  

Simulation and Realization of Narrow-band Interference Suppression Technology Using IIR Filter

作　　者：张平华[1] 朱运航[1] 

机构地区：[1]湖南信息职业技术学院,湖南长沙410200

出　　处：《中国集成电路》2012年第4期51-56,共6页China lntegrated Circuit

基　　金：湖南省教育厅资助科研项目:通信系统电磁干扰及其控制方法研究(09C1259)

摘　　要：研究了直扩通信中二阶自适应格型IIR陷波滤波器在抗窄带干扰中的应用,推导了系统信噪比改善因子和误比特率的闭合表达式,分析了算法的性能,并进行了MATLAB仿真。基础上,设计了FPGA可实现的自适应解扩重扩滤波器,该滤波器实现简单,硬件测试表明,滤波器达到了预期的性能指标,有效可抗窄带干扰在大约21dB。An application of a second-order adaptive lattice IIR notch filter for rejection of NBI in direct sequence spread spectrum system（DSSS） is studied.Closed-form analytical expressions for signal-to-noise ratio（SNR） improvement factor and bit error ratio（BER） of the system are derived.The performances of the algorithm have been researched and simulated in MATLAB.The adaptive filter is designed and implemented on FPGA,which is simple to realize.It is shown by the test on hardware circuit that the filter had a capacity of about 21dB for NBI rejection which satisfies the requirement.

关 键 词：直扩通信 窄带干扰 FPGA 

分 类 号：TN914.42[电子电信—通信与信息系统]