超宽带(Ultra Wide Band,UWB)无线通信系统由于极低的功率谱密度和很宽的频谱带宽特点,极易受到各种串入带内的窄带干扰的影响.面对复杂的干扰环境下,基于快速傅里叶变换的频域窄带干扰消除技术(Narrow-Band Inter-ference Cancellation,NBIC)是一个可靠的选择.其中,以连续均值去除(Consecutive Mean Excision,CME)算法作为干扰检测算法存在不足之处:由于判断迭代停止条件的不足,常因过度迭代导致有用信号谱线误消,降低信噪比.因此,提出了快速收敛CME(FC-CME)算法,通过统计每次干扰消除后的谱线平均幅度与上一次的差值,来提前停止门限迭代.仿真结果表明:FC-CME算法较CME算法的门限迭代次数更少,且干扰消除后的误码率更低.同时还提出了一种配合NBIC模块使用的稳健自启动机制,保证NBIC模块启动的鲁棒性.
Design and Implementation of Robust Self-Starting Fast Convergence CME Algorithm for UWB Narrow-Band Interference Cancellation Systems
Ultra Wide Band(UWB)wireless communication systems are highly susceptible to narrowband interference due to their very low power spectral density and ultra-wide bandwidth characteristics.In harsh environment full of hostile in-terferences,the frequency domain narrow-band interference cancellation(NBIC)based on fast Fourier transform is a reliable scheme to accomplish NBI cancellation.The consecutive mean excision(CME)algorithm as the interference detection has various shortcomings:due to the lack of judging the iteration stop condition,the useful signal spectral line is often mistak-enly eliminated due to excessive iteration,and the signal-to-noise ratio is reduced.Therefore,this paper proposes a fast convergent CME(FC-CME)algorithm to stop the NBIC iteration in advance by counting the difference between the average amplitude of spectral lines after each interference elimination and the last one.This paper also proposes a robust self-start-ing mode for NBIC module to ensure the robustness of NBIC module starting.
ultra wide bandinterference detection and eliminationconsecutive mean excisionfast convergence
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