UFMC系统中基于阈值的改进DFT信道估计算法  

Improved Channel Estimation Algorithm Based on DFT in UFMC System

作　　者：陈雷[1] 郝玉莲 刘帅奇[1] 张锁良[1,2] CHEN Lei;HAO Yu-lian;LIU Shuai-qi;ZHANG Suo-liang(College of Electronic and Information Engineering,Hebei University,Baoding Hebei 071000,China;Machine Vision Technology Innovation Center of Hebei Province,Baoding Hebei 071000,China)

机构地区：[1]河北大学电子信息工程学院,河北保定071002 [2]河北省机器视觉技术创新中心,河北保定071000

出　　处：《计算机仿真》2024年第5期338-342,414,共6页Computer Simulation

基　　金：国家自然科学基金(62172139);企事业单位委托科技项目(横20190079)。

摘　　要：针对通用滤波多载波(Universal Filtered Multi-Carrier,UFMC)系统中传统的基于离散傅里叶变换(Discrete Fourier Transform,DFT)的信道估计算法存在噪声区间不连续、信道长度内噪声消除不彻底、信号经DFT运算后频谱泄露高等问题,提出一种基于阈值的改进DFT信道估计算法。算法在频域通过加窗以降低信道冲激响应(Channel Impulse Response,CIR)能量泄露,在时域通过设置阈值和指数平滑可最大限度滤除样本内噪声。理论分析与仿真结果表明,与传统的DFT估计算法相比,所提算法误比特率(Bit Error Ratio,BER)更低,在高信噪比下有1.5 dB左右的性能提升,能够进一步减少噪声对系统性能的影响,可有效提高信道估计的准确度。Based on the Discrete Fourier Transform in Universal Filtered Multi-Carrier(UFMC)systems,the channel estimation algorithm of DFT has some problems,such as discontinuous noise interval,incomplete noise elimination in channel length and high spectrum leakage after DFT operation.An improved channel estimation algorithm based on DFT is proposed.In the frequency domain,a window is added to reduce the energy leakage of Channel Impulse Response(CIR),and in the time domain,the in-sample noise can be filtered to the maximum by setting thresholds and exponential smoothing.Theoretical analysis and simulation results show that compared with traditional DFT estimation algorithms,the proposed algorithm has a lower Bit Error Ratio(BER)and a performance improvement of about 1.5 dB under high SNR,which can further reduce the impact of noise on system performance and effectively improve the accuracy of channel estimation.

关 键 词：通用滤波多载波 离散傅里叶变换 信道冲激响应 阈值 指数平滑 

分 类 号：TN929.5[电子电信—通信与信息系统]