基于虚拟多通道的时间调制超表面DOA估计方案  

Virtual Multi-channel Direction of Arrival Estimation for Time-varying Metasurfaces

作　　者：陈明[1] 金梁[1,2] 许晓明 孙小丽 CHEN Ming;JIN Liang;XU Xiaoming;SUN Xiaoli(Information Engineering University,Zhengzhou 450001,China;National Engineering Research Center of Mobile Network Technologies,Beijing University of Posts and Telecommunications,Beijing 100876,China)

机构地区：[1]信息工程大学,河南郑州450001 [2]移动互联网安全技术国家工程研究中心,北京100876

出　　处：《信息工程大学学报》2025年第1期8-13,112,共7页Journal of Information Engineering University

基　　金：国家自然科学基金(U22A2001);嵩山实验室资助项目(221100211300-0X)。

摘　　要：针对现有时间维度波达方向(DOA)估计方案复杂度高和精度低的问题,提出一种基于虚拟多通道的时间调制超表面(TVM)DOA估计方案。该方案首先利用TVM的谐波效应,设计周期调制函数对入射信号进行调制,将单通道接收信号映射到多阶谐波之上,以此等价多通道接收信号;其次,设计正交方向图对信号进行接收,获得相互独立的虚拟多通道信号;最后,获得通过与调制函数相关的傅里叶系数矩阵估计出自相关矩阵,利用多信号分类(MUSIC)算法进行DOA估计。仿真结果表明,设计的DOA估计方案可以较好地实现单通道的DOA估计,能够最大程度逼近基于多通道阵列的DOA算法估计性能。To address the problems of high complexity and low accuracy associated with existing timedomain direction of arrival(DOA)estimation schemes,a novel approach based on virtual multi-channel in time-varying metasurface(TVM)is proposed.The harmonic properties of TVM are exploited in this method,with the incident signal being modulated by a periodic modulation function.This modulation maps the single-channel received signal to multiple harmonics,effectively equivalent to multichannel reception by distributing the single-channel signal across multiple harmonic orders.Subsequently,an orthogonal pattern is designed to receive the signal,resulting in the acquisition of mutually independent virtual multi-channel signals.The autocorrelation matrix is then estimated using the Fourier coefficient matrix related to the modulation function,and the multi-signal classification(MUSIC)algorithm is employed for DOA estimation.Numeric simulations have demonstrated the validity of the virtual multi-channel scheme.The performance of this approach closely approximates that of DOA estimation based on multi-channel arrays.

关 键 词：DOA估计 时间调制超表面 多信号分类算法 

分 类 号：TN911.7[电子电信—通信与信息系统]