基于聚焦矩阵的毫米波信号DOA估计  

DOA estimation of millimeter wave signal based on focusing matrix

作　　者：苗丰满[1,2] 车凯琪 李佑宇 MIAO Feng-man;CHE Kai-qi;LI You-yu(School of Computer and Communication, Lanzhou Univ. of Tech., Lanzhou 730050, China;GCIGC Culture and Tourism Development Group Corporation, Lanzhou 730050, China;School of Computer Science and Artificial Intelligence, Lanzhou Institute of Technology, Lanzhou 730050, China)

机构地区：[1]兰州理工大学计算机与通信学院,甘肃兰州730050 [2]甘肃建投文化旅游发展集团有限公司,甘肃兰州730050 [3]兰州工业学院计算机与人工智能学院,甘肃兰州730050

出　　处：《兰州理工大学学报》2020年第5期107-112,共6页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(61461026,61841107)。

摘　　要：针对毫米波信号源的到达角(DOA)估计随频率变化、导致估计误差较大的问题,提出毫米波信号向窄带信号转化的DOA估计算法.该算法通过在频域内建立毫米波信号接收模型,将接收信号看成多个不相关的窄带信号,并将其“聚焦”在某一参考频率下,减少波束因频率变化带来的影响,进而利用旋转不变子空间(ESPRIT)算法进行毫米波DOA估计.仿真结果表明:该算法可有效降低中等信噪比下的DOA估计误差,当阵元数达到70时,可实现相对稳定的DOA估计,随频率变化估计效果保持整体稳定,从而提升毫米波系统定向传输时的链路质量.The angle of arrival(DOA)estimation of millimeter-wave signal source varies with frequency,which leads to large estimation error.A DOA estimation algorithm for millimeter-wave signal conversion to narrowband signal is proposed in this study.By establishing a millimeter wave signal reception model in the frequency domain,the proposed algorithm treats receiving signals as multiple unrelated narrowband signals and“focuses”them on a reference frequency in order to reduce the impact of the beam due to frequency changes,and then uses the ESPRIT algorithm to make millimeter wave DOA estimation.The simulation results show that the proposed algorithm may effectively reduce the DOA estimation error under moderate signal-to-noise ratio.When the number of array elements reaches 70,a relatively stable DOA estimation can be achieved,which can improve the link quality for directional transmission of millimeter-wave systems.

关 键 词：毫米波 DOA 窄带模型 聚焦 ESPRIT算法 

分 类 号：TN928[电子电信—通信与信息系统]