室内毫米波3D-MIMO无线信道参数提取与多径簇特性研究

Research on Indoor Millimeter Wave 3D-MIMO Wireless Channel Parameter Extraction and Multipath Cluster Characteristics

针对室内多用户场景毫米波三维多输入多输出(Three Dimensional Multiple Input Multiple Output,3DMIMO)无线信道测量不足、多径簇特性描述不完善的问题,本文基于测量研究室内毫米波3D-MIMO无线信道的参数提取算法和多径簇特性.首先,对室内多径传播条件下部署三个用户,开展了基于虚拟阵列的不同天线阵列大小的无线信道频域测量;然后,针对频域空间交替广义期望最大化(Frequency Domain Space-Alternating Generalized Expectation Maximization,FD-SAGE)算法不能描述3D-MIMO信道垂直域角度特性,以及时延分辨率不足的问题,改进算法增加了垂直维度,并且利用参数优先级迭代方法,提升毫米波3D-MIMO信道的时延域参数提取性能.结果表明改进算法既能准确地提取出毫米波3D-MIMO信道参数,又能实现随阵列大小增加而增加的多径簇内时延分辨率.

Aiming at the problems of insufficient measurement of three dimensional multiple input multiple output(3D-MIMO)wireless channel and incomplete description of multipath cluster characteristics in indoor multi-user scenarios,parameter extraction algorithm and multipath cluster characteristics of indoor millimeter wave3D-MIMO wireless channel are studied based on measurement.Three users are deployed in indoor multipath propagation,and wireless channel frequency domain measurements of different antenna array sizes based on virtual array are carried out.The problem that the frequency domain alternating generalized expectation maximization(FD-SAGE)algorithm cannot describe the vertical angular characteristics of3D-MIMO channel and the delay resolution is insufficient.Improved algorithm adds the vertical dimension,and uses the iterative method of parameter priority to improve the delay domain performance of parameter extraction in millimeter wave3D-MIMO channel.The results show that the improved algorithm can not only extract millimeter wave3D-MIMO channel parameters accurately,but also achieve the time-delay resolution in multipath cluster with the increase of array size.