Astudy of uplink and downlink channel spatial characteristics in an urban micro scenario at 28GHz  

作　　者：Tao JIANG Jianhua ZHANG Pan TANG Lei TIAN 

机构地区：[1]State Key Lab of Networking and Switching Technology,Beijing University of Posts and Telecommunications,Beijing 100876,China

出　　处：《Frontiers of Information Technology & Electronic Engineering》2021年第4期488-502,共15页信息与电子工程前沿（英文版）

基　　金：Project supported by the Outstanding Youth Fund of National Natural Science Foundation of China(No.61925102);the National Key R&D Program of China(No.2020YFB1805002);the National Natural Science Foundation of China(No.62031019);the BUPT-CMCC Joint Innovation Center。

摘　　要：This paper presents an empirical study of the uplink and downlink azimuth angle of arrival(AoA)in an urban micro(UMi)scenario at 28 GHz.At present,most UMi measurements are conducted in the downlink and then the uplink situation is inferred assuming channel reciprocity.Although the channel correlation coefficient of the uplink and downlink can be as high as 0.8,this does not mean that they are the same.Only a real uplink measurement can accurately describe its channel conditions,and this is what this study does.A receiver equipped with a rotatable horn antenna is mounted at the base station and the user terminal,respectively,in simulating the uplink and downlink.To improve the angular resolution,we extract the multipath components(MPCs)using the space-alternating generalized expectation-maximization algorithm.Also,a spatial lobe approach is used to cluster the MPCs in the power angular spectrum.By matching MPCs with objects in the environment,we find that direct propagation and first-order reflections are dominant in line-of-sight and non-line-of-sight cases.By comparing our measurement with those in standard channel models,we verify that the AoA of clusters follows a Gaussian distribution in the uplink and downlink.In addition,a two-dimensional Gaussian distribution for ray AoA and power is established to reflect their correlation.

关 键 词：Channel measurements Millimeter-wave(mmWave) UPLINK DOWNLINK Azimuth angle of arrival 

分 类 号：TN929.53[电子电信—通信与信息系统]