毫米波信道中波束成形矢量的波束宽度  

Beamwidth of beamforming vectors in millimeter-wave channels

作　　者：楼斌剑 王海泉[1] 黄怡[1] 李紫薇 俞芸芸 LOU Binjian;WANG Haiquan;HUANG Yi;LI Ziwei;YU Yunyun(Hangzhou Dianzi University,Hangzhou 310018,China)

机构地区：[1]杭州电子科技大学,浙江杭州310018

出　　处：《电信科学》2022年第11期47-56,共10页Telecommunications Science

摘　　要：波束成形矢量技术能够集中所发送的能量于某一指定区域,从而提高系统性能,是5G的核心技术之一。但正是由于能量被集中这一特点,信道的任何变化都可能会使接收方越出此特定区域,从而使系统的鲁棒性能降低。波束成形矢量的波束宽度这一概念就是衡量这对矛盾的指标之一。已有的波束宽度大多针对天线而言,并非针对波束成形矢量。针对波束成形矢量,借助格拉斯曼流形中的概念,给出并研究了波束宽度的定义,在此基础上,探讨了拓宽波束宽度的方法。研究发现,天线数越多,能量越能够集中,但波束宽度受限,从而鲁棒性越弱。The beamforming technology is one of the core technologies in 5G and it can concentrate the transmitted energy in a specified area,thereby improving the performance of the system.But it is because of this feature that the energy is concentrated,any changes of the channel may cause to keep the receiver outside the specified area,and therefore,the performance of robustness is reduced.The concept of the beam width of a beamforming is one of the indicators to measure this tradeoff.Existing definition of beam widths are based on antennas,not on beamforming.Interms of beamforming,the definition of beam width was given and studied with the help of the concept in Grassmannian manifolds.On this basis,the method of beam width was discussed.It is found that the beam width of beamforming is closely related to the number of the transmitting antennas.The more the number of antennas,the more concentrated the energy,and the weaker robustness is.

关 键 词：毫米波 波束成形 波束宽度 格拉斯曼流形 波束拓宽 

分 类 号：TN91[电子电信—通信与信息系统]