单天线的电磁辐射特性为全向。多天线组成的阵列,通过对各个振源的相位/时延的控制,实现了波束成形(beamforming),见下图。天线阵列的元素数目越大,波束的能量增益越大,波束越窄。
除了波束成形带来的能量增益以外,多天线阵列缔造了一个“空域”维度,获得了与时、频自由度并列的空域自由度(d.o.f.)。这使得多输入多输出(multiple-input multiple-output)系统可以获得数倍/数十倍于单输入单输出系统的频谱效率。
5G移动通信系统在sub-6G频段采用了中大规模MIMO:基站配备64-256振源的天线阵列,用空分多址(spatial division multiple access)同时服务十几个用户的数据流。因为用户数目K远小于天线数目N,简单的迫零MIMO检测/预编码即可保证系统顺利工作。
6G系统将面对显著增加的设备数目,即K将显著增加,达到甚至超过N。届时,已有的线性MIMO检测/预编码受限于其落后的干扰处理理念,将远远无法满足性能要求。课题组提出的基于格码的多址(LCMA)为解决这一为题提供了一个有竞争力的方案。
Associate Professor
Supervisor of Master's Candidates
E-Mail:
Date of Employment:2018-12-14
School/Department:School of Electronics Information Engineering
Administrative Position:Associate Professor
Education Level:博士研究生
Business Address:New Main building F929
Gender:Male
Contact Information:Wechat: 35771385 Email: Tyang@buaa.edu.cn
Degree:Doctoral Degree in Engineering
Status:Employed
Academic Titles:Core Member of Future Communication and Networking Promotion Group
Other Post:未来通信与网络推进组成员
Alma Mater:Beihang University, New South Wales University
Discipline:Information and Communication Engineering
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Honors and Titles:
Australian Research Council Discovery Early Career Researcher Award 2015
联邦科学研究院优秀论文奖 2013
澳大利亚国家研究生奖 2010
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