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基于相控阵天线的空分复用技术及其容量分析
杨亦韬,马正新,王毓晗,刘含宇
0
(1.清华大学 电子工程系,北京 100084;2.北京邮电大学 计算机学院,北京 100876)
摘要:
无人机中继下行方式大多为时分复用(Time Division Multiplexing,TDM)。在TDM以时间资源划分用户的基础上,吸收现有的多波束通信系统的思想,利用相控阵天线技术引入空间资源,提出了一种基于点波束指向逐包快速调整的空分复用(Space Division Multiplexing,SDM)技术。该SDM技术根据数据包的目的地址实时调整点波束天线的指向,在所有波束使用相同频率、相同带宽、相同调制方式的情况下,中心站利用数量较少的波束与大量用户站的通信。在加性高斯白噪声(Additive White Gaussian Noise,AWGN)信道下,通过计算和仿真分析验证了新型的SDM下行方式相对于TDM下行方式能够极大提高下行的信道容量。
关键词:  无人机中继  空分复用  时分复用  波束指向逐包快速调整  下行信道容量
DOI:
基金项目:
Space Division Multiplexing Technology Based on Phased Array Antenna and Its Capacity Analysis
YANG Yitao,MA Zhengxin,WANG Yuhan,LIU Hanyu
(1.Department of Electronic Engineering,Tsinghua University,Beijing 100084,China;2.School of Computer Science,Beijing University of Posts and Telecommunications,Beijing 100876,China)
Abstract:
Most of the unmanned aerial vehicle(UAV) relaying mode is time division multiplexing(TDM).In this paper,based on the time division of users by TDM,the idea of absorbing existing multi-beam communication systems is adopted,and space resources are introduced by phased array antenna technology,a space division multiplexing(SDM) technology based on point beam pointing and packet-by-packet fast adjustment is proposed.The SDM technology adjusts the pointing of the spot beam antenna in real time according to the destination address of the data packet.When all beams use the same frequency,the same bandwidth,and the same modulation mode,the central station uses a small number of beams to communicate with a large number of user stations.In additive white Gaussian noise(AWGN) channel,the calculation and simulation analysis prove that the new SDM downlink mode can greatly improve the downlink channel capacity compared with the TDM downlink mode.
Key words:  unmanned aerial vehicle(UAV) relaying  space division multiplexing(SDM)  time division multiplexing(TDM)  quick adjustment beam pointing by packet  downlink channel capacity
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