Capacity Enhancement Using Cooperative Distributed Antenna System in Downlink High-Speed Train Environments

Yue Xin, Zhonghua Liang, Yimeng Bai, Chenhui Zhai, Wei Li
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引用次数: 1

Abstract

In order to improve the system capacity of distributed antenna system (DAS) in downlink high-speed train (HST) environments, this paper presents a power allocation scheme for remote antenna units (RAUs) based on the cooperative distributed antenna system (CDAS). The investigated power allocation scheme exploits the channel state information (CSI) between RAUs and vehicle-mounted relay (VMR). Based on the CDAS-CSI power allocation, a corresponding RAU selection algorithm is introduced to quickly find the suboptimal solution that maximizes the channel capacity and to optimize the number of RAUs in CDAS. Simulation results show that the CDAS-CSI power allocation greatly improves the downlink system capacity compared to the cases of non-cooperation among RAUs and equal power allocation among RAUs.
高速列车下行环境下协同分布式天线系统的容量增强
为了提高分布式天线系统(DAS)在高速列车下行环境下的系统容量,提出了一种基于协同分布式天线系统(CDAS)的远程天线单元(rau)功率分配方案。所研究的功率分配方案利用了rau和车载继电器之间的信道状态信息(CSI)。在CDAS- csi功率分配的基础上,引入相应的RAU选择算法,快速找到最大信道容量的次优解,优化CDAS中RAU的数量。仿真结果表明,相对于用户间不合作和用户间功率分配均等的情况,CDAS-CSI功率分配方式大大提高了下行系统的容量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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