摘要
为提高高铁应用场景下的无线通信速率,通信系统需向铁路5G专用移动通信系统(5G-R)演进,但5G-R系统的同频组网会带来频繁的小区切换和同频干扰问题,采用单频网(SFN)小区合并的组网方式是解决该问题的方法之一。为了进一步提升SFN系统的性能表现,在基站端和列车端进行天线分布式部署,构成分布式多输入多输出(MIMO)系统。为分析分布式天线部署对于SFN小区合并性能的影响,首先建立MIMO系统结构和传输模型;其次,建立可以描述列车高速移动时大尺度衰落和小尺度衰落的信道模型;最后,仿真分析系统容量和功率分配对分布式MIMO系统容量的影响。仿真结果表明,分布式MIMO系统比SFN系统在系统容量和小区覆盖方面具有更好的表现,且对信道环境的变化有更好的稳定性,并可以通过优化功率分配的方式进一步提高系统容量。
In order to improve the wireless communication rate in the high-speed railway application scene,the communication system needs to evolue to 5G-R.However,the same frequency networking of 5G-R results in frequent cell handover and same frequency interference.The single frequency network(SFN)cell merger is a possible approach for resolving this issue.In order to further improve the performance of the SFN system,antennas are deployed in a distributed manner at both the base station and train ends to form a distributed multiple-input multiple-output(MIMO)system.To examine how distributed antenna deployment affects the performance of SFN,firstly,the MIMO system structure and transmission model is established;secondly,a channel model that describe large-scale fading and small-scale fading during the high-speed movement is established;finally,the influence of system capacity and power allocation on distributed MIMO(D-MIMO)system capacity is simulated and examined.Results from the simulation demonstrate that D-MIMO performs better than SFN in terms of system capacity,stability(in respect of changes to the channel environment)and cell coverage,and has the potential to increase system capacity through power allocation optimization.
作者
蔡垚森
王海龙
王东明
宋铁成
陈建平
CAI Yaosen;WANG Hailong;WANG Dongming;SONG Tiecheng;CHEN Jianping
出处
《铁道通信信号》
2024年第5期43-51,共9页
Railway Signalling & Communication
基金
中国国家铁路集团有限公司科技研究开发计划系统性重大课题(P2020G004)。
作者简介
蔡垚森,东南大学移动通信国家重点实验室,东南大学-泰通科技铁路5G移动通信联合研发中心硕士研究生;王海龙,南京泰通科技股份有限公司工程师;王东明,东南大学移动通信国家重点实验室,东南大学-泰通科技铁路5G移动通信联合研发中心教授;宋铁成,东南大学移动通信国家重点实验室,东南大学-泰通科技铁路5G移动通信联合研发中心教授;陈建平,南京泰通科技股份有限公司正高级工程师。
