基于波束选择的高铁MIMO波束赋形研究  

Research on High-speed Railway MIMO Beamforming based on Beam Selection

作　　者：薛凯 陈凯亚[1] 廖成[1] XUE Kai;CHEN Kai-ya;LIAO Cheng(Institute of Electromagnetics,Southwest Jiaotong University,Chengdu Sichuan 610031,China)

机构地区：[1]西南交通大学电磁所,四川成都610031

出　　处：《通信技术》2020年第6期1331-1335,共5页Communications Technology

摘　　要：高速铁路通信系统的容量不仅受限于频谱,而且高移动性也对其有很大影响。对于高铁移动通信存在的能效低、容量小问题,设计了一种基于自适应波束选择的高铁MIMO波束赋形迭代算法。在能够预测列车位置信息的前提下,建立高铁MIMO信道模型,计算不同位置各个波束的信噪比和系统容量。在此基础上,系统能够自适应调节激活的波束来保证最大系统容量。仿真结果表明:列车在距离基站较近时,多流波束赋形的优势明显;远离基站时,自适应的波束选择也能保持最大的系统容量。The capacity of high-speed railway communication systems is not only limited by the frequency spectrum,but also influenced by the high mobility.For the problems of low energy efficiency and small capacity in high-speed rail mobile communications,an iterative algorithm based on adaptive beam selection is designed for high-speed rail MIMO beamforming.On the premise of being able to predict the train position information,the MIMO channel model of high speed railway is established to calculate the signalto-noise ratio and system capacity of each beam at different positions.Based on this scheme,the system can adaptively adjust the activated beam to ensure the maximum system capacity.Simulation results indicate that when the train is close to the base station,the advantages of multi-stream beamforming are obvious;When is far away from the base station,the adaptive beam selection can also maintain the maximum system capacity.

关 键 词：波束赋形 高速铁路 迭代算法 系统容量 

分 类 号：TN929.5[电子电信—通信与信息系统]