王靖瑜，鞠宏浩，方旭明
（西南交通大学，中国 成都 611756）
摘要：提出了一种智能反射面（IRS）辅助的高铁通信方案。针对视距（LOS）主导的无线通信场景，在车载接入点（AP）和基站（BS）已知信道状态情况下，本方案首先通过调整IRS反射信号相位，补偿级联信道中LOS分量的多普勒频移，后通过最大化LOS径波束赋形增益，并在接收端处将IRS反射信号与基站发射信号相干叠加，提升接收信号质量。仿真结果表明，相比于未部署IRS场景，IRS辅助的高铁无线通信系统有效减轻了高铁高速移动对无线信道带来的快衰落影响，并且系统误比特率（BER）性能也得到了明显改善。
关键词：高速铁路；智能反射面；快衰落；波束赋形
Applications of Intelligent Reflecting Surface in High-Speed Train Communications
WANG Jingyu, JU Honghao, FANG Xuming
(Southwest Jiaotong University, Chengdu 611756, China)
Abstract: An Intelligent Reflecting Surface (IRS)-assisted high-speed train communications scheme is proposed. For the Line-Of-Sight (LOS) dominant communication scenario, assuming the channel state information is perfectly known by the access point (AP) and base station (BS), the proposed scheme can control the IRS reflecting phase to compensate for the Doppler shift of the LOS component, maximize the beamforming gain of the LOS path, and achieve the coherent combination of the IRS reflected signal and BS transmitted signal. Simulation results show that the IRS-assisted high-speed train communication system can effectively alleviate the fast fading and improve system Bit Error Rate (BER).
Keywords: high-speed train; intelligent reflecting surface; fast fading; beamforming
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