摘要：提出了一種智能反射面（IRS）輔助的高鐵通信方案。針對視距（LOS）主導的無線通信場景，在車載接入點（AP）和基站（BS）已知信道狀態情況下，本方案先通過調整IRS反射信號相位，補償聯信道中LOS分量的多普勒頻移，后通過化LOS徑波束賦形增益，并在接收端處將IRS反射信號與基站發射信號相干疊加，提升接收信號質量。仿真結果表明，相比于未部署IRS場景，IRS輔助的高鐵無線通信系統有效減輕了高鐵高速移動對無線信道帶來的快衰落影響，并且系統誤比特率（BER）性能也得到了明顯改善。 關鍵詞：高速鐵路；智能反射面；快衰落；波束賦形
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
原創作者：北京偉祥科技有限公司
