郭雅婧
1，章嘉懿
1，鲁照华
2，王明慧
3
（1. 北京交通大学，中国 北京 100044；2. 中兴通讯股份有限公司，中国 深圳 518057；3. 中国电子学会，中国 北京 100036
）
摘要：虽然智能反射表面（IRS）单元可以通过改变相移和反射系数来增强系统性能，但是用户运动和时延等未知因素使反射波束无法准确覆盖用户。为此，提出一种面向移动用户的波束追踪与覆盖增强算法。首先，根据用户的初始位置、运动方向和速度等信息，估算IRS的目标覆盖区域；然后，对IRS单元进行分组，并设计不同分组单元的反射相移使反射波束指向目标区域的相邻位置，进而实现对用户可能位置的有效覆盖；最后，采用注水算法分配由基站（gNB）发射在IRS不同分组单元上的波束功率，实现对目标区域覆盖的增强。
关键词：毫米波；IRS；相位设计；增强覆盖
Beam Tracking and Coverage Enhancement Algorithm for Mobile Users with Intelligent Reflecting Surface
GUO Yajing1, ZHANG Jiayi1, LU Zhaohua2, WANG Minghui3
（1. Beijing Jiaotong University, Beijing 100044, China; 2. ZTE Corporation, Shenzhen 518057, China; 3. Chinese Institute of Electronics, Beijing 100036, China
）
Abstract: Although intelligent reflecting surface (IRS) unit can enhance system performance by changing phase shift and reflection coefficient, unknown factors such as user motion and time delay make the reflected beam still unable to accurately cover the user. To this end, the target coverage area of the IRS based on the user's historical position and speed information is first estimated. Then the IRS units are grouped and the reflection phase shifts of different grouping units are designed, making the reflected beam point to the adjacent position of the target area to achieve complete coverage of the target area. Finally, the water-filling algorithm is used to allocate the power of the gNB beams, which are transmitted on different IRS grouping units, to enhance the coverage of the target area.
Keywords: millimeter-wave; intelligent reflecting surface; phase shift design; coverage enhancement
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