[1] AI Junjie, CHEN Weicong, LIU Jia, CAI Xuefeng, et al. Multiuser transmission scheme in millimeter-wave systems assisted by an RIS subarray [J]. Journal of Southeast University (English Edition), 2025, 41 (2): 140-146. [doi:10.3969/j.issn.1003-7985.2025.02.002]
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Multiuser transmission scheme in millimeter-wave systems assisted by an RIS subarray(
)
智能超表面子阵辅助的毫米波多用户传输方案
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 41
- Issue:
- 2025 2
- Page:
- 140-146
- Research Field:
- Information and Communication Engineering
- Publishing date:
- 2025-06-17
Info
- Title:
- Multiuser transmission scheme in millimeter-wave systems assisted by an RIS subarray
- 智能超表面子阵辅助的毫米波多用户传输方案
- Author(s):
- AI Junjie, CHEN Weicong, LIU Jia, CAI Xuefeng, TANG Wankai, JIN Shi
- National Mobile Communications Research Laboratory, Southeast University, Nanjing 211189, China
- Keywords:
- millimeter waves; reconfigurable intelligent surface (RIS); discrete Fourier transform (DFT) codebook; wireless communications
- PACS:
- TN929.5
- DOI:
- 10.3969/j.issn.1003-7985.2025.02.002
- Abstract:
- The deployment of reconfigurable intelligent surfaces (RISs) can enhance the coverage ability of millimeter wave (mmWave) communication systems.However, the typical strong line-of-sight (LoS) far-field propagation between a base station (BS) and an RIS reduces channel rank, thus affecting multiuser spatial multiplexing.To address this issue, we propose an RIS subarray-assisted mmWave multiuser transmission scheme.To increase channel rank, RIS is divided into multiple subarrays with adjustable spacing, and the channel is modeled using a hybrid spherical- and planar-wave model.To minimize interuser interference, the RIS subarrays are deployed in the discrete Fourier transform (DFT) direction of the BS antenna array.To maximize signal efficiency, the BS precoder, the RIS reflection coefficients, and the user’s combiner are jointly designed.Numerical simulations were conducted to verify the effectiveness of the proposed RIS subarray deployment strategy and the performance of the wireless transmission scheme.In a four-user equipment (UE) communication scenario in the mmWave band, the effective rank of the BS-RIS channel approaches full rank, and the spectral efficiency of each UE is improved by at least 3 bit/(s·Hz).
- 部署智能超表面可增强毫米波通信覆盖能力，但基站与超表面间典型的强视距远场传播将降低信道秩，影响多用户空间复用。针对以上挑战，提出了智能超表面子阵辅助的毫米波多用户传输方案。为了提高信道秩，将智能超表面被划分成多个具有可调间距的子阵，并且采用混合球面波和平面波模型进行信道建模。从最小化多用户间干扰的目标出发，将智能超表面子阵部署于基站的DFT方向上。基于最大化有效信号的准则，联合设计了基站的预编码、智能超表面的反射系数以及用户的合并矩阵。数值仿真验证了所提智能超表面子阵部署策略的有效性以及无线传输方案的性能。在毫米波频段四用户的通信场景下，基站与智能超表面间信道的有效秩在接近满秩的同时，各用户的频谱效率均获得至少3 bit/（s·Hz）的提升。
References:
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Memo
- Memo:
-
Received 2024-05-05,Revised 2024-09-09.
Biographies:Ai Junjie (2001—), male, Ph.D.candidate;Jin Shi (corresponding author), male, doctor, professor, jinshi@seu.edu.cn.
Foundation items:The National Natural Science Foundation of China (No.62261160576, 62401137), the China Postdoctoral Science Foundation (No.BX20230065, 2024M750421), the Natural Science Foundation of Jiangsu Province (No.BK20241281), the Jiangsu Excellent Postdoctoral Program (No.2023ZB476), the Fundamental Research Funds for the Central Universities (No.2242023K5003), the Youth Science & Technology Talents Lifting Project by JSAST (No.TJ-2022-083).
Citation:AI Junjie,CHEN Weicong,LIU Jia,et al.Multiuser transmission scheme in millimeter-wave systems assisted by an RIS subarray[J].Journal of Southeast University (English Edition),2025,41(2):140-146.DOI:10.3969/j.issn.1003-7985.2025.02.002.DOI:10.3969/j.issn.1003-7985.2025.02.002