@inproceedings{278d6128c4c84e6188c9e01b6eba0907,
title = "Optimal multi-user transmission based on a single intelligent reflecting surface",
abstract = "Intelligent Reflecting Surface (IRS) is envisioned as a revolutionary solution for providing high data rate communication, better signal coverage and physical layer security through controlling the transmission environment of electromagnetic (EM) wave. In this paper, based on a single IRS and millimeter channel model, the optimal multi-user transmission sum rate is derived with the maximal ratio combining (MRC) beamformer. The conditions to achieve such a maximum sum rate are expressed as a function of placement of transceivers, number of IRS elements and its spacing. We first transformed the single IRS assisted non-scattering mmWave channel into a high-rank multiple-in multiple-out (MIMO) channel. The result shows that even without rich scattering, each single antenna user can enjoy the maximal passive beamforming gain while keeping spatial orthogonality to leverage the maximal spatial diversity when the corresponding conditions are satisfied. Simulation results verify the existence and accuracy of optimal placement of multi-user transmission and present that the transmission sum rate of IRS channel scales by the number of IRS elements with different spacing settings.",
keywords = "Beamforming, Intelligent reflecting surface, MIMO, MmWave, Multi-users",
author = "Yihong Liu and Lei Zhang and Klaine, \{Paulo Valente\} and Imran, \{Muhammad Ali\}",
note = "Publisher Copyright: {\textcopyright}2021 IEEE; 4th IEEE International Conference on Electronic Information and Communication Technology, ICEICT 2021 ; Conference date: 18-08-2021 Through 20-08-2021",
year = "2021",
month = aug,
day = "18",
doi = "10.1109/ICEICT53123.2021.9531152",
language = "English",
series = "2021 IEEE 4th International Conference on Electronic Information and Communication Technology, ICEICT 2021",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
pages = "1--4",
booktitle = "2021 IEEE 4th International Conference on Electronic Information and Communication Technology, ICEICT 2021",
address = "United States",
}