Reconfigurable Intelligent Surface-Aided Millimetre Wave Communications Utilizing Two-Phase Minimax Optimal Stochastic Strategy Bandit

Mohamed, Ehab Mahmoud ORCID: 0000-0001-5443-9711, Hashima, Sherief, Anjum, Nasreen ORCID: 0000-0002-7126-2177, Hatano, Kohei, Shafai, Walid El and Elhlawany, Basem M. (2022) Reconfigurable Intelligent Surface-Aided Millimetre Wave Communications Utilizing Two-Phase Minimax Optimal Stochastic Strategy Bandit. IET Communications, 16 (18). pp. 2200-2207. doi:10.1049/cmu2.12474

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11525 Mohamed, Hashima, Anjum, Hatano, El Shafai and Elhlawany (2022) Reconfigurable_intelligent_surface_aided_millimetre_wave_communications_utilizing_two_phase_minimax_optimal_stochastic_strategy_bandit.pdf - Accepted Version
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Millimetre wave (mm Wave) communications, that is, 30 to 300 GHz, have intermittent short-range transmissions, so the use of reconfigurable intelligent surface (RIS) seems to be a promising solution to extend its coverage. However, optimizing phase shifts (PSs) of both mm Wave base station (BS) and RIS to maximize the received spectral efficiency at the intended receiver seems challenging due to massive antenna elements usage. In this paper, an online learning approach is proposed to address this problem, where it is considered a two-phase multi-armed bandit (MAB) game. In the first phase, the PS vector of the mm Wave BS is adjusted, and based on it, the PS vector of the RIS is calibrated in the second phase and vice versa over the time horizon. The minimax optimal stochastic strategy(MOSS) MAB algorithm is utilized to implement the proposed two-phase MAB approach efficiently. Furthermore, to relax the problem of estimating the channel state information(CSI) of both mm Wave BS and RIS, codebook-based PSs are considered. Finally, numerical analysis confirms the superior performance of the proposed scheme against the optimal performance under different scenarios.

Item Type: Article
Article Type: Article
Uncontrolled Keywords: Intelligent Surfaces; Wave Communication; Two-Phase Minimax Optimal Stochastic Strategy Bandit
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Divisions: Schools and Research Institutes > School of Business, Computing and Social Sciences
Research Priority Areas: Applied Business & Technology
Depositing User: Kate Greenaway
Date Deposited: 14 Sep 2022 12:16
Last Modified: 31 Oct 2023 11:30

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