Reconfigurable intelligent surface‐aided millimetre wave communications utilizing two‐phase minimax optimal stochastic strategy bandit

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  • Ehab Mahmoud Mohamed
    Electrical Engineering Department, College of Engineering Prince Sattam Bin Abdulaziz University Wadi Addwasir Saudia Arabia
  • Sherief Hashima
    Computational Learning Theory team RIKEN‐Advanced Intelligence project Fukuoka Japan
  • Nasreen Anjum
    Cyber & Technical Computing School of Computing and Engineering University of Gloucestershire, Cheltenham Gloucestershire UK
  • Kohei Hatano
    Computational Learning Theory team RIKEN‐Advanced Intelligence project Fukuoka Japan
  • Walid El Shafai
    Security Engineering Lab, Computer Science Department Prince Sultan University Riyadh Saudi Arabia
  • Basem M. Elhalawany
    School of Computer Science Shenzhen University Shenzhen China

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<jats:title>Abstract</jats:title><jats:p>Millimetre wave (mmWave) 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 mmWave 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 mmWave 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 mmWave 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.</jats:p>

収録刊行物

  • IET Communications

    IET Communications 16 (18), 2200-2207, 2022-08-11

    Institution of Engineering and Technology (IET)

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