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<p>In this paper, multiple active Intelligent Reflecting Surfaces (IRS) are used to enhance the communication between a Base Station with multiple antennas and multiple users in a region. The average Signal-to-Noise Ratio (SNR) maximization is employed to design the gain matrices of IRSs. To avoid the solution of infinite SNR by infinite gains, a constraint on the amplitude of the gain matrices is considered. The derived optimization problem is solved using an alternating maximization algorithm to find the suboptimal solution in which the sub-problems have a closed-form solution, which shows itself in the computational efficiency of the overall algorithm. The simulation results show the SNR improvement of the proposed method with multiple IRS in the random phase case of gain matrices of the IRSs and in the case of using only one IRS. Moreover, to show the practical limitations of the proposed method, simulation results for scenarios involving fading channels and inter-IRS interference are presented. The results reveal performance degradations, emphasizing the need to consider these limitations in future research.</p>

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Average SNR maximization of users aided by multiple active intelligent reflecting surfaces

  • 期刊论文

  • 发表日期：

    2025年5月31日

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  • Zahra Khoshkalam,
  • Hadi Zayyani,
  • Alireza Hariri,
  • Hasan Abu Hilal,
  • Mohammad Salman

摘要

In this paper, multiple active Intelligent Reflecting Surfaces (IRS) are used to enhance the communication between a Base Station with multiple antennas and multiple users in a region. The average Signal-to-Noise Ratio (SNR) maximization is employed to design the gain matrices of IRSs. To avoid the solution of infinite SNR by infinite gains, a constraint on the amplitude of the gain matrices is considered. The derived optimization problem is solved using an alternating maximization algorithm to find the suboptimal solution in which the sub-problems have a closed-form solution, which shows itself in the computational efficiency of the overall algorithm. The simulation results show the SNR improvement of the proposed method with multiple IRS in the random phase case of gain matrices of the IRSs and in the case of using only one IRS. Moreover, to show the practical limitations of the proposed method, simulation results for scenarios involving fading channels and inter-IRS interference are presented. The results reveal performance degradations, emphasizing the need to consider these limitations in future research.