Multi-IRS-Aided Millimeter-Wave Multi-User MISO Systems for Power Minimization Using Generalized Benders Decomposition

Difficulties in controlling IRSs to form the optimized passive beamforming have rarely been considered in intelligent reflecting surface (IRS)-aided systems, which are summarized as follows: 1) sending the optimized passive precoding vectors to the IRS controller incurs significant control overheads...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2023-11, Vol.22 (11), p.1-1
Main Authors: Huang, Huan, Zhang, Ying, Zhang, Hongliang, Zhao, Zixin, Zhang, Chongfu, Han, Zhu
Format: Article
Language:English
Subjects:
Algorithms
Array signal processing
beam training
Beamforming
Benders decomposition
Circuits
Complexity theory
millimeter wave
Millimeter wave communication
Millimeter waves
MISO (control systems)
MISO communication
Mixed integer
multi-user MISO
Nonlinear optics
Nonlinear programming
optical true time delay
Optimization
Precoding
Reconfigurable intelligent surface
Scalars
Wireless communication
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Summary:Difficulties in controlling IRSs to form the optimized passive beamforming have rarely been considered in intelligent reflecting surface (IRS)-aided systems, which are summarized as follows: 1) sending the optimized passive precoding vectors to the IRS controller incurs significant control overheads; 2) implementing the optimized passive precoding needs to set massive modes in the IRS control circuit. To address these issues, we investigate codebook-based passive beamforming for multi-IRS-aided millimeter-wave (mmWave) multi-user multiple-input single-output (MU-MISO) systems, where the control overheads are reduced to several scalars and the number of modes set in the IRS control circuit is reduced to that of codewords. Moreover, we formulate a joint passive and active precoding problem in the multi-IRS-aided mmWave MU-MISO system as a mixed-integer nonlinear programming (MINLP) problem, and then develop a generalized Benders decomposition (GBD)-based joint passive and active precoding algorithm. The proposed algorithm offers near-optimal performance (≥ 99.9%) with significantly-reduced computational complexity. Simulation results show that the proposed algorithm achieves energy savings of up to 50% and 95%, compared to the benchmark by the maximum ratio transmission and that without IRSs, respectively. In addition, the energy savings increase with the number of reflecting elements packed on each IRS as well as that of codewords.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2023.3257053