In this paper, we combine two-timescale beamforming and multi-IRS aided joint spatial division and multiplexing (JSDM) in a mmWave multiuser system. Specifically, all the users are first divided into different groups and each group is associated with an IRS. Then, we propose a novel two-stage grouping-based randomized beamforming (TS-GRB) scheme, where the analog beamformer is designed based on the statistical CSI (S-CSI) in the first stage, and the short-term digital beamformer at the BS and long-term passive beam pattern control policy at the IRSs are jointly optimized in the second stage with both S-CSI and dimension-reduced effective I-CSI. In particular, in the first stage, the analog beamformer is designed to reduce the inter-group interference (IGI) and effective channel dimension, while in the second stage, a two-timescale randomized joint beamforming (TRJB) algorithm is proposed to maximize the proportional fairness utility (PFU). We show that through two-timescale beamforming, JSDM and proper problem reformulation, the pilot overhead of our TS-GRB scheme is significantly lower than existing schemes. Finally, simulation results are presented to illustrate the effectiveness of the proposed TS-GRB scheme.


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    Title :

    IRS-Aided JSDM for mmWave Multiuser MISO Systems: A Low Overhead Scheme


    Contributors:
    Chen, Zijian (author) / Zhao, Ming-Min (author) / Li, Min (author) / Lei, Ming (author) / Zhao, Min-Jian (author)


    Publication date :

    2023-10-10


    Size :

    1258826 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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