Intelligent reflecting surface (IRS) has recently emerged as an appealing technique to control the random and time-varying channels in wireless communications. In this paper, we consider a new multi-IRS aided multiuser system, where a multi-antenna base station (BS) serves multiple distributed users with the aid of two types of IRSs, which are deployed near the BS and distributed users, thus referred to as the BS-side IRSs and user-side IRSs, respectively. Under such hybrid IRS deployment, the IRS-user association is crucial for maximizing the network throughput, where each user can be associated with no IRS, a BS-side IRS only, a user-side IRS only, or both BS- and user-side IRSs. To solve this problem, we jointly optimize the IRSuser associations and IRSs' passive beamforming to maximize the minimum effective channel gain among all users. Simulation results demonstrate the effectiveness of the proposed association design for multi-IRS aided multiuser systems under the hybrid IRS deployment.
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