Abstract
This paper investigates a double intelligent reflecting surface (IRS) hybrid network architecture, where the two surfaces are deployed to cooperatively assist communication between a multi-antenna base station and a single-antenna user over multipath channels. We decouple the double-IRS assisted user communication system by utilizing sparse active elements in the second IRS, where active beamforming at the base station and passive beamforming at the first IRS were simultaneously optimized using an alternating optimization method, and the user multipath channels are estimated by the second IRS. We optimize the reflection coefficients of the second IRS and analyze the feasible bit rate that the user can achieve. Simulation results are presented to validate the effectiveness of the proposed architecture and the benefits of the double-IRS in increasing spectral efficiency.
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