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Two-Timescale Optimization for Intelligent Reflecting Surface Aided D2D Underlay Communication

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Document pages: 6 pages

Abstract: The performance of a device-to-device (D2D) underlay communication system islimited by the co-channel interference between cellular users (CUs) and D2Ddevices. To address this challenge, an intelligent reflecting surface (IRS)aided D2D underlay system is studied in this paper. A two-timescaleoptimization scheme is proposed to reduce the required channel training andfeedback overhead, where transmit beamforming at the base station (BS) andpower control at the D2D transmitter are adapted to instantaneous effectivechannel state information (CSI); and the IRS phase shifts are adapted toslow-varying channel mean. Based on the two-timescale optimization scheme, weaim to maximize the D2D ergodic rate subject to a given outage probabilityconstrained signal-to-interference-plus-noise ratio (SINR) target for the CU.The two-timescale problem is decoupled into two sub-problems, and the twosub-problems are solved iteratively with closed-form expressions. Numericalresults verify that the two-timescale based optimization performs better thanseveral baselines, and also demonstrate a favorable trade-off between systemperformance and CSI overhead.

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