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Statistical CSI based Design for Intelligent Reflecting Surface Assisted MISO Systems

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Document pages: 11 pages

Abstract: This paper considers an intelligent reflecting surface (IRS) aidedmultiple-input single-output communication system, where statistical channelstate information (CSI) is exploited for transmit beamforming and IRSbeamforming. A tight upper bound is derived for the ergodic capacity of thesystem. Based on which, the joint optimization of transmit beam and IRS beamare studied. Depending on whether a line-of-sight path exists between theaccess point and user, two different cases, namely, Rician fading and Rayleighfading, are separately treated. Specifically, for the Rician fading case, aniterative algorithm is proposed, which is guaranteed to converge. For theRayleigh fading case, closed-form designs are obtained for the transmit beamand IRS beam. Simulation results show the proposed beamforming scheme achievessimilar performance as the benchmark algorithm requiring instantaneous CSI.

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