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Joint Design of Transmit Beamforming IRS Platform and Power Splitting SWIPT Receivers for Downlink Cellular Multiuser MISO

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Document pages: 22 pages

Abstract: A multiple antenna base station (BS) with an intelligent reflecting surface(IRS) platform, and several single antenna users are considered in the downlinkmode. Simultaneous wireless information and power transfer (SWIPT) is utilizedby the BS via transmit beamforming to convey information and power to alldevices. Each device applies power splitting (PS) to dedicate separate parts ofreceived power to information decoding and energy harvesting. We formulate atotal transmit power minimization problem to jointly design the BS beamformingvectors, IRS phase shifts, and PS ratios at the receivers subject to minimumrate and harvested energy quality of service (QoS) constraints at all thereceivers. First, we develop a block coordinate descent algorithm, also knownas alternating optimization that can decrease the objective function with everyiteration with guaranteed convergence. Afterwards, two low-complexitysub-optimal algorithms that rely on well-known maximum ratio transmission andzero-forcing beamforming techniques are introduced. These algorithms arebeneficial when the number of BS antennas and or number of users are large, orcoherence times of channels are small. Simulations corroborate the expectationthat by deploying a passive IRS, BS power can be reduced by $10-20$ dBw whilemaintaining similar guaranteed QoS. Furthermore, even the proposed sub-optimalalgorithms outperform the globally optimal SWIPT solution without IRS for amodest number of IRS elements.

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