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Intelligent reflecting surface (IRS) has become a promising technology to aidnext generation wireless communication systems. In this paper, we develop analternating beamforming technique with a novel concept of IRS elementallocation for multiple-input multiple-output systems when a base stationsupports multiple single antenna users aided with a single IRS. Specifically,we allocate each IRS element separately to each user, thus, in the beamformingstage allowing the IRS element only consider a single user at a time. In resultto this separation, the complexity is vastly decreased. The proposedbeamforming technique tries to maximize the minimum rate of all users withminimal complexity. In the numerical results, we show that the proposedtechnique is comparable to the convex optimization-based benchmark withsufficiently less complexity.

Alternating Beamforming with Intelligent Reflecting Surface Element Allocation