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MIMO Precoding Design with QoS and Per-Antenna Power Constraints

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arxiv 2306.02343 v1 pith:HG2ITSFZ submitted 2023-06-04 eess.SP

classification eess.SP
keywords constraintsproblemprecodingdesigndownlinkmu-mimopapcsper-antenna
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Precoding design for the downlink of multiuser multiple-input multiple-output (MU-MIMO) systems is a fundamental problem. In this paper, we aim to maximize the weighted sum rate (WSR) while considering both quality-of-service (QoS) constraints of each user and per-antenna power constraints (PAPCs) in the downlink MU-MIMO system. To solve the problem, we reformulate the original problem to an equivalent problem by using the well-known weighted minimal mean square error (WMMSE) framework, which can be tackled by iteratively solving three subproblems. Since the precoding matrices are coupled among the QoS constraints and PAPCs, we adopt alternating direction method of multipliers (ADMM) to obtain a distributed solution. Simulation results validate the effectiveness of the proposed algorithm.

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