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This letter investigates a downlink multiple input single output (MISO)system based on transmissive reconfigurable metasurface (RMS) transmitter.Specifically, a transmitter design based on a transmissive RMS equipped with afeed antenna is first proposed. Then, in order to maximize the achievablesum-rate of the system, the beamforming design and power allocation are jointlyoptimized. Since the optimization variables are coupled, this formulatedoptimization problem is non-convex, so it is difficult to solve it directly. Tosolve this problem, we propose an alternating optimization (AO) technique basedon difference-of-convex (DC) programming and successive convex approximation(SCA). Simulation results verify that the proposed algorithm can achieveconvergence and improve the achievable sum-rate of the system.

Beamforming Design and Power Allocation for Transmissive RMS-based Transmitter Architectures