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Lens MIMO based millimeter wave broadcast channel

We consider the beamforming design for the millimeter wave (mmWave) broadcast channel using lens array antenna based multiple-input-multiple-output (MIMO) communication system (also referred to as “lens MIMO” in this work). Recently, lens MIMO based communication was proposed as a promising scheme for the single-user mmWave network to greatly reduce the computational and signal processing complexity of the system. In this paper, we propose a simple beamforming scheme for lens MIMO in broadcast channels which performs as good as the recently proposed hybrid beamforming (HBF), but with much reduced hardware and power consumption cost, thanks to the energy focusing property of lens array.