Method and system for performing multiple-user multiple-input multiple-output communication, and non-transitory computer readable storage medium

A method for performing multiple user multiple input multiple output (MU-MIMO) communication, the method comprises:

• computing a digital beamformer matrix with a digital precoder for processing baseband signals to be transmitted;
• processing the baseband signals with a plurality of radiofrequency (RF) chains;
• computing an analog beamformer matrix with an analog precoder for processing analog or passband signals,
• wherein the analog precoder comprises:
• a plurality of adders that are connected to a plurality of antennas, wherein each antenna of the plurality of antennas is connected to an adder of the plurality of adders;
• a plurality of three-way switches is connected to a plurality of RF chains and each three-way switch of the plurality of three-way switches is connected to the plurality of adders, a first terminal of the plurality of three-way switches is directly connected to a respective RF chain among the plurality of RF chains, a second terminal of the plurality of three-way switches is connected to an inverter for inverting a phase of the analog or passband signal, and a third terminal of the plurality of three-way switches turns off the analog or passband signal, and the plurality of three-way switches is set based on the computed analog beamforming matrix;
• and
• computing an optimization function to obtain a maximization of a system sum-rate based on the digital beamformer matrix and the analog beamforming matrix, wherein the analog precoder sets a position of the plurality of three-way switches based on the maximized sum-rate.