Shaping mmWave wireless channel via multi-beam design using reconfigurable intelligent surfaces

A non-transitory computer-readable storage medium comprising a computer-readable program for shaping a millimeter wave (mmWave) wireless channel in a wireless network, wherein the computer-readable program when executed on a computer causes the computer to perform the steps of:

• receiving signals at a reconfigurable intelligent surface (RIS) in a vicinity of a multi-antenna transmitter and a multi-antenna receiver to communicate between the multi-antenna transmitter and the multi-antenna receiver through the reconfigurable intelligent surface (RIS), the RIS being a uniform planar array (UPA) structure forming a multi-beamforming framework, a surface of the UPA defining an array of discrete elements arranged in a grid pattern, wherein parameters of the discrete elements of the UPA are controllable to achieve multiple disjoint beams covering different solid angles, the RIS reflecting the signals received from the multi-antenna transmitter toward the multi-antenna receiver;
• and
• enabling the plurality of users of the plurality of mobile devices positioned in blind spots of a coverage map to communicate with the multi-antenna transmitter by employing the RIS to generate sharp and effective beams having almost uniform gain in a desired angular coverage interval (ACI).