Nec Corporation

Nariman Torkzaban

Mohammad Ali Khojastepour

Reconfigurable surfaces and methods for configuring surfaces include measuring properties of one or more incident signals at a configurable cell of a surface. A beam forming pattern for the surface is determined based on the measured properties of the one or more incident signals. Parameters of the configurable cell are set to implement the beam forming pattern in the surface.

Reconfigurable intelligent surface beamforming

Beamforming methods and systems include determining a tradeoff curve between scanning beamwidth and transmission beamwidth based on a channel distribution for a base station. A set of scanning beams is selected based on the tradeoff curve. Devices around the base station are scanned for using the set of scanning beams. A set of transmission beams is selected for communications with the devices based on information received during the scanning. The set of transmission beams are used for transmission with a beamforming transmitter.

Optimizing scanning beam penetration

A method for transmitting data is provided. The method includes sending a probing packet using a scanning beam selected from a set of probing beams. The method further includes receiving feedback about the probing packet. The method also includes determining a data transmission beam based on the set of probing beams and the received feedback. The method additionally includes transmitting data using a multi-element antenna that is configured according to the determined data transmission beam.

Multi-user beam alignment in presence of multi-path

A communications system for hybrid beamforming is provided. The communications system includes a base station encoding data into a plurality of streams, each transmitted through a radio frequency chain. The communication system further includes a beamforming codebook including a set of beamforming codewords. The communications system also includes a beamformer transmitting a given one of the plurality of streams through multiple antennas by adjusting a phase and a gain of symbols of the given one of the plurality of streams for each of the multiple antennas by using a corresponding beamforming coefficient of a given beamforming codeword chosen from the beamforming codebook. A beam and its corresponding beamforming codeword is designed such that the mean squared error between the beam pattern generated with the given beamforming codeword and a given beam pattern is minimized.

Codebook design for beamforming in 5G and beyond mmWave systems

A method of communicating between a transmitter and a receiver in a wireless communication system is provided. The method includes selecting a beamformer from a beamforming codebook. The method further includes transmitting a signal from antenna elements using the selected beamformer by adjusting a gain and a phase of the signal. The antenna elements correspond to an absolute value and an angle of a respective complex beamforming coefficient from the selected beamformer. The beamformer is a composite beam including a plurality of disjoint beam lobes, and each of the plurality of disjoint beam lobes covers a desired angular interval.

Codebook design for composite beamforming in next-generation mmWave systems

A method for shaping a mmWave wireless channel in a wireless network is presented. The method includes enabling communication between a multi-antenna transmitter and a multi-antenna receiver, positioning a reconfigurable intelligent surface (RIS) in a vicinity of the multi-antenna transmitter and the multi-antenna receiver, constructing the RIS as 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, 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 MS to generate sharp and effective beams having almost uniform gain in a desired angular coverage interval (ACI).

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College Park, MD, United States of America

Nariman Torkzaban