A hybrid beamforming method for wireless multi-antenna and frequency-division duplex systems

Patent metadata

Field	Value
Publication number	US-2019115963-A1
Application number	US-201716091984-A
Country	US
Kind code	A1
Filing date	Apr 10, 2017
Priority date	Apr 11, 2016
Publication date	Apr 18, 2019
Grant date	—

Abstract

This invention presents a method and systems for beamforming in wireless communication comprising a base station with a plural of antennas and radio frequency transmitting and receiving chains, a plural of base band transmitting paths and base band receiving paths, and a processor that constructs a subspace for each user equipment using the principal angle information contained in partial channel state information obtained on channels associated with a part of the BS antennas, derives an analog beamforming matrix and/or an analog combining matrix from the subspaces of all the user equipment selected for communication with the base station to achieve analog beamforming, and further performs beamforming at the base band.

First claim

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3 . A base station (BS) for wireless communication comprising a plural of antennas and radio frequency (RF) transmitting and receiving chains: a plural of base band transmitting paths with a digital to analog converter (DAC) and base band receiving paths with an analog to digital converter (ADC) whereas the number of base band transmitting and receiving paths is less than the number of antennas: and a processor that constructs a subspace for each user equipment (UE) using the principal angle information contained in partial channel state information (CSI) obtained on channels associated with a part of the BS antennas, derives an analog beamforming matrix and/or an analog combining matrix from the subspaces of all the UEs selected for communication with the BS to achieve analog beamforming, and additionally performs a beamforming at the base band, wherein the BS transmits CSI measurement pilots in downlink for each UE to estimate the partial CSI and receives the partial CSI fed back by a UE, and the processor applies a predefined analog beamforming matrix to map the pilot signals to a part of antennas for transmitting CSI measurement pilot in the downlink, wherein the predefined analog beamforming matrix is determined by the number of RF chains, the arrangement of the antenna array and the number of antennas at the BS.

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5 . A base station (BS) for wireless communication comprising a plural of antennas and radio frequency (RF) transmitting and receiving chains: a plural of base band transmitting paths with a digital to analog converter (DAC) and base band receiving paths with an analog to digital converter (ADC) whereas the number of base band transmitting and receiving paths is less than the number of antennas: and a processor that constructs a subspace for each user equipment (UE) using the principal angle information contained in partial channel state information (CSI) obtained on channels associated with a part of the BS antennas, derives an analog beamforming matrix and/or an analog combining matrix from the subspaces of all the UEs selected for communication with the BS to achieve analog beamforming, and additionally performs a beamforming at the base band, wherein the BS transmits CSI measurement pilots in downlink for each UE to estimate the partial CSI and receives the partial CSI fed back by a UE, and the processor modifies the angles fed back from the UE according to the ratio of carrier frequency in the uplink and downlink and constructs a subspace to represent the uplink CSI of a UE based on the modified angles and associated gains.

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7 . A base station (BS) for wireless communication comprising a plural of antennas and radio frequency (RF) transmitting and receiving chains: a plural of base band transmitting paths with a digital to analog converter (DAC) and base band receiving paths with an analog to digital converter (ADC) whereas the number of base band transmitting and receiving paths is less than the number of antennas: and a processor that constructs a subspace for each user equipment (UE) using the principal angle information contained in partial channel state information (CSI) obtained on channels associated with a part of the BS antennas, derives an analog beamforming matrix and/or an analog combining matrix from the subspaces of all the UEs selected for communication with the BS to achieve analog beamforming, and additionally performs a beamforming at the base band, wherein the processor estimates the partial CSI using uplink pilots sent from a UE and applies a predefined analog combining matrix to map the received pilot signals at all antenna to RF chains, wherein the predefined analog combining matrix is determined by the number of RF chains, the arrangement of the antenna array and the number of antennas at the BS.

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Assignees

• Liang Ping
• Rf Dsp Inc

Inventors

• Zhu Dengkui
• Li Boyu
• Liang Ping

Classifications

• H04W88/10

  adapted for operation in multiple networks, e.g. multi-mode access points · CPC title

• H04B7/0626

  Channel coefficients, e.g. channel state information [CSI] · CPC title

• H04B7/0617 Primary

  for beam forming · CPC title

• H04W88/02

  Terminal devices · CPC title

• H04W16/28

  using beam steering · CPC title