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公开(公告)号：WO2022222074A1
公开(公告)日：2022-10-27
申请号：PCT/CN2021/088776
申请日：2021-04-21
发明人： SONG, Nuan , AHMED SALEM, Rana , YANG, Tao , ZHAO, Yan , LIU, Hao
IPC分类号： H04B7/0413
摘要： Embodiments of the present disclosure relate to a beamforming solution for FDD MIMO communication. A first device receives a reference signal from a second device in a first channel, and determines a covariance matrix associated with the first channel. The first device determines a set of beamforming vectors from the covariance matrix based on the number of dominant angles of arrival associated with the reference signal and the number of beams associated with the set of beamforming vectors, and performs a transmission to the second device based on the set of beamforming vectors in a second channel. In this way, beamforming vectors can be calculated from the transformed channel covariance matrix with the angular spread and imperfect reciprocity considered.
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公开(公告)号：WO2023070286A1
公开(公告)日：2023-05-04
申请号：PCT/CN2021/126206
申请日：2021-10-25
发明人： SONG, Nuan , WESEMANN, Stefan , PIIRAINEN, Olli Juhani , SALEM, Rana Ahmed , YANG, Tao , ZHAO, Yan
IPC分类号： H04B17/00
摘要： Embodiments of the present disclosure relate to a beamforming solution for MIMO communication. The method implemented at a first device comprises: obtaining: a signature vector corresponding to a beam which is in a first direction from the first device to a second device, and a first channel covariance matrix associated with a transmission from the first device to the second device. The method further comprises generating, based on the signature vector and the first channel covariance matrix, a beamforming matrix to be used for the transmission from the first device to the second device. In this way, the accuracy of the beamforming matrix is improved and the calculation amount for the beamforming matrix is reduced.
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公开(公告)号：WO2022188101A1
公开(公告)日：2022-09-15
申请号：PCT/CN2021/080245
申请日：2021-03-11
发明人： LIU, Hao , LI, Baocai , SHI, Dan , YANG, Tao , SONG, Nuan , ZHAO, Yan
IPC分类号： H04L25/00
摘要： Embodiments of the present disclosure relate to methods, apparatuses and computer readable storage media for SRS data transmission. In example embodiments, a method is provided. According to the method, an apparatus forwards, during a first period, first SRS data received from a terminal device to a further apparatus. The further apparatus determines, based on the first SRS data, compression information for compressing SRS data, and transmits the compression information to the apparatus. Thereby, the apparatus compresses, during a second period, second SRS data received from the terminal device based on the compression information, and transmits, during the second period, the compressed second SRS data to the further apparatus. In this way, the SRS data can be effectively compressed, thus reducing the latency of the SRS data transmission.
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公开(公告)号：WO2020082244A1
公开(公告)日：2020-04-30
申请号：PCT/CN2018/111479
申请日：2018-10-23
IPC分类号： H04B7/04
摘要： Embodiments of the present disclosure provide an apparatus and method for beam based pre-processing in a transmitting device in a multi-user multiple-input multiple-output (MU-MIMO) system. The transmitting device further comprises a transmission and receiver unit (TRX) array and a digital precoding module. The apparatus is configured to map a plurality of TRXs of the TRX array to a plurality of transmit ports of the digital precoding module according to a precoding matrix, wherein the number of transmit ports is less than the number of the plurality of TRXs. The precoding matrix is determined by steps of determining a channel covariance matrix for a plurality of receiving devices based on the channel information between the plurality of receiving devices and the transmitting device, performing an eigen decomposition operation for the channel covariance matrix to derive an eigenvector matrix, and selecting multiple eigenvectors from the eigenvector matrix as column vectors of the precoding matrix.
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