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10 条记录 (耗时 0.017 秒)

    Method to estimate SNR for MU-MIMO based on channel orthogonality
    3.
    发明授权
    Method to estimate SNR for MU-MIMO based on channel orthogonality 有权

    公开(公告)号：US11411632B2

    公开(公告)日：2022-08-09

    申请号：US16976207

    申请日：2019-02-28

    申请人： Telefonaktiebolaget LM Ericsson (publ)

    发明人： Jianguo Long ,  Mats Åhlander ,  Chandra Sekhar Bontu ,  Yongquan Qiang ,  Hong Ren

    IPC分类号： H04B7/06 ,  H04B17/336 ,  H04B7/0452

    摘要： Systems and methods for estimating Signal-to-Noise Ratio (SNR) for Multi-User Multiple-Input and Multiple-Output (MU-MIMO) based on channel orthogonality. In some embodiments, a method performed by a radio access node includes obtaining a SU-MIMO signal quality measurement for at least a first user and an additional user; obtaining an indication of orthogonality between a channel of the first user and a channel of the additional user; and estimating a MU-MIMO signal quality measurement for the first user as if the first user and the additional user are paired with each other for a potential MU-MIMO transmission based on the SU-MIMO signal quality measurements and the indication of orthogonality. In this way, a computational complexity for the SINR estimation of MU-MIMO users can be greatly reduced. This may enable a large number of user pairing alternatives to be evaluated in practical wireless systems to achieve improved MU-MIMO performance.

    Method and network node for enabling reduced interference in a wireless network
    5.
    发明授权
    Method and network node for enabling reduced interference in a wireless network 有权

    公开(公告)号：US11012173B2

    公开(公告)日：2021-05-18

    申请号：US16333473

    申请日：2017-06-22

    申请人： Telefonaktiebolaget LM Ericsson (publ)

    发明人： Mats Åhlander ,  Patrik Rask ,  David Sandberg

    IPC分类号： H04W4/00 ,  H04J11/00 ,  H04L5/00 ,  H04L27/26 ,  H04W72/12 ,  H04W56/00

    摘要： A method and a first network node (800) serving a first cell (800A) in a wireless network, for enabling reduction of interference in a second cell (800B) caused by transmission of reference signals in the first cell (800A). The first network node (800) transmits (8:1) scheduling blocks with said reference signals, using a time offset relative transmission of scheduling blocks in the second cell. A timing advance value is determined (8:3) for a wireless device (802) and the wireless device (802) instructed (8:4) to apply said timing advance value for uplink transmissions. The timing advance value was determined such that uplink symbols transmitted from the wireless device (802) are aligned with uplink symbols received at a second network node (804) of the second cell (804A).

    Beamforming in cellular systems using the same feedback information for different physical channels
    6.
    发明授权
    Beamforming in cellular systems using the same feedback information for different physical channels 有权

    公开(公告)号：US10979119B2

    公开(公告)日：2021-04-13

    申请号：US16970979

    申请日：2018-04-18

    申请人： Telefonaktiebolaget LM Ericsson (publ)

    发明人： Chandra Sekhar Bontu ,  Mats Åhlander ,  Magnus Hurd ,  Anders Johansson ,  Hong Ren

    IPC分类号： H04B7/06 ,  H04L25/02 ,  H04B7/0456

    摘要： Embodiments of a method in a base station for precoding a downlink transmission are disclosed. In some embodiments, the method comprises obtaining, for a time instant k, an estimate of a channel matrix for a wireless channel for a downlink from the base station to a wireless device and projecting the estimate of the channel matrix onto one or more sets of spatial orthonormal functions, thereby obtaining respective sets of coefficients. The method further comprises, for each set of spatial orthonormal functions, filtering the set of coefficients for the time instant k based on a filtering parameter that is specific to a downlink channel to be transmitted. The method further comprises generating beamforming weights using the filtered set of coefficients for at least one of the sets of spatial orthonormal functions, and precoding the downlink channel using the beamforming weights.

    Method and network node for reducing interference in a wireless network
    8.
    发明授权
    Method and network node for reducing interference in a wireless network 有权

    公开(公告)号：US11283536B2

    公开(公告)日：2022-03-22

    申请号：US15761297

    申请日：2016-09-15

    申请人： TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

    发明人： David Sandberg ,  Mats Åhlander ,  Ari Kangas

    IPC分类号： H04J11/00 ,  H04L27/26 ,  H04L5/00 ,  H04W72/12 ,  H04W56/00

    摘要： A method and a network node (700) serving a first cell in a wireless network, for reducing interference in a second cell caused by transmission of reference signals in the first cell. The network node (700) transmits (7:2) in the first cell a scheduling block where a number of said reference signals are located in predefined resource element positions in the scheduling block, using a time offset relative transmission of a scheduling block in the second cell. Thereby, the impact of interference from a reference signal from one network node will be distributed over several resource elements in the other network node so that the impact in each resource element is reduced, as compared to when all interference from the reference signal hits one single resource element when no time offset is used.