公开(公告)号：US20210194736A1

公开(公告)日：2021-06-24

申请号：US17048327

申请日：2018-04-16

Applicant: Nokia Solutions and Networks Oy

Inventor： Stefan Wesemann

IPC: H04L25/02 ,  H04B7/06 ,  H04L5/00

Abstract: A method and device, the method comprising receiving (S1) sounding reference signal (SRS) information or demodulation reference signal (DMRS) information, determining (S2) a channel estimate of a channel for a set of users depending on the information, determining (S3) an active user subset ({1, . . . , K}) of the set of users depending on the information, determining (S4) weights (W(i)) for long term beamforming depending on the channel estimate and on the active user subset ({1, . . . , K}).

公开(公告)号：US12057906B2

公开(公告)日：2024-08-06

申请号：US17786083

申请日：2020-01-14

Applicant: NOKIA SOLUTIONS AND NETWORKS OY

Inventor： Lijun Wang ,  Weiqiang Mao ,  Zhijun Liao ,  Youbao Luo ,  Stefan Wesemann

IPC: H04L1/02 ,  H04B7/0452 ,  H04B7/06

CPC classification number: H04B7/0617 ,  H04B7/0452 ,  H04B7/0639

Abstract: According to embodiments of the present disclosure, downlink beamforming in MU-MIMO systems is proposed. Embodiments of the present disclosure take practical receivers into consideration, to further mitigate the interferences sensed by terminal devices. The beamforming scheme according to embodiments of the present disclosure has many advantages. For example, embodiments of the present disclosure tackle interferences from terminal device view, to mitigate the interferences which really affect the received signals of terminal devices. Embodiments of the present disclosure do not assume that terminal devices utilize Eigen receivers but consider more practical receivers used by the terminal devices to mitigate the interferences. Embodiments of the present disclosure have high flexibility, different interference cancelling methods can be used to replace the ZF method.

公开(公告)号：US11546202B2

公开(公告)日：2023-01-03

申请号：US17183772

申请日：2021-02-24

Applicant: NOKIA SOLUTIONS AND NETWORKS OY

Inventor： Karthik Upadhya ,  Stefan Wesemann

IPC: H04L27/34 ,  H03F3/24 ,  H04B1/04

Abstract: An apparatus is provided that includes circuitry for decomposing an input signal to multiple substantially constant-envelope components and an outphasing path for each substantially constant-envelope component. The apparatus also includes a modulator for discrete phase control in each outphasing path, an amplifier in each outphasing path and a combiner for combining output signals from the outphasing paths. A system and method are also provided.