Invention Grant
- Patent Title: Adaptive downlink multi user multiple input multiple output (MU-MIMO)precoding using uplink signal subspace tracking for active antenna systems AAS
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Application No.: US17055806Application Date: 2018-06-29
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Publication No.: US11451274B2Publication Date: 2022-09-20
- Inventor: Amr El-Keyi , Svante Bergman , Yongquan Qiang
- Applicant: Telefonaktiebolaget LM Ericsson (publ)
- Applicant Address: SE Stockholm
- Assignee: Telefonaktiebolaget LM Ericsson (publ)
- Current Assignee: Telefonaktiebolaget LM Ericsson (publ)
- Current Assignee Address: SE Stockholm
- Agency: Christopher & Weisberg, P.A.
- International Application: PCT/IB2018/054861 WO 20180629
- International Announcement: WO2019/220188 WO 20191121
- Main IPC: H04B7/0456
- IPC: H04B7/0456 ; H04B7/0452 ; H04B15/00

Abstract:
A method, base station and user equipment are disclosed. A base station configured to communicate with a plurality of user equipments is provided. The base station includes processing circuitry configured to: track a downlink signal subspace for each UE of the plurality of UEs, and determine a Multi-User Multiple-Input Multiple-Output, MU-MIMO, precoders based on the downlink signal subspace for each UE of the plurality of UEs. The MU-MIMO precoders are configured to at least in part suppress intra-cell MU-MIMO interference.
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