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公开(公告)号：US11323164B2
公开(公告)日：2022-05-03
申请号：US17069100
申请日：2020-10-13
Inventor： Seung Eun Hong , In Kyeong Choi , Tae Gyun Noh
IPC: H04B7/02 , H04B7/0456 , H04B7/024 , H04B7/06
Abstract: An operation method of a first AN for a hybrid beamforming-based cooperative transmission in a C-RAN includes obtaining a spatial channel covariance with terminals subject to a service; selecting a set of terminals to be serviced from among the terminals subject to the service; determining a radio frequency (RF) precoding matrix by which interference between the terminals to be serviced is minimized; transferring information on the determined RF precoding matrix to a centralized processor (CP); and generating an effective channel by configuring an RF precoder based on the determined RF precoding matrix.
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公开(公告)号：US11038559B2
公开(公告)日：2021-06-15
申请号：US16690658
申请日：2019-11-21
Inventor： Min Hyun Kim , Tae Gyun Noh , In Kyeong Choi , Seung Eun Hong
Abstract: Disclosed are methods for transmitting and receiving beamforming-based signals in a communication system. An operation method of a terminal may comprise transmitting capability information of the terminal to an AN; receiving first configuration information of a network cluster configured based on the capability information from the AN; transmitting an SRS in a beamforming scheme through resources indicated by the first configuration information; receiving second configuration information of a user cluster configured based on a measurement result of the SRS from the AN; and performing cooperative communication with ANs belonging to the user cluster, which are indicated by the second configuration information. Accordingly, the performance of the communication system can be improved.
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3.发明授权公开(公告)号：US10833736B2
公开(公告)日：2020-11-10
申请号：US16691658
申请日：2019-11-22
Inventor： Seung Eun Hong , Min Hyun Kim , Tae Gyun Noh , In Kyeong Choi
Abstract: A hybrid beamforming based cooperative transmission system may comprise comprising a centralized processor (CP), access nodes (ANs) connected to the CP, and fronthaul links connecting the CP to the ANs. The CP may provide an outer precoding matrix for a first AN of the ANs, which is derived from global statistical channel state information (CSI) generated from local statistical CSI collected from the ANs, to the first AN via the fronthaul link; and the first AN may configure a radio frequency (RF) precoder of the first AN based on the outer precoding matrix, and configure a digital precoder of the first AN based on local instantaneous effective CSI between the first AN and first terminals to be served by the first AN.
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