The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 18, 2021
Filed:
Jan. 19, 2017
Indian Institute of Technology Hyderabad, Sangareddy, IN;
Kiran Kumar Kuchi, Hyderabad, IN;
INDIAN INSTITUTE OF TECHNOLOGY, HYDERABAD, Telangana, IN;
Abstract
Embodiments herein provide a method implemented in a cloud radio access network (C-RAN). The method includes transmitting channel state information (CSI) reference signals to plurality of user equipments (UEs). The method includes receiving a measured downlink (DL) CSI from each UE among the plurality of UEs. The DL CSI corresponds to a plurality of antenna ports associated with a set of remote radio heads (RRHs) in cluster. Further, the method includes estimating an uplink (UL) CSI for each UE antenna port. The UL CSI is estimated using a pre-defined pilot structure received from each UE. The DL CSI or UL CSI is defined with respect to BS and UE antenna port pair. Furthermore, the method includes deriving a calibration coefficient for each antenna port based on measured DL CSI and estimated UL CSI. The calibrated DL CSI is used to precoder the data using a linear or non-linear precoder.