Patent ID: 11876589
Assignee: FRAUNHOFER GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 21:
22. A method for providing by a communication device in a wireless communication system an explicit channel state information, CSI, feedback, the method comprising:
receiving, from a transmitter a radio signal via a radio time-variant frequency MIMO channel, the radio signal comprising downlink reference signals according to a reference signal configuration, and downlink signals comprising the reference signal configuration,
estimating the CSI using measurements on the downlink reference signals of the radio channel according to the reference signal configuration over one or more time instants/slots,
constructing a frequency-domain channel tensor using the CSI estimate,
performing a high-order principal component analysis, HO-PCA, on the channel tensor,
identifying a plurality of dominant principal components of the channel tensor, thereby acquiring a compressed channel tensor, and
reporting the explicit CSI comprising the dominant principal components of the channel tensor from the communication device to the transmitter.