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

Claim 0:
1. A communication device for providing an explicit channel state information, CSI, feedback in a wireless communication system, the communication device comprising:
a transceiver configured to receive, 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, and
a processor configured to
estimate 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,
construct a frequency-domain channel tensor using the CSI estimate,
perform a higher-order principal component analysis, HO-PCA, on the channel tensor,
identify a plurality of dominant principal components of the channel tensor, thereby acquiring a compressed channel tensor, and
report to the transmitter the explicit CSI comprising the dominant principal components of the channel tensor.