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

Claim 18:
19. A wireless communication network, comprising:
at least one 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, and

at least one transmitter comprising:
a plurality of antennas for a wireless communication with the communication device for providing a channel state information, CSI, feedback to the transmitter; and
a precoder connected to the antenna array, the precoder to apply a set of beamforming weights to one or more antennas of the antenna array to form, by the antenna array, one or more transmit beams or one or more receive beams,
a transceiver configured
to transmit, to the communication device, downlink reference signals (CSI-RS) according to a CSI-RS, and downlink signals comprising the CSI-RS configuration; and
receive uplink signals comprising a plurality of CSI reports comprising an explicit CSI from the communication device; and

a processor configured to construct a precoder matrix applied on antenna ports using the explicit CSI.