US 12,355,517 B2
Doppler codebook-based precoding and CSI reporting for wireless communications systems
Venkatesh Ramireddy, Erlangen (DE); Markus Landmann, Erlangen (DE); Marcus Großmann, Erlangen (DE); and Sutharshun Varatharaajan, Erlangen (DE)
Assigned to Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Munich (DE)
Filed by Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Munich (DE)
Filed on Apr. 22, 2024, as Appl. No. 18/641,450.
Application 18/641,450 is a continuation of application No. 17/197,562, filed on Mar. 10, 2021, granted, now 11,996,910.
Application 17/197,562 is a continuation of application No. PCT/EP2018/074444, filed on Sep. 11, 2018.
Prior Publication US 2024/0348297 A1, Oct. 17, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04B 7/04 (2017.01); H04B 7/01 (2006.01); H04B 7/0417 (2017.01); H04B 7/0456 (2017.01); H04B 7/06 (2006.01)
CPC H04B 7/0417 (2013.01) [H04B 7/01 (2013.01); H04B 7/0486 (2013.01); H04B 7/0626 (2013.01); H04B 7/0632 (2013.01); H04B 7/0639 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A communication device for providing a channel state information, CSI, feedback in a wireless communication system,
wherein the communication device receives a reference signal resource configuration including a parameter, the parameter indicating a time-domain-repetition of downlink reference signals,
wherein the communication device determines the CSI feedback based on the repeated downlink reference signals and reports the determined CSI feedback,
wherein the communication device determines the CSI feedback by
selecting, based on a performance metric, a Doppler-delay-beam precoder matrix, W, for a composite Doppler-delay-beam three-stage precoder,
the CSI feedback including a precoder matrix indicator, PMI, and a rank indicator, RI,
wherein the Doppler-delay-beam three-stage precoder is based on
a first codebook, Ω1, for one or more spatial beam components of the composite Doppler-delay-beam three-stage precoder,
a second codebook, Ω2, for one or more delay components of the composite Doppler-delay-beam three-stage precoder, and
a third codebook, Ω3, for one or more Doppler-frequency components of the composite Doppler-delay-beam three-stage precoder,
wherein the communication device is configured by the transmitter or another network entity with a first parameter indicating a subset of columns of a DFT or oversampled DFT matrix forming the second codebook, Ω2, and/or with a second parameter indicating a subset of columns of a DFT or oversampled DFT matrix forming the third codebook, Ω3, and
wherein the communication device selects from the second codebook, Ω2, and/or from the third codebook, Ω3, the one or more delay components according to the first parameter and/or the one or more Doppler-frequency components according to the second parameter.