US 12,489,502 B2
Method and user equipment for determining precoder of MIMO system
Chien-Yi Wang, Hsin-Chu (TW); Jiann-Ching Guey, Hsin-Chu (TW); Cheng-Rung Tsai, Hsin-Chu (TW); and Wei-Yen Wong, Hsin-Chu (TW)
Assigned to MEDIATEK Inc., Hsinchu (TW)
Filed by MEDIATEK INC., Hsin-Chu (TW)
Filed on Aug. 10, 2022, as Appl. No. 17/885,480.
Claims priority of provisional application 63/236,709, filed on Aug. 25, 2021.
Prior Publication US 2023/0064830 A1, Mar. 2, 2023
Int. Cl. H04W 4/00 (2018.01); H04B 7/06 (2006.01)
CPC H04B 7/0626 (2013.01) [H04B 7/0634 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method, comprising:
receiving, by a user equipment (UE), at least one channel state information-reference signal (CSI-RS) from a network;
estimating, by the UE, at least one covariance matrix of at least one downlink channel matrix according to the at least one CSI-RS at different times and frequencies;
transmitting, by the UE, at least one parameter associated with the least one covariance matrix to the network; and
compressing, by the UE, the at least one covariance matrix, wherein the at least one covariance matrix is compressed by:
being projected onto at least one two-dimension (2D) time-frequency basis matrix or onto at least one one-dimension (1D) frequency basis vector; or
being represented as at least one linear combination of 2D sinusoids matrix or as at least one linear combination of 1D sinusoids vector.