Patent ID: 11916626
Assignee: INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YONSEI UNIVERSITY
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 12:
13. A user equipment (UE) performing beam training using a beamforming codebook, the UE comprising:
a transceiver; and
a controller operably connected with the transceiver, the controller configured to:
store a plurality of codebooks corresponding to a plurality of different beamwidths;
transmit a beam adjustment request to a base station;
determine, among the plurality of codebooks, a codebook including beam codebooks for beam coverages including a beamwidth corresponding to a channel state of the UE based on the beam adjustment request; and
perform beam training based on receiving signals that are beamformed through a plurality of transmission beams from the base station using digital beamforming matrixes of the codebook,

wherein each beam codebook qm of the beam codebooks included in the codebook is configured based on a product of a transmission analog beamforming matrix and a baseband digital processing vector that are obtained based on a beam codeword vm for an m-th beam coverage, and
wherein the beam codeword vm is obtained based on a beam gain vector [gm]k corresponding to a k-th over-sampled angle of departure (AoD) and an array steering matrix A.