Patent ID: 11916626
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method performed by a base station supporting beam training using a beamforming codebook, the method comprising:
storing a plurality of codebooks corresponding to a plurality of different beamwidths;
receiving a beam adjustment request from a user equipment (UE);
determining, among the plurality of codebooks, a codebook including beam codebooks for beam coverages including a beamwidth corresponding to a channel state of the UE, in response to receiving the beam adjustment request; and
transmitting, to the UE, signals that are beamformed based on the codebook through a plurality of transmission beams 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.