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

Claim 8:
9. A base station supporting beam training using a beamforming codebook, the base station comprising:
a transceiver; and
a controller operable connected with the transceiver, the controller configured to:
store a plurality of codebooks corresponding to a plurality of different beamwidths;
receive a beam adjustment request from a user equipment (UE);
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, in response to receiving the beam adjustment request; and
transmit, 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.