Patent ID: 8228810
Filing Date: 2012-07-24
Classification: H04B,H04L

Abstract:
1. A base station included in a Multiple-Input Multiple-Output (MIMO) communication system configured to transmit or to receive data via a plurality of antennas with respect to a plurality of user terminals, the base station comprising: a first channel quality information (CQI) receiving unit configured to receive first CQI from one of the user terminals when the transmission rank is any one of 1 and a maximum allowance value, the first CQI being associated with a beamforming vector selected by the user terminal; and a second CQI generating unit configured to: calculate a lower bound of a second CQI for an actual transmission rank based on the first CQI; and generate the second CQI by correcting the first CQI with the lower bound of the second CQI, wherein the transmission rank of one user terminal is different from the transmission rank of another user terminal; wherein the second CQI is generated based on interference caused by a remaining beamforming vector.