Patent ID: 8787261

Claim:
A base station apparatus comprising: a power control matrix generating section configured to generate a power control matrix reflecting average reception power of each of transmission signals from a plurality of transmission antennas; an update section configured to update a codebook which beforehand defines a plurality of precoding weights corresponding to the power control matrix; a selecting section configured to select precoding weights that maximize throughput or reception SINR obtained after combining the transmission signals from the updated codebook; and a transmission power control section configured to control transmission power of each of the transmission signals corresponding to the precoding weights selected in the selecting section, wherein the power control matrix generating section generates the power control matrix which is a diagonal matrix having the dimension corresponding to the number of transmission antennas, and has average reception power values of the transmission signals from respective transmission antennas in diagonal components of matrix elements, and wherein, when transmission power of a transmission signal determined by the precoding weights selected in the selecting section falls below a predetermined threshold, the transmission power control sections sets the transmission power of the transmission signal at “0”.