Patent ID: 8130861

Claim:
A radio communication apparatus comprising: a transmitting unit configured to transmit, to a receiving apparatus, first data and second data from a plurality of antennas for spatial-multiplexing using a plurality of blocks, into which a plurality of consecutive subcarriers in a frequency domain are divided; and a receiving unit configured to receive a first absolute channel quality indicator (CQI) value and a relative CQI value which are transmitted from the receiving apparatus, wherein, at the receiving apparatus, the first absolute CQI value is calculated per each of the blocks for the first data, a second absolute CQI value is calculated per each of the blocks for the second data, and the relative CQI value of the second absolute CQI value is calculated with respect to the first absolute CQI value, per each of the blocks, from the first absolute CQI value and the second absolute CQI value in the same block, and wherein, at the receiving apparatus, the relative CQI value of the second absolute CQI value in the first block of the plurality of blocks for the second data is calculated with respect to the first absolute CQI value in the first block of the plurality of blocks for the first data, and the relative CQI value of the second absolute CQI value in the second block of the plurality of blocks for the second data is calculated with respect to the first absolute CQI value in the second block of the plurality of blocks for the first data.