Radio communication apparatus and radio communication method

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 channel quality indicator (CQI) value which is calculated per each of the blocks for each of the first data and the second data at the receiving apparatus and which is transmitted from the receiving apparatus,
• wherein, at the receiving apparatus, a relative CQI value for one of the first data and the second data in a block defined by subcarriers is calculated with respect to an absolute CQI value for the other of the first data and the second data in the same block defined by the same subcarriers, and said receiving unit receives the absolute CQI value and the relative CQI value.

A radio communication method comprising:

• receiving first data and second data, which are transmitted 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;
• calculating a channel quality indicator (CQI) value per each of the blocks for each of the first data and the second data;
• and
• transmitting the CQI value,
• wherein a relative CQI value for one of the first data and the second data in a block defined by subcarriers is calculated with respect to an absolute CQI value for the other of the first data and the second data in the same block defined by the same subcarriers, and the CQI value and the relative CQI value are transmitted.

A radio communication method comprising:

• transmitting, 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
• receiving a channel quality indicator (CQI) value, which is calculated per each of the blocks for each of the first data and the second data at the receiving apparatus and which is transmitted from the receiving apparatus,
• wherein, at the receiving apparatus, a relative CQI value for one of the first data and the second data in a block defined by subcarriers is calculated with respect to an absolute CQI value for the other of the first data and the second data in the same block defined by the same subcarriers, and the CQI value and the relative CQI value are received.

A radio communication apparatus comprising:

• a transmission controlling unit configured to control a transmission of 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 relative channel quality indicator (CQI) value and an absolute CQI value, the relative CQI value for one of the first data and the second data in a block defined by subcarriers being relative to the absolute CQI value for the other of the first data and the second data in the same block defined by the same subcarriers,
• wherein said transmission controlling unit controls the transmission based on the relative CQI value and the absolute CQI value.

A radio communication method comprising:

• controlling a transmission of 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
• receiving a relative channel quality indicator (CQI) value and an absolute CQI value, the relative CQI value for one of the first data and the second data in a block defined by subcarriers being relative to the absolute CQI value for the other of the first data and the second data in the same block defined by the same subcarriers,
• wherein the transmission is controlled based on the relative CQI value and the absolute CQI value.