Patent ID: 8102831

Claim:
A radio transmission apparatus comprising: a spreading section that spreads each of a plurality of transmission signals to generate chip data sequences; a first multiplexing section that (i) groups the chip data sequences into a plurality of sequence groups, and (ii) generates code multiplexed signals, wherein each one of the code multiplexed signals corresponds to one of the sequence groups and is generated by adding some chip data sequences in the corresponding one of the sequence groups; a second multiplexing section that assigns each of the code multiplexed signals to a group of subcarriers by performing orthogonal frequency division multiplexing on each of the code multiplexed signals; a transmitting section that transmits, using a plurality of antennas, subcarrier groups to which the code multiplexed signals have been assigned, so that a first subcarrier group and a second subcarrier group are respectively transmitted through different antennas of the plurality of antennas, wherein, the first subcarrier group is a group of subcarriers to which a first code multiplexed signal has been assigned by said first multiplexing section, the second subcarrier group is a group of subcarriers to which a second code multiplexed signal has been assigned by said second multiplexing section, and the second code multiplexed signal has been generated by adding fewer chip data sequences than the first code multiplexed signal by said first multiplexing section.