Patent ID: 7616608

Claim:
An OFDM-CDMA transmitting apparatus comprising: a spreading section that spreads transmit symbols and makes a spreading ratio of a specific transmit symbol larger than a spreading ratio of other transmit symbols; a number of multiplexing selection section that selects a number of multiplexing for each transmit symbol and makes a number of multiplexing for the specific transmit symbol smaller than a number of multiplexing for the other transmit symbols; a multiplexing section that multiplexes spread signals of said each transmit symbol by the selected number of multiplexing; and an orthogonal frequency division multiplexing section that distributes the multiplexed spread signals to a plurality of subcarriers and distributes at least one of chips of the specific transmit symbol whose number of multiplexing has been reduced and chips of the specific transmit symbol whose spreading ratio has been increased, only to subcarriers in a time domain, among subcarriers in a frequency domain, subcarriers in the frequency domain and the time domain, and the subcarriers in the time domain, without widening a frequency band.