Patent ID: 6980509

Claim:
A transmission apparatus comprising: a plurality of assigning means for assigning independently a plurality of channel data to signal points on a complex plane; each assigning means having a mapping means for coding an input information sequence in accordance with a predetermined coding scheme and mapping the coded input information sequence onto signal points of an orthogonal coordinate space of a complex plane defined by an orthogonal I-axis and Q-axis; a plurality of frequency converting means for converting the frequency of the plurality of signal points output from said plurality of assigning means in response to a center frequency of each channel; a multiplexing means for multiplexing the plurality of signals output from said plurality of frequency converting means; a modulating means for modulating the signal multiplexed by the multiplexing means to an OFDM signal; and a transmitting means for converting the OFDM signal to an RF band signal and transmitting the same.