Patent ID: 7016298

Claim:
A transmission apparatus, of orthogonal frequency division multiplexing for multiplexing a plurality of carriers orthogonal to one another for transmitting signals having a transmission band, including a transmission side and a reception side, said transmission side comprising: an input terminal to which said signals are applied; a first modulator coupled with said input terminal for outputting first signals which are main information code signals modulated in accordance with a first modulation scheme; a second modulator for outputting second signals which are auxiliary signals modulated in accordance with a second modulation scheme; and a transmission unit including a distributing circuit coupled with said first and second modulators, said distributing circuit distributing said first and second signals modulated by said first and second modulators to a plurality of predetermined carriers, respectively, so that said second signals are arranged at the positions of all or some of said plurality of predetermined carriers existing within a limited number of carriers close to at least one of both lower and upper ends of said transmission band, and said first signals are arranged at the positions of all or some of the remaining carriers other than said limited number of carriers of said transmission band, and outputting the modulated signals.