Patent ID: 7006429

Claim:
A transmitter in a multi-carrier transmission system for conducting communications using a modulation method for dividing a transmission band into a plurality of sub-carriers and mapping each sub-carrier using a complex signal point expressed by k bits, comprising: an encoding unit converting transmitting data information, the number of bits of which is smaller than kn bits, which are data used to express n sub-carriers, into a signal point pattern, in which the peak power of a transmitting signal is small, of signal point patterns expressed by the kn bits, the encoding unit further comprising a sub-carrier generation unit generating sub-carriers composed of signal points in which the signal point pattern with a small peak power is divided into two orthogonal groups in four quadrants of an IQ plane and in which the signal point of the part of sub-carriers has a prescribed correlation with a signal point of another sub-carrier; and a mapping unit generating transmitting signals of n sub-carriers using an output of the encoding unit.