Patent ID: 7764712

Claim:
A radio transmission apparatus comprising: a modulation section that modulates a data signal that has zero or one inserted at the head of a data signal superimposed on one modulation symbol using a predetermined modulation scheme to obtain a modulation symbol; a generation section that generates an inverted symbol inverting positive/negative signs of a value of an I component and a value of a Q component of the modulation symbol or generates a mapping change symbol by, in right quadrants or left quadrants on a Q axis on an IQ plane in which the modulation symbol is mapped, symmetrically moving the modulation symbol centering around a point of symmetry that indicates an average value of the I component of each adoptable signal point in the predetermined modulation scheme; and a multiplexing section that multiplexes the modulation symbol, and the inverted symbol or the mapping change symbol to obtain a multiplexed signal.