Provided are a transmitting system including a pulse amplitude modulator section that pulse amplitude modulates an input signal into a set of first and second pulse amplitude modulated signals, a first frequency signal output section that outputs a first frequency signal, a first amplitude shift keying modulator section that amplitude shift keying modulates, using the first frequency signal, the first pulse amplitude modulated signal into an amplitude shift keying modulated signal, an adder section that adds together the amplitude shift keying modulated signal and the second pulse amplitude modulated signal to generate a transmission signal, and a transmitter section that transmits the transmission signal, a transmitting method, a receiving system for receiving the signal transmitted from the transmitting system and a receiving method.