Modulation/demodulation apparatus and method for tranceiving signal in a wireless communication system

The present invention relates to a modulation / demodulation device and method that allows the distribution of the interference signal to the signal transmission and reception in a wireless communication system of the non-Gaussian (Gaussian) distribution. Modulation method in the transmitter for transmitting a signal in a wireless communication system according to the present invention, the determining the modulation scheme, if the determined modulation scheme corresponding to a particular modulation scheme, a fixed information encoded bit pre-QAM converted into QAM symbols according to a modulation order (Quadrature Amplitude modulation), and the advance in the predetermined sequence set, select the sequence that correspond to the elements of the constant vector, and repeating the QAM symbol by the conversion by the predetermined sequence length, the repeating QAM the process of multiplying a symbol sequence with said selected output signals and includes the step of transmitting the output signal to the receiver.