Apparatus and method for transmitting and receiving signal of ofdm system

An apparatus for transmitting a signal of an OFDM system, the apparatus comprising:

• a mapper that modulates a source bit to a symbol signal;
• an inverse Fourier transformer that performs inverse Fourier transform of the symbol signal;
• a signal distribution converter that converts a distribution of the signal in which inverse Fourier transform is performed;
• and
• a transmitter that transmits the signal having a converted distribution.

A method of receiving a signal of an OFDM system, the method comprising:

• estimating a phase value of a received signal;
• expanding the received signal using the estimated phase value;
• and
• performing a Fourier operation of the expanded signal and demodulating the signal in which a Fourier operation is performed.