Apparatus and method for transmitting and receiving signal of OFDM system

摘要

A method and apparatus for transmitting an orthogonal frequency division multiplexing (OFDM) signal including converting a distribution of a signal in which inverse Fourier transform is performed in an OFDM system and a method of receiving an OFDM signal including expanding a received signal are provided, and by changing a magnitude distribution of a signal that is output from an OFDM modulator to a bimodal Gaussian distribution, an influence of noise in a receiving terminal can be reduced, and by limiting a signal that is output from an OFDM modulator to an appropriate magnitude, a phase in the receiving terminal can be prevented being wrongly demodulated.

主权项

1. A method of transmitting a signal of an orthogonal frequency division multiplexing (OFDM) system, the method comprising:
modulating a source bit to a symbol signal; performing inverse Fourier transform of the symbol signal; converting a distribution of the signal in which inverse Fourier transform is performed; and transmitting the signal having a converted distribution, wherein the distribution of the signal includes a conversion of an output x[n] from an OFDM modulator to a bimodal distribution (Xproposed c[n]) according to expansion equationxproposed_c⁡[n]=B·Sgn⁡(x⁡[n])·ln(1+u⁢x⁡[n]A)ln⁡(1⁢+⁢u), wherein Sgn(x[n]) is an encoding function, u is a variable corresponding to a magnitude of distortion, B is a variable limiting a maximum and a minimum value of the transmitted signal, and A=
A=max(|x[n]|), n=0, 1, . . . , N−1.