ofdm_modulator.m

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%---------------------------------------------------------------------------
%  OFDM modulator
%  NFFT: FFT length
%  chnr: number of subcarrier
%  G: guard length
%---------------------------------------------------------------------------

function [y] = OFDM_Modulator(data,NFFT,G);

chnr = length(data);
N = NFFT;

x = [data,zeros(1,NFFT - chnr)]; %Zero padding

a = ifft(x); % fft
y = [a(NFFT-G+1:NFFT),a]; % insert the guard interval