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%% Symbols to FFT
function [re im]= sym2fft(symbols, size_of_fft)
%%num_subcarriers = size(symbols,2);
input = [ 0 symbols(1:(num_subcarriers/2)) zeros(1,size_of_fft-num_subcarriers-1) symbols((num_subcarriers/2)+1:num_subcarriers) ];
output = ifft(input);re = real(output);
im = imag(output);end
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