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Topic Title: IFFT and FFT in OFDM
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Created On: 17 December 2013 09:28 AM
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 17 December 2013 09:28 AM
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Joined: 17 December 2013

I'm developing an OFDM system. I'm in my initial stage. There I have taken 4 transmission symbols. I have done zero padding according to IFFT size and to get a real signal I have taken the symmetry of that. The problem is I'm not receiving the same transmitting bit stream after doing IFFT and FFT. Pls correct my code. Thank You.

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n = 4;
n_bits = 2^n; %Number of bits to process
M = 4; %Size of the signal constellation
m = log2(M); %Number of bits per symbol
IFFT_size = 2^6; %Size of overall usable symbol size (without cyclic prefix)

num_zeros = (IFFT_size/2)-4; %Number of zeros

z_zero =[1;2;3;4;zeros(num_zeros,1)]; %Zero-Padding
z_symmetry = flipud(z_zero); %Taking symmetry to get a real signal
z_full = [z_zero;0;z_symmetry(1:length(z_symmetry)-1)];

z = ifft(z_full);
w = fft((z));

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