MATLAB Answers

ber vs snr ofdm using fft and ifft

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salad9996
salad9996 on 7 Dec 2019
Answered: Roshni Garnayak on 11 Dec 2019
clc
clear
close all
%1
L=32;
m=(sign(randn(1,L))+1)/2;
%2
symbols = [-1i, -1, 1, 1i];
m2 = reshape(m, 2, []);
idx = m2(1,:) * 2 + m2(2,:) +1;
x = symbols(idx);
%3
S=16;
N=log2(S);
s=ifft(x);
%4
SNR_dB=[0:20];
for i=1:length(SNR_dB)
w(i,:)=sqrt(10.^(-SNR_dB(i)/10));
n=w*(randn(1,S)+1i*randn(1,S));
r=s+n;
x_=fft((r));
m1_=real(x_);
m2_=imag(x_);
end
%
% semilogy(SNR_dB,SER,'-b.');
% title('SER VS SNR')
% xlabel(' SNR(dB) ');
% ylabel(' SER ');
% grid on;
Hey guys, im struggling on the BER VS SNR plot. I have different range of SNR and trying to demapping to original signal. How can I do that? I'm struggling on getting the correct BER.

Answers (1)

Roshni Garnayak
Roshni Garnayak on 11 Dec 2019
Refer to the following link for examples and workflows for plotting bit error rate with respect to signal-to-noise ratio:

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