Orthogonal M-FSK SNR vs BER plot
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I am trying to plot the SNR vs BER plot for orthogonal M-FSK mod and demod but the BER remains approximately Zero for all M (2,4,8,16).
Can anyone help me understand where the problem is?
This is the code that I am using:
Rs = 100e6; %Symbol rate 100 MHz
Ts= 1/Rs;
len = 10000;
EbNo = [0:2:30];
SymER = zeros(1,length(EbNo));
M=[2 4 8 16];
%%Orthogonal FSK
for j=1:4
msg = randint(1,len,M(j)); % Random signal
freqsep=Rs; % Tone separation = 1/T for non-coherent orthogonal MFSK
Fs = (M(j)-1)*freqsep; % (M-1)*freq_sep <= Fs.
nsamp = 2*Fs;
txsig = fskmod(msg,M(j),freqsep,nsamp,Fs); % Modulate.
k = log2(M(j));
for i=1:length(EbNo)
msg_rx = awgn(txsig,EbNo(i)+10*log10(k)); % AWGN channel
msg_rrx = fskdemod(msg_rx,M(j),freqsep,nsamp,Fs); % Demodulate
[num,BER(j,i)] = biterr(msg,msg_rrx); % Bit error rate
end
figure(2);semilogy(EbNo,BER(j,:),'bx-');
hold on;
suptitle('Bit Error Rate vs E_b/N_o for Orthogonal MFSK');
xlabel('E_b/N_o (dB)'),ylabel('Bit Error Probability, P_E(M)');
grid on
BER_theory = berawgn(EbNo,'fsk',M(j),'noncoherent'); % Theoretical BER
semilogy(EbNo,BER_theory,'ro:');
end
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