FSK mod and demod with fading and noise
3 views (last 30 days)
Show older comments
I'm trying to design FSK modulator and demodulator with noise and flat fading but the graph of snr vs ber with fading in wrong, any idea how to fix it??
clear all;clf;clc;close all;
M = 2;
k = log2(M);
EbNo = 5;
Fs = 16;
nsamp = 17;
freqsep = 8;
n=10000;
msg = randint(n,1,M);
txsig = fskmod(msg,M,freqsep,nsamp,Fs);
ab=abs(txsig);
ps=(sum(ab.^2))/n;
for snr=1:30
pn=10.^(-0.1.*snr).*ps;
noise= sqrt(pn)*randn(1,n*nsamp);
G1=randn(1,n); %generating fading coefficients
G2=randn(1,n);
v= sqrt(power(G1,2)+ power(G2,2));
A=v(2);
theta=2*pi*rand;
alph=A*exp(j*theta);
msg_rx = alph*txsig + noise'; % txsig is 1700x1 and noise is 1x1700, so need transpose
msg_rxx=msg_rx.*(1/A)*conj(alph);
msg_rrx = fskdemod(msg_rxx,M,freqsep,nsamp,Fs);
[num,BER] = biterr(msg,msg_rrx); % Bit error rate
w(snr)=BER;
end
d=[1:30];
figure
semilogy(d,w)
0 Comments
Answers (0)
See Also
Categories
Find more on PHY Components in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!