Question

Using a MATLAB program,

Create a function graph (function, xmin, xmax) that draws a graph within a given range of x values (xmin to xmax).

Answer 1

snr=0:1:15;
for ii=1:length(snr)
    x=randint(1,100000); % Generating bits
    y=pskmod(x,2); % Generating BPSK modulated data
    ynoisy=awgn(y,snr(ii)); % Adding AWGN noise to data
    z=pskdemod(ynoisy,2); % Demodulating
    error(ii)=length(find(x-z~=0));
end
semilogy(snr,error)
hold
snr=0:1:15;
for ii=1:length(snr)
    x=randint(1,100000); % Generating bits
    y=pskmod(x,4); % Generating QPSK modulated data
    ynoisy=awgn(y,snr(ii)); % Adding AWGN noise to data
    z=pskdemod(ynoisy,4); % Demodulating
    error(ii)=length(find(x-z~=0));
end
semilogy(snr,error)
grid