fading in matlab problem

[bandwidther]

Dear all
i am making a simulation to study the effect of AWGN and Raliegh fading
I make the simulator and add both AWGN and fading
to get results
shall I fix the AWGN and change fading or change both?

 

[Sherra]

for rayleigh:
delay=sort(randint(1,num_path,[1 round(carrier_prefix_length)]))*ts;
pd=sort(randint(1,num_path,[-20 0]),'descend');
h=rayleighchan(ts,fd,delay,pd);

for AWGN:
noisy=awgn(signal,SNR,'measured');