Not enough input arguments for awgn function

Hi,I'm very new to the MATLAB and I just got a question, the code is for generate a random signal and then add a white noise to it:

%define variables
N = 10;
k = 1;
fc = 2000;

%create a random binary stream of N bits
data = randi([0 1],N,1);
%sample at 8 samples/bit (8*N samples)
for i = 1:N
    for j = 1:8
        y(k) = data(i);
        k = k+1;
    end
end

%modulate the sampled signal
t = linspace(0,0.8*N,8*N); 
z = y.*cos(2*pi*fc*t);

g = awgn(z,snr,'measured');

after that, it tells me:

Error using snr (line 84)
Not enough input arguments.

Does anyone knows How to solve that?

Answer 1

[Walter Roberson]

awgn() expects you to pass a numeric value for the signal to noise ratio. Instead in that position you mention snr . snr happens to be the name of a function, so MATLAB tries to invoke the function at that point. But the function needs arguments...

You should be assigning a value to snr before you call awgn.

[qianhui zhou]

Thank you!