Not enough input arguments for awgn function

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qianhui zhou
qianhui zhou 2018-4-15
评论： qianhui zhou 2018-4-15
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?

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采纳的回答

Walter Roberson
Walter Roberson 2018-4-15
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.

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