I have declared the variable, but i still get an error message " >> norm_noise_awgn = Noise_awgn​/std_Noise​_awgn; %Normalized signal Undefined function or variable 'Noise_awgn'"

%awgn channels

Noise_awgn = randn(1,N);%Noise production

%AvgPower_Noise_awgn=sum(abs(Signal).^2)/N/snr_avg; %average power of noise

AvgPower_Noise_awgn=sum(abs(Signal).^2)/snr_avg;

std_Noise_awgn = sqrt(AvgPower_Noise_awgn);

Noise_awgn = std_Noise_awgn*Noise_awgn;

norm_signal_awgn = Signal/std_Noise_awgn; %Noramlized signal

>> norm_Noise_awgn = Noise_awgn/std_Noise_awgn; %Normalized signal

Undefined function or variable 'Noise_awgn'.

[Kuifeng]

consider rewrite your question, and reupdate your code with a space in front.

[Kuifeng]

In this code, what is N, snr_avg, Signal?

[Idahoise Beckley]

N=100, snr_avg=power(10,snr_avgdB/10), snr_avgdB=5, and Signal=SignalTone, with SignalTone=5*sin(10*pi*t)=sin(40*pi*t)

[Kuifeng]

what is t? what does it mean by : SignalTone=5*sin(10*pi*t)=sin(40*pi*t)?