MATLAB: Input signal power AWGN block Simulink

communicationdigital signal processingsimulink

Hi,

What should the Parameter Input Signal power in Simulink's AWGN block be? Precisely, what is the way in Simulink that I can measure the power of the Input Signal to the AWGN block?

Best Answer

Dear Sommer,

Documentation of the AWGN Simulink block can be found here. In the Dialog Box you can specify the power of the input signal yourself. (also it depends on your case, how 'stark' the noise is)

To compute the power in Simulink of a signal, you can use this Simulink example.

Good luck! Christiaan

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right click on a signal: Linear Analysis Points/Input Perturbation. You need Simulink Control Design for this.

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With the syntax

    y = awgn(x,snr);

You generate a white noise vector with a variance of

   variance = 10^(-snr/10);
   noise = sqrt(variance)*randn(size(x));

If you use 'measured', then awgn actually measures the signal power.

For example:

x = cos(pi/4*(0:99));
y = awgn(x,5,'measured');

In this case the variance of the additive white noise is:

    sigp = 10*log10(norm(x,2)^2/numel(x));
    snr = sigp-5;
    noisep = 10^(snr/10);
    noise = sqrt(noisep)*randn(size(x));

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