how to calculate power spectrum from sampled signal

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Derek Eccles on 23 Dec 2015

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https://www.mathworks.com/matlabcentral/answers/261505-how-to-calculate-power-spectrum-from-sampled-signal

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I am having difficulty resolving the differences when I compare the power spectrum for a simple Simulink model (pulse generator, scope and spectrum analyser) and the results I get when I calculate the power spectrum by hand using the DFT equation. See attached pdf for detail.