hi, nice to see u all.

i am a student in Shanghai, China. I am now simulating different kind of mod-demod methods both with matlab and systemview.

a problem is that for one signal sequece, the matlab and systemview caculate and plot different spectrum! i feel puzzled. and then what are power spectrum and power spectrum density? what's the difference?

thank you, all.

best regards.

JohanZhang

i am a student in Shanghai, China. I am now simulating different kind of mod-demod methods both with matlab and systemview.

a problem is that for one signal sequece, the matlab and systemview caculate and plot different spectrum! i feel puzzled. and then what are power spectrum and power spectrum density? what's the difference?

thank you, all.

best regards.

JohanZhang

The spectrums = Fourier Transform of time signal should look very much alike. But the actual time signals used were diffierent which then gives some variations in the spectra.

If you can use the same input data, and the same length FFT. The results

should be identical. In both cases choose mag[FFT^2]

good luck!