Power calculation of various frequency components in a time varying signal

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Arsalan
Arsalan 2013-1-12
Hi,
Just wanted to see if I am carrying out an apporporiate steps to achieve my aim.
I am have time varying signal x(t) or as defined in matlab "x" with multiple frequency components, which represents an electrical signal in mA. I am interested to see the resulting power contained at various frequencies in dBm or watts.
My method is as follows:
.to get the time varying power I write y=(x^2)*Resistance
.get the frequency spectrum of y as maybe yf=fft(y)
.and finally use yf to find the power at frequncies needed which should be in Watts
is this a correct method, if not what would you suggest.
Arsalan

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回答（1 个）

Daniel Shub
Daniel Shub 2013-1-13
Seems reasonable enough.

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