Power calculation of various frequency components in a time varying signal

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

Answer 1

[Daniel Shub]

Seems reasonable enough.