Fourier Transform (Spectrum) of QPSK and BPSK?

Nov 12, 2006 1 Replies
R

Hi All,



Does anyone have a mathematical derivation of the expected spectrum of a QPSK signal, given a known symbol rate (which is 1/2 the data rate for QPSK)?



The signal i am measuring doesn't have any sideband carrier suppression at all, which is supposed to be a figure of merit for phase and amplitude imbalance of your IQ mixer (how orthogonal or in-quadrature the I and Q channels are).



Thanks for any REAL help (which is Info from someone who isn't pretending to know more than they actually do!).


Slick



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R

The bottom line is I'm trying to measure phase and amplitude imbalance with just a spectrum analyzer, without having to buy an expensive VSA which can display the constellation, and give me EVM, etc.

SLick

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