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Fourier Transform (Spectrum) of QPSK and BPSK?

Discussion in 'Electronic Design' started by [email protected], Nov 12, 2006.

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  1. Guest

    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!).

  2. Guest

    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.

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