Systems and methods of using IQ modulation for calibration...

Details Systems and methods of using IQ modulation for calibration... Systems and methods of using IQ modulation for calibration...

2003-04-02

2008-07-08

Wang, Ted (Department: 2611)

Pulse or digital communications

Transmitters

Angle modulation

C375S324000, C375S340000, C375S224000, C324S614000, C702S108000, C702S112000, C702S124000, C702S126000

Reexamination Certificate

active

07397865

ABSTRACT:
A system analyzer may generate an estimated frequency response of a device, system, communication medium, or combination thereof by utilizing a stimulus signal that is robust against IQ modulator impairments. A stimulus generator may be used to generate a plurality of discrete tones according to a frequency spacing and a frequency offset. The frequency spacing and the frequency offset cause spectrally inverted spurs (generated by impairments of the IQ modulator) to occur at frequencies other than frequencies of said modulated signal that are associated with said plurality of discrete tones. Additionally, by implementing a Discrete Fourier Transform (DFT) to possess a frequency resolution equal to the frequency offset, there is no leakage of power associated with the spectrally inverted spurs into frequency bins of the DFT associated with the desired frequency components. Likewise, leakage between the desired frequency components and leakage associated with the local oscillator may be avoided.

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patent: 6452843 (2002-09-01), Zheng et al.
patent: 6940938 (2005-09-01), Altman et al.

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