Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Reexamination Certificate
2006-05-31
2008-11-25
Chang, Daniel D (Department: 2819)
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
C375S346000
Reexamination Certificate
active
07456683
ABSTRACT:
An amplitude error compensating device comprises an amplitude correcting section for performing amplitude correction with respect to an in-phase component and a quadrature component of a complex signal obtained by quadrature demodulation, based on amplitude error information, and outputting a resultant amplitude-corrected complex signal, and an amplitude error detecting section for obtaining the amplitude error information, depending on amplitudes of an in-phase component and a quadrature component of the amplitude-corrected complex signal. The amplitude error detecting section comprises a power difference calculating section for obtaining as a power error a difference in power between the in-phase component and the quadrature component of the amplitude-corrected complex signal, a rotation detecting section for detecting a rotation of a signal point of the amplitude-corrected complex signal, an error information control section for outputting the power error when a rotation of the signal point has been detected, and 0 when a rotation of the signal point has not been detected, and a smoothing section for smoothing an output of the error information control section, and outputting the result as the amplitude error information.
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Soga Shigeru
Takano Haruka
Chang Daniel D
McDermott Will & Emery LLP
Panasonic Corporation
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