Method and apparatus of compensating imbalance of a modulator

Details Method and apparatus of compensating imbalance of a modulator Method and apparatus of compensating imbalance of a modulator

2006-08-15

2006-08-15

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Transmitters

Quadrature amplitude modulation

C375S297000, C375S296000

Reexamination Certificate

active

07092454

ABSTRACT:
Briefly, a method and apparatus to compensate an imbalance of a modulator by providing calibration parameters to a calibration network. The modulator may receive a pair of predetermined sinusoidal in-phase and quadrature signals and output a distorted modulated signal. A processor may process spectral parameters at first and second harmonics of a detected envelope signal of the distorted modulated signal may generate the calibration parameters.

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patent: WO 03/043206 (2003-05-01), None
James A. Cavers and Maria W. Liao, “Adaptive Compensation for Imbalance and Offset Losses in Direct Conversion Transceivers” IEEE Transactions and Vehicular Technology, vol. 42, No. 4, Nov. 1993, pp. 581-588.
Faulkner M. et al., “Automatic Adjustment of Quadrature Modulators”, Electronic Letters, Jan. 31, 1991, pp. 214-216, vol. 27, No. 3, IEE Stevenage, GB.
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PCT Search Report for PCT/US 03/19876, Dated Nov. 6, 2003.

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