Wideband quadrature imbalance compensation system and method

Details Wideband quadrature imbalance compensation system and method Wideband quadrature imbalance compensation system and method

2008-01-29

2010-06-29

Kinkead, Arnold (Department: 2817)

Modulators

Phase shift keying modulator or quadrature amplitude modulator

C329S304000, C329S336000, C329S345000, C329S347000, C375S308000, C375S329000

Reexamination Certificate

active

07746186

ABSTRACT:
Compensating for wideband quadrature imbalance error by introducing inverse complex inputs to phase quadrature estimator filters to generate estimated quadrature distortion; summing estimator quadrature distortion with a delayed version of the actual complex input to obtain estimated quadrature output; comparing the output with the true output to obtain residual quadrature imbalance error; applying a least mean square to the inverse input and imbalance residual error to obtain an updated estimate of filter coefficients; updating the filter coefficients of the phase quadrature estimator; and updating the filter coefficients of a phase quadrature compensator with the filter coefficients of the phase quadrature estimator to obtain a quadrature output pre-compensated for quadrature imbalance error.

REFERENCES:
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patent: 2007/0211837 (2007-09-01), Zipper
patent: 2008/0143562 (2008-06-01), Huang et al.
J Cavers “New Method for Adaptation of Quadrature Modulators and Demodulators in Amplifier Linearization Circuits”, IEEE Transactions on Vehicular Technology, vol. 46, pp. 707-716, No. 3, Aug. 1997.

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