Adaptive phase and gain imbalance cancellation

Details Adaptive phase and gain imbalance cancellation Adaptive phase and gain imbalance cancellation

2007-02-06

2007-02-06

Tran, Khai (Department: 2611)

Pulse or digital communications

Receivers

Interference or noise reduction

C375S260000, C375S349000, C375S235000

Reexamination Certificate

active

10338362

ABSTRACT:
A method of canceling gain and phase imbalance including estimating a cancellation parameter based on the signal divided by its complex conjugate, calculating a correction value for the signal using the cancellation parameter, and correcting the signal by subtracting the correction value from the signal. Estimate the cancellation parameter may include performing a stochastic gradient algorithm or a least squares estimate. A cancellation system including a conjugate conversion unit, an estimator, a combiner, a converter, and a subtractor. The estimator estimates a cancellation parameter and the combiner combines the cancellation parameter and the complex conjugate signal to provide a cancellation signal. The converter converts the cancellation signal to a correction signal, and the subtractor subtracts the correction signal from the imbalanced signal to provide a corrected signal. The combiner may be an adaptable tap of a digital signal processing circuit.

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