Memoryless spectrum correction algorithm for non-ideal I/Q...

Details Memoryless spectrum correction algorithm for non-ideal I/Q... Memoryless spectrum correction algorithm for non-ideal I/Q...

2007-03-13

2007-03-13

Ha, Dac V. (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S324000, C375S340000, C375S346000, C329S304000, C329S349000, C329S351000, C455S285000, C455S302000

Reexamination Certificate

active

11280404

ABSTRACT:
An algorithm for correcting the output of an analog I/Q demodulator without the need for calibration or storing state information. The output of the analog I/Q demodulator is digitized, and the discrete-time samples are divided into segments. A digital frequency transform (e.g., a Discrete Fourier Transform) is computed for each segment. The effects of the non-ideal I/Q demodulator are removed by identifying a set of image frequency candidates for each digital frequency transform, and for each image frequency candidate, estimating a set of demodulator imbalance parameters to characterize the demodulator imbalance at that frequency and correcting the digital frequency transform at the image frequency candidate using the imbalance parameters in order to minimize the effects of the imbalance. Each digital frequency transform is corrected independently and consequently no persistent state information needs to be saved between transforms.

REFERENCES:
patent: 6560449 (2003-05-01), Liu
patent: 6725023 (2004-04-01), Kasperkovitz
patent: 6765623 (2004-07-01), Parker
patent: 6778594 (2004-08-01), Liu
patent: 2003/0231726 (2003-12-01), Schuchert et al.
Liu et al. “A Spectral Correction Algorithm for I-Q Channel Imbalance Problem” , 2001 IEEE, pp. 334-338.

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