Adaptive algorithm for increasing image rejection ratio in low-IF receivers

An adaptive method for compensating mismatch effect on an I/Q demodulation is presented. It is based on the correlation between the desired and image band that appears when there is a mismatch in any branch. The proposed algorithm is specially intended for narrowband low-IF receivers. No calibration...

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Published inElectronics letters Vol. 44; no. 6; p. 1
Main Authors Gimeno-Martín, A, Pardo-Martín, J M, Ortega-González, F J
Format Journal Article
LanguageEnglish
Published Stevenage John Wiley & Sons, Inc 13.03.2008
Subjects
Calibration
Demodulation
Narrowband
Noise levels
Receivers
Rejection
Sampling
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Summary:An adaptive method for compensating mismatch effect on an I/Q demodulation is presented. It is based on the correlation between the desired and image band that appears when there is a mismatch in any branch. The proposed algorithm is specially intended for narrowband low-IF receivers. No calibration source is necessary. Up to 91 dB of image rejection ratio is achieved with narrow-bandwidth signals (up to 6.25% of the sampling frequency).
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ISSN:0013-5194
1350-911X