NDLI: Prototype implementation and RF performance measurements of DSP based transmitter I/Q imbalance calibration

Content Provider	IEEE Xplore Digital Library
Author	Kiayani, A. Anttila, L. Myllari, O. Valkama, M.
Copyright Year	2010
Description	Author affiliation: Tampere University of Technology/Department of Communications Engineering, Finland (Kiayani, A.; Anttila, L.; Myllari, O.; Valkama, M.)
Abstract	Communication transceivers utilizing the inphase/ quadrature (I/Q) up- and down-conversion principle face a common problem of amplitude and phase mismatch. These mismatches result in the generation of an image signal and thus, cause mirror-frequency interference. Moreover, quadrature modulation/demodulation errors also affect the performance of pre-distortion based power amplifier linearization techniques. This article addresses the problem of frequency-dependent I/Q mismatch in direct-conversion radio transmitters and investigates the performance of a DSP-based compensation algorithm with simulations and practical RF measurements. We first review the analytical equations to describe the impact of gain and phase imbalance on the transmitted RF signal. Then, a digital predistortion structure coupled with a technique to efficiently estimate the I/Q mismatch and the needed pre-distortion parameters are discussed. It is shown with simulations and practical measurements that the compensation algorithm produces very good calibration results.
Starting Page	484
Ending Page	489
File Size	1249256
Page Count	6
File Format	PDF
ISBN	9781424488582
e-ISBN	9781861353696
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-07-21
Publisher Place	United Kingdom
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radio frequency Baseband Frequency modulation Radio transmitters Bandwidth Frequency measurement
Content Type	Text
Resource Type	Article

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