NDLI: On the Connection of I/Q Imbalance and Channel Equalization in Direct-Conversion Transceivers

Content Provider	IEEE Xplore Digital Library
Author	Rykaczewski, P. Valkama, M. Renfors, M.
Copyright Year	1967
Abstract	Due to its simple structure and reduced requirements for radio frequency filtering, the direct-conversion principle has recently gained a lot of interest in radio transceiver design. This paper considers the so-called inphase/quadrature (I/Q) imbalance problem in such structures under the assumption of frequency-selective transmission channel requiring equalization on the receiver side. It will be shown that I/Q imbalance and channel equalization are strongly interdependent, and thus, I/Q mismatch should be taken into account in the equalizer design, and vice versa, particularly with high-order symbol alphabets. Most importantly, the amount of signal distortion caused by transmitter and receiver I/Q imbalances to the equalized received signal will be analytically analyzed through signal-to-interference ratio (SIR) analysis. This gives a quantitative measure to analyze and judge the role of I/Q imbalances in practical communication system design, without having to resort to lengthy data simulations. Furthermore, the analysis shows that imbalance levels that are tolerable in additive white Gaussian noise channels can turn into a serious problem in multipath channels requiring equalization. This gives further motivation and invaluable insight in the overall receiver and system design and in developing digital signal processing-based techniques to mitigate the I/Q imbalance effects on the receiver side. In general, the analytical outcomes and results are verified using extensive computer simulations.
Sponsorship	IEEE Vehicular Technology Society
Starting Page	1630
Ending Page	1636
Page Count	7
File Size	805258
File Format	PDF
ISSN	00189545
Volume Number	57
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-05-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Signal analysis Radio frequency Filtering Radio transceivers Receivers Equalizers Radio transmitters Distortion measurement Q measurement Length measurement software defined radio Channel equalization digital radios direct-conversion architecture inphase/quadrature (I/Q) imbalance multipath profile radio transceivers signal-to-interference ratio (SIR) channel equalization digital radio I/Q imbalance signal-to-interference ratio
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Automotive Engineering Computer Networks and Communications Electrical and Electronic Engineering Aerospace Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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