NDLI: Gradient-based blind iterative techniques for I/Q imbalance compensation in digital radio receivers

Content Provider	IEEE Xplore Digital Library
Author	Anttila, L. Valkama, M. Renfors, M.
Copyright Year	2007
Description	Author affiliation: Tampere Univ. of Technol., Tampere (Anttila, L.; Valkama, M.; Renfors, M.)
Abstract	This paper considers the radio implementation related I/Q imbalance problem and its digital compensation in direct-conversion and low-IF type radio receivers. In general, I/Q imbalances result in mirror-frequency interference and can severely limit the receiver dynamic range and sensitivity, if not taken properly into account. Here the compensation algorithm developments build on the so-called circular nature of complex-valued communications waveforms which is known to hold only under perfect I/Q balance. A well-behaving non-circularity measure is first formed which is then minimized iteratively using gradient-descent type approach. The derived compensator is computationally simple and operates blindly on the received signal, meaning that no known training or pilot data is needed. The compensation performance of the proposed method is analyzed using extensive computer simulations and is shown to outperform the state-of-the-art adaptive reference techniques by several dB's, when measured in terms of the obtained overall mirror-frequency attenuation.
Starting Page	1
Ending Page	5
File Size	341284
Page Count	5
File Format	PDF
ISBN	9781424409549
DOI	10.1109/SPAWC.2007.4401299
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-17
Publisher Place	Finland
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Digital communication Receivers OFDM modulation Interference Iterative algorithms Attenuation Digital signal processing Signal processing algorithms Communications technology Dynamic range mirror-frequency interference Adaptive filtering circular random signals complex (I/Q) signals digital radios direct-conversion transceivers I/Q imbalance
Content Type	Text
Resource Type	Article

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