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Joint calibration of frequency selective time variant I/Q-imbalance and modulator DC-offset error in broadband direct-conversion transmitters

: Jian, L.; Kortke, A.; Keusgen, W.


University of Electronic Science and Technology of China -UESTC-, Chengdu; Institute of Electrical and Electronics Engineers -IEEE-:
2009 International Conference on Communications, Circuits and Systems, ICCCAS 2009 . Proceedings. Vol.1 : Crowne Plaza Hotel, Milpitas, San Jose, California, USA and Jin Niu Hotel, Chengdu City, Sichuan, China, 23 - 25 July 2009
Piscataway, NJ: IEEE, 2009
ISBN: 978-1-424-44886-9
ISBN: 978-1-4244-4888-3
International Conference on Communications, Circuits and Systems (ICCCAS) <7, 2009, Milpitas/Calif., San Jose/Calif., Chengdu>
Fraunhofer HHI ()
convertor; modulator; transceiver; power amplifier

Recently, much attention has been paid to frequency selective I/Q-imbalance, which can seriously limit the performance of broadband direct-conversion transceivers and degrade the baseband pre-linearization of the power amplifier in the transmitter. This paper addresses the issue of joint calibration of frequency selective I/Q-imbalance and modulator DC-offset error in the transmitter. The presented parameter estimation requires no pilot signal, making the calibration "semi-blind" and standard-independent. The proposed digital pre-equalization is very simple. Moreover, the I/Q-imbalance is modeled as slowly time-variant and a seamless I/Q-imbalance and DC-offset error parameter tracking algorithm is developed. The effectiveness of the proposed algorithms is verified by numerical simulations.