Michael Petit, Werner Haselmayr, Andreas Springer,
"Blind Compensation of I/Q Filter Imbalance in the LTE Downlink"
: Proc. of the 11th European Wireless Conference, 2011, Seite(n) 1 - 7, 7-2011, ISBN: 978-3-8007-3343-9
Original Titel:
Blind Compensation of I/Q Filter Imbalance in the LTE Downlink
Sprache des Titels:
Englisch
Original Buchtitel:
Proc. of the 11th European Wireless Conference, 2011
Original Kurzfassung:
In direct conversion receivers differences of the analog components in the I- and the Q-branch lead to I/Q mismatch. Digital signal processing can be used to reduce the specification for the RF circuitry. In this paper we focus on the compensation of frequency dependent I/Q mismatch due to different cut-off frequencies of the lowpass filters. This mismatch, which is an issue due to the wide bandwidth used e. g. in LTE systems, is compensated with a second order statistic-based approach. The blind adaptive algorithm recovers a property of complex signals, called properness which is disturbed by the I/Q mismatch. The algorithm achieves a very good performance even with a mismatched upconversion stage. It is able to compensate cut-off differences higher than 10% and is independent of special pilot structures and Rayleigh fading channels.
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