Yaning Zou Mikko Valkama Markku Renfors Pilot-Based Compensation of Frequency-Selective I/Q Imbalances in Direct-Conversion OFDM Transmitters. 1-5 2008 VTC Fall http://dx.doi.org/10.1109/VETECF.2008.228 conf/vtc/2008f db/conf/vtc/vtc2008f.html#ZouVR08