Nima N. Moghadam Per Zetterberg Peter Händel Håkan Hjalmarsson Correlation of distortion noise between the branches of MIMO transmit antennas. 2079-2084 2012 PIMRC https://doi.org/10.1109/PIMRC.2012.6362697 conf/pimrc/2012 db/conf/pimrc/pimrc2012.html#MoghadamZHH12