Jian Qi Sonia Aïssa Analysis and compensation for the joint effects of HPA nonlinearity, I/Q imbalance and crosstalk in MIMO beamforming systems. 1562-1567 2011 WCNC https://doi.org/10.1109/WCNC.2011.5779363 conf/wcnc/2011 db/conf/wcnc/wcnc2011.html#QiA11