Mahmood Mazrouei-Sebdani Witold A. Krzymien Sum Rate of p-Sphere Encoding for MIMO Broadcast Channels with Reduced Peak Power. 1-5 2012 VTC Spring https://doi.org/10.1109/VETECS.2012.6240324 conf/vtc/2012s db/conf/vtc/vtc2012s.html#Mazrouei-SebdaniK12