Keigo Takeuchi Mikko Vehkaperä Toshiyuki Tanaka 0003 Ralf R. Müller Replica analysis of general multiuser detection in MIMO DS-CDMA channels with imperfect CSI. 514-518 2008 ISIT https://doi.org/10.1109/ISIT.2008.4595039 conf/isit/2008 db/conf/isit/isit2008.html#TakeuchiVTM08