Lei Zhang Chunhui Zhou Shidong Zhou Xibin Xu Expected Error Based MMSE Detection Ordering for Iterative Detection-Decoding MIMO Systems. 1281-1285 2007 WCNC http://doi.ieeecomputersociety.org/10.1109/WCNC.2007.242 conf/wcnc/2007 db/conf/wcnc/wcnc2007.html#ZhangZZX07