Kenichi Kobayashi Tomoaki Ohtsuki Toshinobu Kaneko Precoding for MIMO Systems in Line-Of-Sight (LOS) Environment. 4370-4374 2007 GLOBECOM http://dx.doi.org/10.1109/GLOCOM.2007.831 conf/globecom/2007 db/conf/globecom/globecom2007.html#KobayashiOK07