Keigo Takeuchi Ralf R. Müller Mikko Vehkaperä Toshiyuki Tanaka 0003 Practical signaling with vanishing pilot-energy for large noncoherent block-fading MIMO channels. 759-763 2009 ISIT https://doi.org/10.1109/ISIT.2009.5205640 conf/isit/2009 db/conf/isit/isit2009.html#TakeuchiMVT09