Shahab Sanayei Ahmadreza Hedayat Aria Nosratinia Space-time codes in keyhole channels: analysis and design. 3768-3772 2004 GLOBECOM https://doi.org/10.1109/GLOCOM.2004.1379073 conf/globecom/2004 db/conf/globecom/globecom2004.html#SanayeiHN04