KHOJASTEPOUR M A ET AL: 'Quantized linear MIMO precoding for multiuser downlink systems', INFORMATION SCIENCES AND SYSTEMS, 2008. CISS 2008. 42ND ANNUAL CONFERENCE ON, IEEE, PISCATAWAY, NJ, USA, 19 March 2008 (2008-03-19), pages 978 - 983, XP031283004, ISBN: 978-1-4244-2246-3