" EURECOM, Sophia-Antipolis, France. [53] V. Stankovic and M. Haardt, "Multi-User MIMO Downlink Precoding for users with multiple antennas." Proceedings of the 12th meeting of the Wireless World Research Forum (WWRF), Toronto, Canada, (November 2004). [54] Q.H. Spencer, A.L. Swindlehurst, M. Haardt, "Zero-Forcing Methods for Downlink Spatial Multiplexing in Multiuser MIMO Channels." IEEE Transactions on Signal Processing vol. 52 (No. 2) (February 2004). CHAPTER 10 The IEEE 802. 16m Physical Layer (Part II) [55] Nihar Jindal, "MIMO Broadcast Channels with Finite-Rate Feedback." IEEE Transactions on Informa- tion Theory vol. 52 (No. 11) (November 2006). [56] Quentin H. Spencer, Christian B. Peel, A. Lee Swindlehurst, Martin Haardt, "An Introduction to the Multi-User MIMO Downlink." IEEE Communications Magazine, October 2004. [57] David Gesbert, et al., "Shifting the MIMO Paradigm." IEEE Signal Processing Magazine (September 2007). [58] Lu Wei, "Capacity of Hybrid Open-loop and Closed-loop MIMO with Channel Uncertainty at Trans- mitter." ESPOO, Helsinki University of Technology, March 2008. [59] David J. Love and Robert W. Heath Jr., "Grassmannian Precoding for Spatial Multiplexing Systems." Proc. of the Allerton Conference on Communication Control and Computing, Monticello, October 2003. [60] Tetsushi Abe, Gerhard Bauch, "Differential Codebook MIMO Precoding Technique." 2007 IEEE Global Telecommunications Conference, 2007. [61] Bernd Bandemer, Martin Haardt, Samuli Visuri, "Linear MMSE Multi-User MIMO Downlink Precoding for Users with Multiple Antennas," 17th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC '06), 2006. Gavin Mitchell, Frank R. Kschischang, "An Augmented Orthogonal Code Design for the Non-coherent MIMO Channel," 24th Biennial Symposium on Communications, June 2008. [63] Yong Fan, Petteri Lundén, Markku Kuusela and Mikko Valkama, "Efficient Semi-Persistent Scheduling for VoIP on EUTRA Downlink." IEEE 68th Vehicular Technology Conference, VTC 2008, Fall 20