Multiple antenna (MIMO) techniques are an essential component of any contemporary wireless communication system because they can significantly improve the performance over conventional single-antenna links. While MIMO techniques are relatively well understood at the link level, the interaction of multiple MIMO links and their impact on performance at the system level necessitate fundamentally new investigations. We propose a book that investigates the theoretical foundations of MIMO networks consisting of multiple simultaneous MIMO links and applies these principles in the design of next-generation wireless networks. About ten years ago, the information theoretic foundations of MIMO techniques were developed and showed the promise of using multiple antennas at both the transmitter and receiver of a wireless link. An enormous amount of research ensued to develop practical techniques for achieving these promised gains. Within the last few years, the information theory community has again made significant breakthroughs, this time in the understanding of multiuser MIMO systems. Currently in industry, new wideband wireless standards, including EV-DO Rev C, UMTS LTE, and WiMax, are under development to meet the insatiable demands for high-rate, ubiquitous wireless services. For the first time, and for all of these standards, MIMO technology will play an integral role in meeting the aggressive performance requirements for increased data rates, decreased latency, and improved coverage. Motivated by the confluence of these two events'”the emergence of multiuser MIMO theory and the development of commercial MIMO-based systems'”we propose to connect the two worlds with a book that combines theory and practice. This book would provide a systematic survey of MIMO systems, starting with a review of MIMO link-level techniques and conventional single-antenna system-level techniques, summarizing the latest results in multiuser MIMO systems and developments in cross-layer techniques, and applying these techniques to the analysis and design of both current and future packet-based wireless networks. In addition to providing theoretical results, the book would serve as a reference for practicing communication engineers by providing useful descriptions of spatial channel models and system simulation methodologies for MIMO networks