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Multi-user MIMO
Multi-user MIMO (MU-MIMO) is a set of multiple-input and multiple-output technologies for wireless communication, in which a set of users or wireless terminals, each with one or more antennas, communicate with each other. In contrast, single-user MIMO considers a single multi-antenna transmitter communicating with a single multi-antenna receiver. MU-MIMO has at times been referred to as space-division multiple access (SDMA); users that are transmitting at the same time and frequency may be separated using their different spatial signatures. In a similar way that OFDMA adds multiple access (multi-user) capabilities to OFDM, MU-MIMO adds multiple access (multi-user) capabilities to MIMO. MU-MIMO was considered right from the beginning of research on multi-antenna communication, including work by Telatar on the capacity of the MU-MIMO uplink.
SDMA,〔N. Jindal, (MIMO Broadcast Channels with Finite Rate Feedback ), IEEE Transactions on Information Theory, vol. 52, no. 11, pp. 5045–5059, 2006.〕〔D. Gesbert, M. Kountouris, R.W. Heath Jr., C.-B. Chae, and T. Sälzer, (Shifting the MIMO Paradigm ), IEEE Signal Processing Magazine, vol. 24, no. 5, pp. 36-46, 2007.〕 massive MIMO,〔T. L. Marzetta, (Noncooperative Cellular Wireless with Unlimited Numbers of Base Station Antennas ) IEEE Transactions on Wireless Communications, vol. 9, no. 11, pp. 56-61, 3590-3600, Nov. 2010.〕〔J. Hoydis, S. ten Brink, M. Debbah, (Massive MIMO in the UL/DL of Cellular Networks: How Many Antennas Do We Need? ) IEEE Journal on Selected Areas in Communications, vol. 31, no. 2, pp. 160-171, Feb. 2013.〕 coordinated multipoint (CoMP)〔E. Björnson and E. Jorswieck, (Optimal Resource Allocation in Coordinated Multi-Cell Systems ), Foundations and Trends in Communications and Information Theory, vol. 9, no. 2-3, pp. 113-381, 2013.〕 and ad hoc MIMO are all related to MU-MIMO; each of those technologies often leverage spatial degrees of freedom to separate users.
==Technology==
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