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Multiple Input Multiple Output (MIMO) communication has been the focus of a lot of research which basically demonstrated that the capacity of a point to point MIMO link increases linearly with the number of transmit and receive antennas. Research focus has shifted recently to the role of multiple antennas in multiuser systems, especially broadcast scenarios (i.e., one too many communication) as downlink scheduling is the major bottleneck for future broad band wireless networks. When multiple users are present, one is usually interested in quantifying the maximum possible sum rate to all users and devising computationally efficient algorithms for capturing most of this rate.
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