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Orthogonal Frequency Division Multiple Access (OFDMA) transmission has been chosen for the next generation of wireless networks. Multiple Input Multiple Output (MIMO) techniques are well suited for OFDMA and will be used for increased transmission efficiency for both downlink and uplink. In this paper the authors focus on Space Division Multiple Access (SDMA) techniques for the uplink of such a network. In particular, they consider the problem of scheduling uplink users so as to maximize the uplink resources while satisfying the QoS requirements of each user's flows. The authors do this by assigning suitable utility functions to user flows that are designed to maintain the specified QoS constraints.
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