A Low Complexity Greedy Scheduler for Multiuser MIMO Downlink

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It is widely believed that the implementation of Multi-User Multiple Input Multiple Output (MU-MIMO) technology at the radio access portion of current and future wireless networks would positively impact on the performance of such networks especially in terms of system capacity. This however, demands, the design of efficient multi-user scheduling algorithms at the data link layer. In the case of packet data which is delay tolerant, there is more flexibility in the design of such multiuser scheduling algorithms. One such algorithm that is known to be throughput optimal is the greedy scheduler. For the downlink of a Single Input Single Output (SISO) system, the greedy scheduler serves the user whose channel maximizes the channel capacity at each transmission opportunity.