Feedback-Efficient Agile Scheduling-Beamforming for Network MIMO OFDMA Systems With Realistic Channel Models

The acquisition of channel state information is a pressing issue in the implementation of network Multi-Input Multi-Output (MIMO) systems, where the base-stations coordinate across multiple cells for inter-cell interference mitigation. This paper proposes a two-stage channel quantization and feedback mechanism named Agile Scheduling-Beamforming (ASB) for the downlink network MIMO system employing both spatial multiplexing and Orthogonal Frequency-Division Multiple-Access (OFDMA). The proposed scheme polls the users for their best set of spatial-frequency resource blocks, then schedules the users according to the fairness criterion, and finally asks the selected users to feedback finer channel quantization.

Provided by: University of Toledo Topic: Networking Date Added: Apr 2012 Format: PDF

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