A flexible downlink scheduling scheme in cellular packet data systems
IEEE Transactions on Wireless Communications
Opportunistic beamforming using dumb antennas
IEEE Transactions on Information Theory
On the achievable throughput of a multiantenna Gaussian broadcast channel
IEEE Transactions on Information Theory
Sum capacity of Gaussian vector broadcast channels
IEEE Transactions on Information Theory
Analysis of adaptive proportional fair scheduling method on BD-GMD scheme for MIMO systems
International Journal of Wireless and Mobile Computing
An efficient scheduling scheme based on MET for MIMO systems
International Journal of Wireless and Mobile Computing
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In MIMO systems, the multi-user diversity is exploited by always scheduling the subscribers whose channel conditions are almost in their peaks. The throughput of system is increased but the fairness is ignored, even some subscribers will be "starvation". In this paper, the fairness of the MIMO systems is concerned and two adaptive proportional fair scheduling schemes based on opportunistic beamforming are proposed to increase the throughput of the subscribers in the bad channel conditions and guarantee the fairness allover the systems. In each timeslot, the adaptive parameters are updated by monitoring the requested data rate and the mean of the requested data rate in the past period. And the adaptive parameters are updated per-user basis. The proposed schemes find a tradeoff between the throughput and the fairness. And the simulation results show the validity.