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High system throughput and fairness among the users seem always two contradictory aspects in a multiuser system. Using multiple antennas offers the opportunity to alleviate this contradiction. This paper provides an enhanced sub-channel scheduling scheme using random beamforming. A realizable system structure is given. Random beamforming fluctuates the channels and provides more opportunity for the users in poor conditions. Sub-channel based scheduling helps to improve the efficiency of the resource assignment. We also investigate the effects of some key factors on the random beamforming system. In the evaluation of different schemes, the paper takes into account not only throughput but also fairness performance. It is shown that given limited quantities of feedback information, the proposed scheduling strategy achieves a remarkable compromise between throughput and fairness in a multiuser system.