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中文摘要：
研究了多用户MIMO—OFDM系统中的下行链路子载波和功率分配问题。为了在保证用户公平性和服务质量（QoS）要求的同时，实现基站发射功率最小化的目标，提出了一种新的子载波分配准则，并且根据该准则，提出了一种新的动态资源分配方案，能够充分利用多用户分集。所提出算法中采用了自适应子载波分配，自适应调制和特征波束赋形等技术。仿真结果表明，提出算法能够显著提高系统性能，从而降低所需发射功率。
英文摘要：
In this paper, the subcarrier and power allocation problems for multi-user downlink MIMO-OFDM wireless networks are investigated. With the goal of minimizing the required total transmission power and ensuring each user＇ s fairness and QoS requirements, a new subcarrier assignment criterion is proposed. Based on the assignment criterion, a novel dynamic resource allocation scheme is developed to exploit the multiuser diversity gain. The proposed algorithm involves adaptive subcarrier allocation, adaptive modulation and eigen beamforming. Numerical simulations show that the proposed algorithm can offer significant performance improvement and decrease total transmission power effectively.
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