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中文摘要：
以系统总速率最大化为目标，基于迫零污纸编码（ZF-DPC）机制提出了MIMO多用户下行系统的一种保障用户QoS的自适应调制方案。根据这一方案，基站应用空分多址接入（SDMA）同时支持多个用户；针对污纸编码（DPC）的极高复杂度，利用次优的ZF-DPC消除用户间的干扰；在理想信道信息情形下实现可变速率可变功率自适应调制。考虑到最优算法的高复杂度，提出了两种可应用到实际系统的低复杂度次优算法。仿真结果表明，次优算法在极大降低系统复杂度的同时，总速率比较接近最优算法的性能。
英文摘要：
Based on the zero-forcing dirty-paper coding （ZF-DPC） mechanism, this study presented an adaptive modulation scheme for downlink multi-user MIMO systems to maximize systems＇ sum-rate and achieve a guaranteed QoS for users. Specifically, according to the scheme, the basestation exploits spatial division multiple access （SDMA） to support several users＇ simultaneous transmission, and the suboptimal ZF-DPC to reduce inferences among users because of the high complexities of dirty-paper coding （DPC）. Then an adaptive modulation scheme with variable rate and variable power was achieved under perfect channel state information at the basestation. Because the brute-force search is eomputationally prohibitive, two low-complexity suboptimal algorithms which could be used in practical systems were proposed. Simulation results showed that the suboptimal algorithms achieved almost the same performance as the optimal one at the same time the system complexity was greatly reduced.
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