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中文摘要：
在IEEE 802.11ac Draft 2.0标准草案的基础上,针对其新引入的多用户MIMO传输机制进行了深入研究,提出了几点改进的优化设计方案,并完成了相应的性能分析。最后对IEEE 802.11ac的多用户MIMO传输方案进行了系统的性能分析,仿真结果表明,改进的传输方案在误比特率（BER）和吞吐量方面获得了明显的性能增益,且与针对性能的理论分析与仿真结果相吻合。
英文摘要：
The recent IEEE 802.11ac adopted a novel multi-user access technique, which was the downlink multi-user MIMO （MU-MIMO） transmission. This was very different from the former IEEE 802.11 standard＇s protocols. The MU-MIMO transmission technique in IEEE 802.1 ! ac draft was studied and proposed some optimal designs. Finally, the performance of the IEEE 802.11ac MU-MIMO transmission schemes and gives the simulations. The simulation results show that the proposal transmission schemes can achieve gains of BER and throughput in theory and simulations.
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