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中文摘要：
本文针对超高吞吐量无线局域网（VHT WLAN）引入多用户和带宽扩展后造成的载波侦听机制呈现的一些问题,提出了基于媒体接入控制层（MAC,Medium Access Control）协作的两层网络分配矢量（TLNAV,Two Level Network Allocation Vector）方案,该方案不仅有效解决了传统机制存在的问题而且在实际应用中简单易行,并能获得系统吞吐量的有效提升;在此基础上,本文提出了超高吞吐量无线局域网的不等带宽发送方案,该方案不仅解决了多用户模式发送时带宽的浪费问题,而且获得了系统吞吐量的进一步提高;本文对所提方案进行了性能分析,获得了所提方案在单用户和多用户发送模式下的吞吐量增益;最后本文通过仿真验证了所提方案的有效性以及理论分析的正确性,从仿真结果可以看到随着传输机会内剩余时长的增加所提方案能获得显著的吞吐量性能增益.
英文摘要：
This paper proposes the two level network allocation vector scheme aiming to solve the problems caused by the employment of MU-MIMO and bandwidth expansion,the scheme proposed can not only solve the problems efficiently in conventional mechanism but also be simple and easy to implement,and can boost the system throughput significantly; on that basis,the paper proposes unequal bandwidth transmission scheme,which can not only solve the problem of bandwidth waste under multiple users mode but also further improve the system throughput.This paper analyzes the schemes proposed and obtains the throughput gains of single user mode and multiple-user mode.Finally,simulations are provided to verify the effectiveness of scheme proposed and the correctness of analytical results,from which to see that the scheme proposed can obtain throughput gains dramatically with the redundant time length in TXOP increasing.
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