NeTS: Small: Random Access Heterogeneous MIMO Networks

当具有不同数量天线的节点共享介质时，现有的802.11n效率低下。这项研究旨在开发一种先进的802.11n设计，以最大数量的天线提供MIMO发射机允许的尽可能多的并发传输。这样的设计提供了性能提升，同时保持了当今802.11n的完全分布式随机接入特性，即支持突发流量、分布式决策和临时部署的能力。该研究开发了一种新的载波侦听机制，使MIMO节点能够在不干扰正在进行的传输的情况下检测它们是否可以在存在传输的情况下进行传输。然后，它基于该机制来提供随机接入协议，其中MIMO节点竞争时间和自由度，而不需要任何形式的集中协调。最后，在无线测试床上实现了其设计，并对其进行了评估。通过为相同的资源提供更高的吞吐量，本研究推动了MIMO 802.11网络和相应行业的设计。

Existing 802.11n is inefficient whenever nodes with a different number of antennas share the medium. This research aims to develop an advanced 802.11n design that delivers as many concurrent transmissions as permitted by the MIMO transmitter with the maximum number of antennas. Such a design delivers performance gain while maintaining the fully distributed random access nature of today's 802.11n, i.e., its ability to support bursty traffic, distributed decisions, and ad hoc deployment. The research develops a novel carrier sense mechanism that enables MIMO nodes to detect whether they can transmit in the presence of an ongoing transmission without interfering with it. It then builds on this mechanism to deliver a random access protocol where MIMO nodes contend for both time and degrees of freedom, without any form of centralized coordination. Finally, it implements its design and evaluates it in a wireless testbed. By delivering a higher throughput for the same resource, this research advances the design of MIMO 802.11 networks and the corresponding industry.