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A directional MAC protocol for MANET.

机译：MANET的定向MAC协议。

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摘要

In a typical mobile ad hoc network (MANET), all nodes contend for a single channel access using carrier sense multiple access with collision avoidance (CSMA/CA). Thus, a fundamental limitation of MANET is that, as the number of nodes increases, the performance of the system will dramatically degrade due to the large number of collisions. This, in turn, results in an overall low system throughput.;Solving these problems is at the core of designing any DMAC protocol. At the same time, DMC protocols should not sacrifice channel bandwidth to deal with theses problems.;In this thesis, we propose an efficient 2-channel 2-mode DMAC protocol. In particular, our protocol employs two frequency division multiplexed channels: Channel one is used for omni mode packets transmission and channel two is used for directional mode packets transmission. Estimation of Signal Parameter via Rotational Invariance Technique (ESPRIT) is used for direction of arrival (DOA) estimation. By avoiding the reliance on GPS for obtaining the position information, our protocol is also suitable for indoor environments.;Under different operating conditions and channel models, our simulation results clearly show the improved throughput of our protocol compared to IEEE 802.11.;Several researchers have focused on the potential throughput gains achieved using directional antennas in ad hoc networks. When compared to omnidirectional antennas, directional antennas are more attractive option in terms of power and bandwidth efficiency. On the other hand, when used in ad hoc networks, directional MAC (DMAC) protocols usually require all nodes, or part of nodes, to be aware of their exact locations. The location information is typically provided to the DMAC protocol from upper network layers, for example, by using a Global Positioning System (GPS). Other problems that face these DMAC protocols are the deafness problem and the hidden terminal problem.
机译：在典型的移动自组织网络（MANET）中，所有节点都使用带有冲突避免功能的载波侦听多路访问（CSMA / CA）争夺单通道访问。因此，MANET的基本局限性在于，随着节点数量的增加，由于大量的冲突，系统的性能将急剧下降。反过来，这将导致总体系统吞吐量较低。解决这些问题是设计任何DMAC协议的核心。同时，DMC协议不应该牺牲信道带宽来解决这些问题。本文提出了一种有效的2信道2模式DMAC协议。特别地，我们的协议采用两个频分复用信道：信道1用于全向模式数据包传输，信道2用于定向模式数据包传输。通过旋转不变技术（ESPRIT）估计信号参数用于到达方向（DOA）估计。通过避免依赖GPS来获取位置信息，我们的协议也适用于室内环境。在不同的工作条件和信道模型下，我们的仿真结果清楚地表明，与IEEE 802.11相比，我们的协议的吞吐量有所提高。重点介绍了在ad hoc网络中使用定向天线获得的潜在吞吐量。与全向天线相比，定向天线在功率和带宽效率方面更具吸引力。另一方面，在专用网络中使用时，定向MAC（DMAC）协议通常要求所有节点或部分节点知道其确切位置。位置信息通常例如通过使用全球定位系统（GPS）从高层网络层提供给DMAC协议。这些DMAC协议面临的其他问题是耳聋问题和隐藏终端问题。

著录项

  • 作者

    Liu, Kun.;

  • 作者单位

    Concordia University (Canada).;

  • 授予单位 Concordia University (Canada).;
  • 学科 Engineering Electronics and Electrical.
  • 学位 M.A.Sc.
  • 年度 2007
  • 页码 88 p.
  • 总页数 88
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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