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The smart wireless LAN system: Adapting SDMA for wireless LANs.

机译：智能无线局域网系统：使SDMA适用于无线局域网。

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摘要

The use of wireless local-area-network (LAN) systems has been increasing rapidly as prices have come down and a common standard has emerged, the IEEE 802.11 wireless LAN standard. However, the 802.11 protocol has many critical limitations that limit its flexibility and usefulness. Because the bandwidth allocated in the standard is limited and only one user is allowed to transmit at a time, the throughput for each user is limited and users can experience long delays. In addition, the protocol was designed to accommodate only conventional data traffic and no provisions were made for multimedia or real-time applications. Not only is the throughput too low for applications such as voice, but the protocol does not include the priority designations that are required for real-time applications.; To alleviate these limitations, this dissertation presents the Smart Wireless LAN (SWL) system, which achieves throughput multiplication by exploiting the rich spatial diversity existing among spatially separated terminals. Spatial diversity is demonstrated by the amplitude and phase pattern of the data vectors received by an antenna array. Each transmitter location has a unique pattern, also called a spatial signature. Once the spatial signatures are acquired, different co-channel signals can be separated through beamforming based on their unique spatial signatures. Therefore, we can increase the number of "virtual" time slots by enabling multiple terminals to transmit in the same time slots without significantly interfering with each other. In addition to the throughput increase, this new protocol has additional features such as simple implementation, adaptability to multimedia traffic with diverse bandwidth requests, network security, guaranteed fairness in bandwidth sharing, and ease of adaptation to the 802.11 standard. Also, this protocol adds priority level designations to follow for delay-sensitive communication links for multimedia applications such as voice. Dynamic slot assignment algorithms and chip timing synchronization algorithms were created to satisfy the special requirements of adapting the space-division-multiple-access (SDMA) technique for wireless LANs. This dissertation will present a combination of throughput performance evaluation, computer simulations, and RF experimental studies to demonstrate the feasibility and benefits of the SWL system.
机译：随着价格的下降和通用标准（IEEE 802.11无线LAN标准）的出现，无线局域网（LAN）系统的使用迅速增加。但是，802.11协议具有许多关键限制，从而限制了其灵活性和实用性。因为在标准中分配的带宽是有限的，并且一次只允许一个用户进行传输，所以每个用户的吞吐量是有限的，并且用户可能会经历长时间的延迟。此外，该协议旨在仅容纳常规数据流量，而没有为多媒体或实时应用程序做任何准备。不仅对于诸如语音的应用而言吞吐量太低，而且该协议不包括实时应用所需的优先级指定。为了减轻这些限制，本文提出了一种智能无线局域网（SWL）系统，该系统通过利用空间上分离的终端之间存在的丰富空间分集来实现吞吐量的倍增。通过天线阵列接收到的数据向量的幅度和相位模式来证明空间分集。每个发射器位置都有一个唯一的模式，也称为空间特征。一旦获取了空间特征，就可以基于它们的独特空间特征，通过波束成形来分离不同的同信道信号。因此，我们可以通过使多个终端在相同的时隙中传输而不会彼此显着干扰，来增加“虚拟”时隙的数量。除了增加吞吐量之外，该新协议还具有其他功能，例如，实现简单，对具有各种带宽请求的多媒体流量的适应性，网络安全性，保证的带宽共享公平性以及易于适应802.11标准。同样，该协议添加了优先级指定，以遵循诸如语音之类的多媒体应用的对延迟敏感的通信链路。创建了动态时隙分配算法和芯片定时同步算法，以满足将空分多址（SDMA）技术用于无线LAN的特殊要求。本文将结合吞吐量性能评估，计算机仿真和射频实验研究来证明SWL系统的可行性和优势。

著录项

  • 作者

    Okamoto, Garret Toshio.;

  • 作者单位

    The University of Texas at Austin.;

  • 授予单位 The University of Texas at Austin.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 1998
  • 页码 108 p.
  • 总页数 108
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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