Title page for ETD etd-05072003-180228


Type of Document Master's Thesis
Author Dham, Vikram
Author's Email Address vdham@vt.edu
URN etd-05072003-180228
Title Link Establishment in Ad Hoc Networks Using Smart Antennas
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
DaSilva, Luiz A. Committee Chair
Annamalai, Annamalai Jr. Committee Member
Midkiff, Scott F. Committee Member
Keywords
  • XuDSR
  • extended link
  • WLAN
  • simulation
  • directional antenna
  • DSR
Date of Defense 2003-01-15
Availability unrestricted
Abstract
Traditionally medium access control protocols for ad hoc networks have been designed for nodes using omni directional antennas. Through the use of directional antennas, it is possible to obtain higher efficiency. In this thesis we investigate the impact of these antennas on aggregate throughput and end-to-end delay. The use of omni-directional antennas not only results in lower power efficiency, but also decreases network efficiency due to interference caused by the transmission of packets in undesired directions. This thesis explores the effect of using smart antennas and proposes a signaling mechanism for forming the extended links using the network layer. For the performance assessment of the wireless networks using directional antennas, baseline models of phased array antenna and channel have been developed using the discrete event simulator OPNET ModelerTM 8.0. Simulation scenarios have been created for single hop as well as multihop networks. From the results of the simulation we observe that although the nodes forming the extended link experience decrease in end-to-end delay, the data successfully transmitted using extended link is correlated to the spatial distribution of nodes.
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