• Login
    View Item 
    •   SMARTech Home
    • Georgia Tech Theses and Dissertations
    • Georgia Tech Theses and Dissertations
    • View Item
    •   SMARTech Home
    • Georgia Tech Theses and Dissertations
    • Georgia Tech Theses and Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Correct, Efficient, and Realistic Wireless Network Simulations

    Thumbnail
    View/Open
    subbareddy_dheeraj_r_200705_phd.pdf (1.292Mb)
    Date
    2007-01-10
    Author
    Subbareddy, Dheeraj Reddy
    Metadata
    Show full item record
    Abstract
    Simulating wireless networks accurately is a non-trivial task because of the large parameter space that affects the performance of such networks. Increasing the amount of detail in the simulation model increases these requirements by many times. Hence there is a need to develop suitable abstractions that maintain the accuracy of the simulation while keeping the computational resource requirements low. The topic of wireless network simulation models is explored in this research, concentrating on the medium access control and the physical layers. In the recent years, a large amount of research has focussed on various kinds of wireless networks to fit various application domains. Mobile Ad-Hoc Networks (MANETs), Wire- less Local Area Networks (WLANs), and Sensor Networks are a few examples.The IEEE 802.11 Physical layer(PHY) and Medium Access Control (MAC) layer are the most popular wireless technologies in practice. Consequently, most implementations use the IEEE 802.11 specifications as the basis for higher layer protocol design and analyses. In this dissertation, we explore the correctness, efficiency, and realism of wireless network simulations. We concentrate on the 802.11-based wireless network simulations, although the methods and results can also be used for various other wireless network simulations too. While many simulators model the IEEE 802.11 wireless networks, almost all of them tend to make some abstractions to lessen the computation burden and to obtain reasonable results. A comparitive study of three wireless simulators is made with respect to the correctness of their ideal behavior as well as their behavior under a high degree of load. Further, the physical-layer abstraction in wireless network simulations tends to be very simplistic because of the huge computational requirements that are needed to accurately model the various propagation, fading, and shadowing models. When mobility is taken into account several other issues like the Doppler effect should also be accounted for. This dissertation explores an empirical way to model the physical layer which cumula- tively accounts for all these effects. From a network protocol designers perspective, it is the cumulative effect of all these parameters that is of interest. Our major contribution has been the investigation of novel empirical models of the wireless physical layer, which account for node mobility and other effects in an outdoor environment. These models are relatively more realistic and efficient when implemented in a simulation environment. Our simulation experiments validate the models and pro- vide simulation results which closely match our outdoor experiments. Another significant contribution is in understanding and design of wireless network simulation models.
    URI
    http://hdl.handle.net/1853/14558
    Collections
    • Georgia Tech Theses and Dissertations [23877]
    • School of Electrical and Computer Engineering Theses and Dissertations [3381]

    Browse

    All of SMARTechCommunities & CollectionsDatesAuthorsTitlesSubjectsTypesThis CollectionDatesAuthorsTitlesSubjectsTypes

    My SMARTech

    Login

    Statistics

    View Usage StatisticsView Google Analytics Statistics
    facebook instagram twitter youtube
    • My Account
    • Contact us
    • Directory
    • Campus Map
    • Support/Give
    • Library Accessibility
      • About SMARTech
      • SMARTech Terms of Use
    Georgia Tech Library266 4th Street NW, Atlanta, GA 30332
    404.894.4500
    • Emergency Information
    • Legal and Privacy Information
    • Human Trafficking Notice
    • Accessibility
    • Accountability
    • Accreditation
    • Employment
    © 2020 Georgia Institute of Technology