rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Random Subcarrier Allocation in OFDM-Based Cognitive Radio Networks and Hyper Fading Channels
  name:
    name part: Ekin, Sabit
    role:
      role term: creator
    role:
      role term: author.
  name:
    name part: Serpedin, Erchin
    role:
      role term: thesis advisor.
  name:
    name part: Qaraqe, Khalid
    role:
      role term: thesis advisor.
  name:
    name part: Texas A & M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: txu
    date issued: 2013
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: remote
    extent: 1 online resource (134 pages)
  abstract: Advances in communications technologies entail demands for higher data rates. One of the popular solutions to fulfill this requirement was to allocate additional bandwidth, which unfortunately is not anymore viable due to spectrum scarcity. In addition, spectrum measurements around the globe have revealed the fact that the available spectrum is under-utilized. One of the most remarkable solutions to cope with the under-utilization of radio-frequency (RF) spectrum is the concept of cognitive radio (CR) with spectrum sharing features, also referred to as spectrum sharing systems. In CR systems, the main implementation issue is spectrum sensing because of the uncertainties in propagation channel, hidden primary user (PU) problem, sensing duration and security issues. Hence, the accuracy and reliability of the spectrum sensing information may inherently be suspicious and questionable. Due to the imprecise spectrum sensing information, this dissertation investigates the performance of an orthogonal frequency-division multiplexing (OFDM)-based CR spectrum sharing communication system that assumes random allocation and absence of the PU's channel occupation information, i.e., no spectrum sensing is employed to acquire information about the availability of unused subcarriers or the PU's activity. In addition, no cooperation occurs between the transmitters of the PUs and secondary users (SUs). The main benefit of random subcarrier utilization is to uniformly distribute the amount of SUs' interference among the PUs' subcarriers, which can be termed as interference spreading. The analysis and performance of such a communication set-up provides useful insights and can be utilized as a valid benchmark for performance comparison studies in CR spectrum sharing systems that assume the availability of spectrum sensing information. In the first part this dissertation, due to the lack of information about PUs' activities, the SU randomly allocates the subcarriers of the primary networ…
  note: by Sabit Ekin.
  note: "Major Subject: Electrical Engineering"
  note: Includes vita.
  note: Doctor of Philosophy Texas A & M University 2012 http://hdl.handle.net/1969.1/148142
  note: Includes bibliographical references.
  note: Text (Dissertation)
  subject:
    topic: Major Electrical Engineering
  subject:
    topic: Hyper fading channels
  subject:
    topic: Interference spreading
  subject:
    topic: Spectrum sharing systems
  subject:
    topic: OFDM-based cognitive radio
  subject:
    topic: Subcarrier collisions
  subject:
    topic: Random subcarrier allocation
  identifier: http://hdl.handle.net/1969.1/148142
  record info:
    record content source: TXA
    record creation date: 131218
    record change date: 20151206090646.0
    record identifier: in00003342530
    language of cataloging:
      language term: eng