Title page for ETD etd-11282007-114731


Type of Document Master's Thesis
Author Zarookian, Ruffy
Author's Email Address rzarooki@vt.edu
URN etd-11282007-114731
Title Feasibility of Spectrum Sharing Between Airborne Weather Radar and Wireless Local Area Networks
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Pratt, Timothy J. Committee Chair
Buehrer, Richard Michael Committee Member
Jacobs, Ira Committee Member
Keywords
  • Airborne Weather Radar
  • Interference
  • Radar
  • Spectrum Sharing
  • Wireless Local Area Networks
  • X Band
  • SHF Band
  • Wireless Communications
Date of Defense 2007-11-14
Availability unrestricted
Abstract
Emerging technologies such as wireless local area networks and cellular telephones have dramatically increased the use of wireless communications services within the last 10 years. The shortage of available spectrum exists due to increasing demand for wireless services and current spectrum allocation regulations. To alleviate this shortage, Research aims to improve spectral efficiency and to allow spectrum sharing between separatelymanaged and non-coordinating communications systems.



This thesis explores the feasibility of spectrum sharing between airborne weather radar and wireless local area networks at 9.3 GHz – 9.5 GHz. Characteristics of flight paths of aircraft using airborne weather radar and the low duty cycle of radar transmissions offer unique opportunities for spectrum sharing. But it was found that the extremely sensitive receivers provide challenges for designing a communications system meant for widespread use. The probability of causing harmful interference to airborne weather radar is too great for most types of wireless local area networks, but a direct sequence spread spectrum scheme could share spectrum with airborne weather radar. Bit errors in wireless local area network links caused by airborne weather radar interference do not significantly decrease the performance of the wireless local area network system. The distribution of interference outside of the airborne weather radar receiver by using direct sequence spread spectrum combined with the acceptable bit error rates indicate that while spectrum sharing between airborne weather radar and wireless local area network at 9.3 GHz – 9.5 GHz is not feasible, direct sequence spread spectrum systems can share spectrum with airborne weather radars under more limited assumptions.

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