Title page for ETD etd-09202006-200512


Type of Document Master's Thesis
Author Chhabra, Saurbh
Author's Email Address schhabra@vt.edu
URN etd-09202006-200512
Title An Analytical Tool for Calculating Co-Channel Interference in Satellite Links That Utilize Frequency Reuse
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Zaghloul, Amir I. Committee Chair
Brown, Gary S. Committee Member
Kilic, Ozlem Committee Member
Pratt, Timothy J. Committee Member
Keywords
  • Co-Channel Interference
  • Frequency Reuse
  • Satellite-based cellular network
  • Carrier to Interference ratio (CIR)
  • Carrier to Noise ratio (CNR)
  • Carrier to Noise plus Interference ratio (CNIR)
Date of Defense 2006-09-08
Availability unrestricted
Abstract
This thesis presents the results of the development of a user-friendly computer code (in MATLAB) that can be used to calculate co-channel interferences, both in the downlink and in the uplink of a single satellite/space-based mobile communications system, due to the reuse of frequencies in spot beams or coverage cells. The analysis and computer code can be applied to any type of satellite or platform elevated at any height above earth. The cells or beams are defined in the angular domain, as measured from the satellite or the elevated platform, and cell centers are arranged in a hexagonal lattice. The calculation is only for a given instant of time for which the system parameters are input into the program.

The results obtained in one program run are for the overall carrier to interference ratio (CIR) along with CIR for both the uplink and downlink paths. An overall carrier to noise plus interference ratio (CNIR) is also calculated, which exemplifies the degradation in the carrier to noise ratio (CNR) of the system.

Comparisons for systems with differing system scenarios are also made. For example, overall CIRs are compared for different reuse numbers (3, 4, 7, and 13) in LEO and GEO satellite systems.

In conclusion, as expected, it is observed that the co-channel interference generally increases as we decrease the reuse number employed for the frequency reuse in the cells. It is also observed that co-channel interference can cause substantial degradation to the overall CNR of a system.

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