Title page for ETD etd-05052003-171217

Type of Document Master's Thesis
Author Ballagh, Jason
Author's Email Address jaballag@vt.edu
URN etd-05052003-171217
Title Bluetooth Frequency Hop Selection Kernel Impact on “Inter-Piconet” Interference
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Sweeney, Dennis G. Committee Chair
Baumann, William T. Committee Member
Pratt, Timothy J. Committee Member
  • Synchronization
  • Hop selection kernel
  • Inter-piconet
  • Piconet
  • Bluetooth
  • Interference
Date of Defense 2003-04-29
Availability unrestricted
The Bluetooth wireless transmission standard provides a low-power data link between

electronic devices over relatively short ranges. These links, also known as piconets,

transmit using frequency hopping spread spectrum (FHSS) to send information over the

air. As more applications for Bluetooth technology become available, the number of

Bluetooth devices will continue to increase. With this increase in use, there will be a

decrease in performance that can be attributed to Bluetooth “inter-piconet” interference.

To date, very little has been published on the subject of inter-piconet interference.

Previous studies have derived mean packet error rates for an increase in the number of

piconets present. To come up with the mean rate, many papers make the assumption that

the probability of a Bluetooth device hopping to a channel is random. However, making

this assumption does not explain what happens in real time.

This research gives some insight into what really happens when multiple piconets are

interfering in real time. Bluetooth devices actually use a frequency hopping algorithm to

determine the hopping sequence. This algorithm has been implemented in software to

test various aspects of inter-piconet interference. Previous studies have shown that

synchronizing the clocks among neighboring piconets will result in an increase in

performance. This study shows that there are cases where synchronization alone will not

provide sufficient improvement. Experimental testing has been conducted to validate

some of the simulated results. Adjacent channel interference was observed during

experimentation. This contradicts previous research, which has assumed that adjacent

channel interference is insignificant.

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