Type of Document Master's Thesis Author Ballagh, Jason Author's Email Address firstname.lastname@example.org 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 Keywords
- Hop selection kernel
Date of Defense 2003-04-29 Availability unrestricted AbstractThe 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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