Bluetooth channel sounding
Kieksi, Osmo (2025)
2025
Sähkötekniikan DI-ohjelma - Master's Programme in Electrical Engineering
Informaatioteknologian ja viestinnän tiedekunta - Faculty of Information Technology and Communication Sciences
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Hyväksymispäivämäärä
2025-11-25
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tuni-2025112510873
https://urn.fi/URN:NBN:fi:tuni-2025112510873
Tiivistelmä
The goal of this thesis was to investigate the accuracy of Bluetooth channel sounding and to evaluate suitability for the accurate localization scheme. Bluetooth channel sounding defines two distance ranging methods, round trip time (RTT) and phase based ranging (PBR) under the Bluetooth 6.0 core.
In this study a Bluetooth channel sounding system that utilizes phase based ranging was implemented and tested. This included both hardware and software implementation. The hardware part consists of the theory behind the required hardware and the justification for their selection. It also looks at the most significant hardware errors and how they can be compensated. The software part instead includes introduction of the Bluetooth protocol and especially features relevant to channel sounding. It also contains the theory behind two algorithms that were used in phase unwrapping. Finally, these parts are combined to make up the functional system.
The system was also tested in a real environment to get a picture of its actual performance. This consists of three different test scenarios under various conditions. The results were then analyzed with appropriate statistical methods. Good accuracy was achieved under optimal conditions, but as expected, the system is not reliable in challenging environments. Finally, some alternative methods are briefly introduced and ideas for further evaluation are shown.
In this study a Bluetooth channel sounding system that utilizes phase based ranging was implemented and tested. This included both hardware and software implementation. The hardware part consists of the theory behind the required hardware and the justification for their selection. It also looks at the most significant hardware errors and how they can be compensated. The software part instead includes introduction of the Bluetooth protocol and especially features relevant to channel sounding. It also contains the theory behind two algorithms that were used in phase unwrapping. Finally, these parts are combined to make up the functional system.
The system was also tested in a real environment to get a picture of its actual performance. This consists of three different test scenarios under various conditions. The results were then analyzed with appropriate statistical methods. Good accuracy was achieved under optimal conditions, but as expected, the system is not reliable in challenging environments. Finally, some alternative methods are briefly introduced and ideas for further evaluation are shown.