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Modelling and Evaluation of a Bluetooth Data Logger in the Presence of Interference Sources
KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT. (CCSlab)
2005 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Industrial Development Centre (IUC) in Olofström inc. has constructed a measurement value logger which can sample values from eight channels, buffer them and then send them wireless with the Bluetooth technology to e.g. a computer.</p> In this thesis the data transfer rate, i.e. the number of values per second has been studied for different logger settings and when there are interferences in the Bluetooth traffic. How Bluetooth is affected by interferences has been studied with a number of experiments performed at IUC's RF-damped Faraday's cage.

The thesis provides a model for this Bluetooth logger. The model extends the existing simulation system NS2-UCBT with a 'logger protocol'. NS2-UCBT was also extended to better support modeling of losses (due to Bluetooth channel impairments) and for the model of these losses to be based on experiments. The resulting simulation program allows developers to construct and evaluate a measurement system utilizing such a Bluetooth logger. Using the simulation model, the data rate measured in samples per second was examined for the logger. The simulations shows that optimizing the logger's configuration will improve that data rate considerable.

This report contains: a summary of the problem and earlier research, an explanation of the simulation system and the simulation program, comparisons between simulations and experiments, some conclusions, and proposes future work in this area.

Abstract [sv]

Industriellt Utvecklings Centrum (IUC) i Olofström AB har tagit fram en mätvärdeslogger som kan sampla värden från åtta kanaler, mellanlagra dem och skicka dem till exv. en dator trådlöst med Bluetooth teknologin.

I det här examensarbetet har överföringshastigheten, dvs antal mätvärden per sekund studerats för olika inställningar på loggern och då det förekommer störningar i Bluetooth trafiken. Hur Bluetooth påverkas av störningar har undersökts genom en rad experiment i IUC's RF-dämpade skärmlabb.

Arbetet har lett fram till en modell för mätvärdesloggern och ett simuleringsprogram som gör det möjligt för utvecklare att konstruera och utvärdera sina mätsystem med mätvärdes logger. Modellen använder det befintliga NS2-UCBT simuleringssystemet utvidgat med ett 'logger protokoll', mer utvecklad förlusthantering än NS2-UCBT i grundutförandet erbjuder och flexibel förlusthantering baserad på experiment.

Med simuleringsmodellen undersöktes loggerns datahastighet i sampel per sekund. Simuleringarna visa att genom att förbättra loggerns konfiguration kan avsevärt högre datahastighet nås.

Den här rapporten innehåller: en sammanfattning av problemställningen och tidigare forskning, en beskrivning av simulationssystemet och simulationsprogrammet, jämförelser mellan simuleringar och experiment, en del slutsatser, och förslag på framtida arbete i området.

Place, publisher, year, edition, pages
2005. , 104 p.
Series
TRITA-IMIT-LCN. AVH, ISSN 1651-4106 ; 2005-08
Keyword [en]
Bluetooth, simulations, NS2-UCBT, logger, buffer and interferences
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:kth:diva-92292OAI: oai:DiVA.org:kth-92292DiVA: diva2:513170
Subject / course
Teleinformatics
Educational program
Master of Science in Engineering - Computer Science and Technology
Presentation
2005-04-07, Seminar room Grimeton, Isafjordsgatan 30B, Kista, 11:00 (English)
Uppsok
Technology
Supervisors
Examiners
Available from: 2012-04-02 Created: 2012-03-30 Last updated: 2017-02-06Bibliographically approved

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CiteExportLink to record
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