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A distributed, mobile positioning systemfor wireless, handheld devices
KTH, Superseded Departments, Teleinformatics. (CCSlab)
2000 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This thesis investigates the possibilities of implementing a location awareness mechanism for the so-called lesswire localNavigator. The author claims that it is possible to implement such a mechanism within the given prerequisites and constraints, even though with today’s technology it may not be economically feasible.

Due to the lesswire’s constraints: high accuracy (67%), high-resolution (12 m2) and no hardware modification allowed to the mobile device, the suggested scheme uses Time Difference Of Arrival technology (TDOA). The main advantage of TDOA, as stated in this thesis, is the fact that it is almost totally independent of the preferred wireless technology of the mobile device. TDOA technology therefore, can be applied to a wide range of wireless networks (primarily TDMA, CDMA, FDMA – based). A disadvantage of this scheme is the fact that the network infrastructure needs to be extremely well synchronized - which in turn implies higher costs.

Depending on how the synchronization problem is solved, the proposed system may well be economically feasible in the near future.

Place, publisher, year, edition, pages
2000. , 97 p.
Keyword [en]
Location awareness, positioning, mobile devices, wireless, handheld, fares, Bluetooth, time difference of arrival, TDOA, synchronization, timing, network, picocell
National Category
Communication Systems
URN: urn:nbn:se:kth:diva-93545OAI: diva2:516932
Educational program
Master of Science in Engineering - Computer Science and Technology
2000-06-27, Seminar room "Telegrafen", Isafjordsgatan 22, Kista, 14:00 (English)
Available from: 2012-06-20 Created: 2012-04-20 Last updated: 2013-09-09Bibliographically approved

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