Signals of Opportunity for Positioning Purposes
|Kustantaja||Tampere University of Technology|
|Tila||Julkaistu - 4 joulukuuta 2018|
|Nimi||Tampere University of Technology. Publication|
While LBS are driving the need to continuously locate the user at higher degrees of accuracy and across any environment, be it in a city park, an urban canyon or inside a corporate oﬃce, some of these environments pose a challenge for GNSS. Indoor environments are particularly challenging for GNSS due to the attenuation and strong multipath imposed by walls and building materials. Such challenges and diﬃculties in signal acquisition have led to the development of solutions and technologies to improve positioning in indoor environments.
While there are several commercial systems available to fulﬁll the needs of most LBS in indoor environments, most of these are not feasible to deploy at a global scale due to their infrastructure costs. Hence, several solutions have sought to build upon existing infrastructure to provide positioning information.
Building upon existing infrastructure is what leads to the main topic of this thesis, the concept of signals of opportunity (SoO). A SoO is any wireless signal that can be exploited for a positioning purpose despite its initial design seeking to fulﬁll a diﬀerent purpose. A few examples of these signals are IEEE 802.11 signals, commonly known as WiFi, Bluetooth, digital video broadcasting - terrestrial (DVB-T) and many of the cellular signals, such as long-term evolution (LTE), universal mobile telecommunications system (UMTS) and global mobile system (GSM).
The goal of this thesis is to address various challenges related to SoO for positioning. From the identiﬁcation of SoO at the physical layer, how to merge them at the algorithmic level and how to put them in use for a cognitive positioning system (CPS).