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Gaussian Process for Propagation modeling and Proximity Reports Based Indoor Positioning
Ericsson Research, Linköping, Sweden.
Ericsson Research, Linköping, Sweden.
Ericsson Research, Linköping, Sweden.
Ericsson Research, Linköping, Sweden.
Visa övriga samt affilieringar
2016 (Engelska)Ingår i: 2016 IEEE 83rd Vehicular Technology Conference (VTC Spring), IEEE , 2016, s. 1-5Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

The commercial interest in proximity services is increasing. Application examples include location-based information and advertisements, logistics, social networking, file sharing, etc. In this paper, we consider network-based positioning based on times series of proximity reports from a mobile device, either only a proximity indicator, or a vector of RSS from observed nodes. Such positioning corresponds to a latent and nonlinear observation model. To address these problems, we combine two powerful tools, namely particle filtering and Gaussian process regression (GPR) for radio signal propagation modeling. The latter also provides some insights into the spatial correlation of the radio propagation in the considered area. Radio propagation modeling and positioning performance are evaluated in a typical office area with Bluetooth-Low-Energy (BLE) beacons deployed for proximity detection and reports. Results show that the positioning accuracy can be improved by using GPR.

Ort, förlag, år, upplaga, sidor
IEEE , 2016. s. 1-5
Nationell ämneskategori
Kommunikationssystem
Identifikatorer
URN: urn:nbn:se:liu:diva-128255DOI: 10.1109/VTCSpring.2016.7504255ISI: 000386528400206ISBN: 9781509016983 (tryckt)OAI: oai:DiVA.org:liu-128255DiVA, id: diva2:930410
Konferens
2016 IEEE 83rd Vehicular Technology Conference: VTC2016-Spring, 15–18 May 2016, Nanjing, China
Tillgänglig från: 2016-05-24 Skapad: 2016-05-24 Senast uppdaterad: 2019-02-12Bibliografiskt granskad
Ingår i avhandling
1. Position Estimation in Uncertain Radio Environments and Trajectory Learning
Öppna denna publikation i ny flik eller fönster >>Position Estimation in Uncertain Radio Environments and Trajectory Learning
2017 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

To infer the hidden states from the noisy observations and make predictions based on a set of input states and output observations are two challenging problems in many research areas. Examples of applications many include position estimation from various measurable radio signals in indoor environments, self-navigation for autonomous cars, modeling and predicting of the traffic flows, and flow pattern analysis for crowds of people. In this thesis, we mainly use the Bayesian inference framework for position estimation in an indoor environment, where the radio propagation is uncertain. In Bayesian inference framework, it is usually hard to get analytical solutions. In such cases, we resort to Monte Carlo methods to solve the problem numerically. In addition, we apply Bayesian nonparametric modeling for trajectory learning in sport analytics.

The main contribution of this thesis is to propose sequential Monte Carlo methods, namely particle filtering and smoothing, for a novel indoor positioning framework based on proximity reports. The experiment results have been further compared with theoretical bounds derived for this proximity based positioning system. To improve the performance, Bayesian non-parametric modeling, namely Gaussian process, has been applied to better indicate the radio propagation conditions. Then, the position estimates obtained sequentially using filtering and smoothing are further compared with a static solution, which is known as fingerprinting.

Moreover, we propose a trajectory learning framework for flow estimation in sport analytics based on Gaussian processes. To mitigate the computation deficiency of Gaussian process, a grid-based on-line algorithm has been adopted for real-time applications. The resulting trajectory modeling for individual athlete can be used for many purposes, such as performance prediction and analysis, health condition monitoring, etc. Furthermore, we aim at modeling the flow of groups of athletes, which could be potentially used for flow pattern recognition, strategy planning, etc.

Ort, förlag, år, upplaga, sidor
Linköping: Linköping University Electronic Press, 2017. s. 45
Serie
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1772
Nationell ämneskategori
Reglerteknik Signalbehandling Sannolikhetsteori och statistik Datorseende och robotik (autonoma system) Beräkningsmatematik
Identifikatorer
urn:nbn:se:liu:diva-135425 (URN)10.3384/lic.diva-135425 (DOI)9789176855591 (ISBN)
Presentation
2017-03-29, Visionen, Hus B, Campus Valla, Linköping, 10:15 (Engelska)
Opponent
Handledare
Tillgänglig från: 2017-03-14 Skapad: 2017-03-14 Senast uppdaterad: 2019-10-28Bibliografiskt granskad
2. Gaussian Processes for Positioning Using Radio Signal Strength Measurements
Öppna denna publikation i ny flik eller fönster >>Gaussian Processes for Positioning Using Radio Signal Strength Measurements
2019 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Estimation of unknown parameters is considered as one of the major research areas in statistical signal processing. In the most recent decades, approaches in estimation theory have become more and more attractive in practical applications. Examples of such applications may include, but are not limited to, positioning using various measurable radio signals in indoor environments, self-navigation for autonomous cars, image processing, radar tracking and so on. One issue that is usually encountered when solving an estimation problem is to identify a good system model, which may have great impacts on the estimation performance. In this thesis, we are interested in studying estimation problems particularly in inferring the unknown positions from noisy radio signal measurements. In addition, the modeling of the system is studied by investigating the relationship between positions and radio signal strength measurements.

One of the main contributions of this thesis is to propose a novel indoor positioning framework based on proximity measurements, which are obtained by quantizing the received signal strength measurements. Sequential Monte Carlo methods, to be more specific particle filter and smoother, are utilized for estimating unknown positions from proximity measurements. The Cramér-Rao bounds for proximity-based positioning are further derived as a benchmark for the positioning accuracy in this framework.

Secondly, to improve the estimation performance, Bayesian non-parametric modeling, namely Gaussian processes, have been adopted to provide more accurate and flexible models for both dynamic motions and radio signal strength measurements. Then, the Cramér-Rao bounds for Gaussian process based system models are derived and evaluated in an indoor positioning scenario.

In addition, we estimate the positions of stationary devices by comparing the individual signal strength measurements with a pre-constructed fingerprinting database. The positioning accuracy is further compared to the case where a moving device is positioned using a time series of radio signal strength measurements.

Moreover, Gaussian processes have been applied to sports analytics, where trajectory modeling for athletes is studied. The proposed framework can be further utilized to carry out, for instance, performance prediction and analysis, health condition monitoring, etc. Finally, a grey-box modeling is proposed to analyze the forces, particularly in cross-country skiing races, by combining a deterministic kinetic model with Gaussian process.

Ort, förlag, år, upplaga, sidor
Linköping: Linköping University Electronic Press, 2019. s. 51
Serie
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1968
Nyckelord
Gaussian process, positioning, radio signals
Nationell ämneskategori
Signalbehandling
Identifikatorer
urn:nbn:se:liu:diva-153944 (URN)10.3384/diss.diva-153944 (DOI)978-91-7685-162-3 (ISBN)
Disputation
2019-03-15, Ada Lovelace, Campus Valla, Linköping, 10:15 (Engelska)
Opponent
Handledare
Forskningsfinansiär
ELLIIT - The Linköping‐Lund Initiative on IT and Mobile Communications
Tillgänglig från: 2019-02-27 Skapad: 2019-02-12 Senast uppdaterad: 2019-02-27Bibliografiskt granskad

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