[{"language":[{"iso":"eng"}],"keyword":["Gaussian processes","Global Positioning System","convergence","expectation-maximisation algorithm","fingerprint identification","indoor radio","signal classification","wireless LAN","EM algorithm","ML estimation","WiFi indoor positioning","censored Gaussian data classification","clipped data","convergence properties","expectation maximization algorithm","fingerprinting method","maximum likelihood estimation","optimal classification","parameters estimation","portable devices sensitivity","signal strength measurements","wireless LAN positioning systems","Convergence","IEEE 802.11 Standards","Maximum likelihood estimation","Parameter estimation","Position measurement","Training","Indoor positioning","censored data","expectation maximization","signal strength","wireless LAN"],"department":[{"_id":"54"}],"user_id":"44006","_id":"11816","status":"public","abstract":[{"text":"In this paper, we consider the Maximum Likelihood (ML) estimation of the parameters of a GAUSSIAN in the presence of censored, i.e., clipped data. We show that the resulting Expectation Maximization (EM) algorithm delivers virtually biasfree and efficient estimates, and we discuss its convergence properties. We also discuss optimal classification in the presence of censored data. Censored data are frequently encountered in wireless LAN positioning systems based on the fingerprinting method employing signal strength measurements, due to the limited sensitivity of the portable devices. Experiments both on simulated and real-world data demonstrate the effectiveness of the proposed algorithms.","lang":"eng"}],"publication":"38th International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2013)","type":"conference","doi":"10.1109/ICASSP.2013.6638353","main_file_link":[{"url":"https://groups.uni-paderborn.de/nt/pubs/2013/HoHa2013.pdf","open_access":"1"}],"title":"Parameter estimation and classification of censored Gaussian data with application to WiFi indoor positioning","date_created":"2019-07-12T05:28:48Z","author":[{"last_name":"Hoang","full_name":"Hoang, Manh Kha","first_name":"Manh Kha"},{"first_name":"Reinhold","full_name":"Haeb-Umbach, Reinhold","id":"242","last_name":"Haeb-Umbach"}],"oa":"1","date_updated":"2022-01-06T06:51:09Z","page":"3721-3725","citation":{"ama":"Hoang MK, Haeb-Umbach R. Parameter estimation and classification of censored Gaussian data with application to WiFi indoor positioning. In: <i>38th International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2013)</i>. ; 2013:3721-3725. doi:<a href=\"https://doi.org/10.1109/ICASSP.2013.6638353\">10.1109/ICASSP.2013.6638353</a>","chicago":"Hoang, Manh Kha, and Reinhold Haeb-Umbach. “Parameter Estimation and Classification of Censored Gaussian Data with Application to WiFi Indoor Positioning.” In <i>38th International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2013)</i>, 3721–25, 2013. <a href=\"https://doi.org/10.1109/ICASSP.2013.6638353\">https://doi.org/10.1109/ICASSP.2013.6638353</a>.","ieee":"M. K. Hoang and R. Haeb-Umbach, “Parameter estimation and classification of censored Gaussian data with application to WiFi indoor positioning,” in <i>38th International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2013)</i>, 2013, pp. 3721–3725.","apa":"Hoang, M. K., &#38; Haeb-Umbach, R. (2013). Parameter estimation and classification of censored Gaussian data with application to WiFi indoor positioning. In <i>38th International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2013)</i> (pp. 3721–3725). <a href=\"https://doi.org/10.1109/ICASSP.2013.6638353\">https://doi.org/10.1109/ICASSP.2013.6638353</a>","short":"M.K. Hoang, R. Haeb-Umbach, in: 38th International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2013), 2013, pp. 3721–3725.","bibtex":"@inproceedings{Hoang_Haeb-Umbach_2013, title={Parameter estimation and classification of censored Gaussian data with application to WiFi indoor positioning}, DOI={<a href=\"https://doi.org/10.1109/ICASSP.2013.6638353\">10.1109/ICASSP.2013.6638353</a>}, booktitle={38th International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2013)}, author={Hoang, Manh Kha and Haeb-Umbach, Reinhold}, year={2013}, pages={3721–3725} }","mla":"Hoang, Manh Kha, and Reinhold Haeb-Umbach. “Parameter Estimation and Classification of Censored Gaussian Data with Application to WiFi Indoor Positioning.” <i>38th International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2013)</i>, 2013, pp. 3721–25, doi:<a href=\"https://doi.org/10.1109/ICASSP.2013.6638353\">10.1109/ICASSP.2013.6638353</a>."},"year":"2013","related_material":{"link":[{"url":"https://groups.uni-paderborn.de/nt/pubs/2013/HoHa2013_Poster.pdf","relation":"supplementary_material","description":"Poster"}]},"publication_identifier":{"issn":["1520-6149"]}},{"type":"conference","publication":"Positioning Navigation and Communication (WPNC), 2013 10th Workshop on","abstract":[{"lang":"eng","text":"In this paper we present a system for indoor navigation based on received signal strength index information of Wireless-LAN access points and relative position estimates. The relative position information is gathered from inertial smartphone sensors using a step detection and an orientation estimate. Our map data is hosted on a server employing a map renderer and a SQL database. The database includes a complete multilevel office building, within which the user can navigate. During navigation, the client retrieves the position estimate from the server, together with the corresponding map tiles to visualize the user's position on the smartphone display."}],"status":"public","_id":"11818","user_id":"460","department":[{"_id":"54"}],"keyword":["SQL","navigation","smart phones","wireless LAN","RSSI","SQL database","complete multilevel office building","inertial sensor information","inertial smartphone sensors","map renderer","received signal strength index information","relative position estimates","server based indoor navigation","step detection","wireless-LAN access points","Smartphone","fingerprint","indoor navigation","map tile"],"language":[{"iso":"eng"}],"quality_controlled":"1","related_material":{"link":[{"url":"https://groups.uni-paderborn.de/nt/pubs/2013/HoScDrTrScHa2013_Poster.pdf","relation":"supplementary_material","description":"Poster"}]},"year":"2013","citation":{"apa":"Hoang, M. K., Schmitz, S., Drueke, C., Vu, D. H. T., Schmalenstroeer, J., &#38; Haeb-Umbach, R. (2013). Server based indoor navigation using RSSI and inertial sensor information. <i>Positioning Navigation and Communication (WPNC), 2013 10th Workshop On</i>, 1–6. <a href=\"https://doi.org/10.1109/WPNC.2013.6533263\">https://doi.org/10.1109/WPNC.2013.6533263</a>","bibtex":"@inproceedings{Hoang_Schmitz_Drueke_Vu_Schmalenstroeer_Haeb-Umbach_2013, title={Server based indoor navigation using RSSI and inertial sensor information}, DOI={<a href=\"https://doi.org/10.1109/WPNC.2013.6533263\">10.1109/WPNC.2013.6533263</a>}, booktitle={Positioning Navigation and Communication (WPNC), 2013 10th Workshop on}, author={Hoang, Manh Kha and Schmitz, Sarah and Drueke, Christian and Vu, Dang Hai Tran and Schmalenstroeer, Joerg and Haeb-Umbach, Reinhold}, year={2013}, pages={1–6} }","short":"M.K. Hoang, S. Schmitz, C. Drueke, D.H.T. Vu, J. Schmalenstroeer, R. Haeb-Umbach, in: Positioning Navigation and Communication (WPNC), 2013 10th Workshop On, 2013, pp. 1–6.","mla":"Hoang, Manh Kha, et al. “Server Based Indoor Navigation Using RSSI and Inertial Sensor Information.” <i>Positioning Navigation and Communication (WPNC), 2013 10th Workshop On</i>, 2013, pp. 1–6, doi:<a href=\"https://doi.org/10.1109/WPNC.2013.6533263\">10.1109/WPNC.2013.6533263</a>.","chicago":"Hoang, Manh Kha, Sarah Schmitz, Christian Drueke, Dang Hai Tran Vu, Joerg Schmalenstroeer, and Reinhold Haeb-Umbach. “Server Based Indoor Navigation Using RSSI and Inertial Sensor Information.” In <i>Positioning Navigation and Communication (WPNC), 2013 10th Workshop On</i>, 1–6, 2013. <a href=\"https://doi.org/10.1109/WPNC.2013.6533263\">https://doi.org/10.1109/WPNC.2013.6533263</a>.","ieee":"M. K. Hoang, S. Schmitz, C. Drueke, D. H. T. Vu, J. Schmalenstroeer, and R. Haeb-Umbach, “Server based indoor navigation using RSSI and inertial sensor information,” in <i>Positioning Navigation and Communication (WPNC), 2013 10th Workshop on</i>, 2013, pp. 1–6, doi: <a href=\"https://doi.org/10.1109/WPNC.2013.6533263\">10.1109/WPNC.2013.6533263</a>.","ama":"Hoang MK, Schmitz S, Drueke C, Vu DHT, Schmalenstroeer J, Haeb-Umbach R. Server based indoor navigation using RSSI and inertial sensor information. In: <i>Positioning Navigation and Communication (WPNC), 2013 10th Workshop On</i>. ; 2013:1-6. doi:<a href=\"https://doi.org/10.1109/WPNC.2013.6533263\">10.1109/WPNC.2013.6533263</a>"},"page":"1-6","oa":"1","date_updated":"2023-10-26T08:09:36Z","date_created":"2019-07-12T05:28:51Z","author":[{"first_name":"Manh Kha","full_name":"Hoang, Manh Kha","last_name":"Hoang"},{"first_name":"Sarah","last_name":"Schmitz","full_name":"Schmitz, Sarah"},{"first_name":"Christian","last_name":"Drueke","full_name":"Drueke, Christian"},{"full_name":"Vu, Dang Hai Tran","last_name":"Vu","first_name":"Dang Hai Tran"},{"last_name":"Schmalenstroeer","id":"460","full_name":"Schmalenstroeer, Joerg","first_name":"Joerg"},{"last_name":"Haeb-Umbach","full_name":"Haeb-Umbach, Reinhold","id":"242","first_name":"Reinhold"}],"title":"Server based indoor navigation using RSSI and inertial sensor information","main_file_link":[{"url":"https://groups.uni-paderborn.de/nt/pubs/2013/HoScDrTrScHa2013.pdf","open_access":"1"}],"doi":"10.1109/WPNC.2013.6533263"}]