[{"date_updated":"2022-01-06T06:51:09Z","author":[{"first_name":"Manh Kha","last_name":"Hoang","full_name":"Hoang, Manh Kha"},{"full_name":"Haeb-Umbach, Reinhold","last_name":"Haeb-Umbach","first_name":"Reinhold","id":"242"}],"publication_identifier":{"issn":["1520-6149"]},"title":"Parameter estimation and classification of censored Gaussian data with application to WiFi indoor positioning","year":"2013","doi":"10.1109/ICASSP.2013.6638353","language":[{"iso":"eng"}],"main_file_link":[{"open_access":"1","url":"https://groups.uni-paderborn.de/nt/pubs/2013/HoHa2013.pdf"}],"abstract":[{"lang":"eng","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."}],"related_material":{"link":[{"url":"https://groups.uni-paderborn.de/nt/pubs/2013/HoHa2013_Poster.pdf","relation":"supplementary_material","description":"Poster"}]},"publication":"38th International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2013)","department":[{"_id":"54"}],"type":"conference","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"],"date_created":"2019-07-12T05:28:48Z","status":"public","user_id":"44006","_id":"11816","page":"3721-3725","citation":{"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.","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>.","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>","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} }","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>.","short":"M.K. Hoang, R. Haeb-Umbach, in: 38th International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2013), 2013, pp. 3721–3725.","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>"},"oa":"1"},{"user_id":"5786","_id":"38104","language":[{"iso":"eng"}],"date_updated":"2023-01-23T11:50:27Z","status":"public","year":"2007","title":"A Low-Cost Positioning System for Location-Aware Applications in Smart Homes","author":[{"full_name":"Schäfer, Robbie","first_name":"Robbie","last_name":"Schäfer"},{"full_name":"Müller, Wolfgang","first_name":"Wolfgang","last_name":"Müller","id":"16243"},{"last_name":"Deimann","first_name":"Roman","full_name":"Deimann, Roman"},{"first_name":"Bernd","last_name":"Kleinjohann","full_name":"Kleinjohann, Bernd"}],"type":"conference","keyword":["Positioning Systems","Camera Based","Cost Efficiency","Smart Home Applications"],"department":[{"_id":"672"}],"date_created":"2023-01-23T11:50:18Z","place":"San Jose, USA","abstract":[{"text":"Location-aware services for private use such as GPS-\r\nbased navigation systems and GSM-based offerings\r\nhave become quite a success for outdoor applications,\r\nwhile indoor positioning systems are still mainly\r\nemployed for professional use only. The main reasons\r\nare cost issues and the complexity of setup and\r\nmaintenance of those systems. In this paper we\r\npresent CaMPTrack (Camera-based Multiple Person\r\nTracker), a prototype of a webcam-based positioning\r\nsystem and discuss its application and development\r\nchallenges.","lang":"eng"}],"publication":"Proceedings of the Workshop on Mobile Spatial Interaction at CHI 2007","citation":{"bibtex":"@inproceedings{Schäfer_Müller_Deimann_Kleinjohann_2007, place={San Jose, USA}, title={A Low-Cost Positioning System for Location-Aware Applications in Smart Homes}, booktitle={Proceedings of the Workshop on Mobile Spatial Interaction at CHI 2007}, author={Schäfer, Robbie and Müller, Wolfgang and Deimann, Roman and Kleinjohann, Bernd}, year={2007} }","ama":"Schäfer R, Müller W, Deimann R, Kleinjohann B. A Low-Cost Positioning System for Location-Aware Applications in Smart Homes. In: <i>Proceedings of the Workshop on Mobile Spatial Interaction at CHI 2007</i>. ; 2007.","mla":"Schäfer, Robbie, et al. “A Low-Cost Positioning System for Location-Aware Applications in Smart Homes.” <i>Proceedings of the Workshop on Mobile Spatial Interaction at CHI 2007</i>, 2007.","short":"R. Schäfer, W. Müller, R. Deimann, B. Kleinjohann, in: Proceedings of the Workshop on Mobile Spatial Interaction at CHI 2007, San Jose, USA, 2007.","chicago":"Schäfer, Robbie, Wolfgang Müller, Roman Deimann, and Bernd Kleinjohann. “A Low-Cost Positioning System for Location-Aware Applications in Smart Homes.” In <i>Proceedings of the Workshop on Mobile Spatial Interaction at CHI 2007</i>. San Jose, USA, 2007.","ieee":"R. Schäfer, W. Müller, R. Deimann, and B. Kleinjohann, “A Low-Cost Positioning System for Location-Aware Applications in Smart Homes,” 2007.","apa":"Schäfer, R., Müller, W., Deimann, R., &#38; Kleinjohann, B. (2007). A Low-Cost Positioning System for Location-Aware Applications in Smart Homes. <i>Proceedings of the Workshop on Mobile Spatial Interaction at CHI 2007</i>."}}]