About us

The Signal Processing for wireless positioning group is working under the Electrical Engineering unit in the Faculty of Iformation technology and communication sciences, at Tampere University . Tampere University of Technology (TUT) and the University of Tampere (UTA) were merged on 1 January 2019 into new multidisciplinary foundation-based Tampere University (TAU). Formerly the TLTPOS group belonged to TUT. The group location is in Hervanta campus, Tampere, Finland. The group is led by Associate Professor Elena-Simona Lohan.

Our target is to perform research and provide teaching in the area of signal processing for mobile wireless positioning and communications. Some of our main research directions are on: cognitive positioning algorithms for seamless indoor-outdoor localisation, Location Based Services supporting the citizens' well-being in a smart city concept, communication and positioning solutions for drones and aircraft, interference localization, detection, mitigation, and classification, and wearable computing.

The group expertise and research interests encompass the following topics: baseband receiver processing such as acquisition and tracking, Binary Offset Carrier (BOC) modulation studies, Wireless positioning (UMTS/WCDMA mobile positioning, Galileo, GPS and modernised GPS, GLONASS, Beidou), CDMA signal processing algorithms, GNSS receiver design, accurate tracking in multipath channels, unambiguous acquisition of BOC/MBOC signals, sidelobe cancellation methods, indoor fading channel modelling, carrier To Noise Ratio (CNR) estimators, pseudolite-based positioning, indoor & urban positioning and urban channel modelling, carrier phase estimators, Simulink-based models for Galileo and GPS receivers, WLAN-based positioning and cooperative positioning, cellular based positioning, user-driven Location Based Services, user surveys and statistical analysis, compressed sensing for WLAN localisation, 3D localisation and floor detection, spectrum sensing for location purposes, signals of opportunity, 5G positioning, convergence of communication and navigation signals, users mobility models, privacy and physical layer security in mobile localisation, GNSS interference detection and localization, location-based beamforming, IoT communication and localization, etc.

The group was founded in 2003, following the PhD Dissertation of E.S. Lohan on "Multipath delay estimators for fading channels with applications in CDMA receivers and mobile positioning" . Since then, 7 other PhD theses have been completed with full or partial supervision of E.S. Lohan, on the following topics:

  1. 1.

    A. Lahkzouri, "Channel Estimation and Mobile Phone Positioning in CDMA Based Wireless Communication Systems" (2005)

  2. 2.

    A. Burian, "Reduced-Complexity Code Synchronization in Multipath Channels for BOC-Modulated CDMA Signals with Applications in Galileo and Modernized GPS Systems" (2009)

  3. 3.

    D. Skournetou, "Mitigation of Dominant Channel Propagation Effects in GNSS-based Positioning" (2011)

  4. 4.

    Z. Bhuiyan, "Analysis of Multipath Mitigation Techniques for Satellite-based Positioning Applications" (2012)

  5. 5.

    J. Zhang, "Advanced Signal Processing in Multi-mode Multi-frequency Receivers for Positioning Applications" (2013)

  6. 6.

    J. Talvitie, "Algorithms and Methods for Received Signal Strength Based Wireless Localization" (2016)

  7. 7.

    E. Laitinen, "Physical Layer Challenges and Solutions in Seamless Positioning via GNSS, Cellular and WLAN Systems" (2017)

  8. 8.

    P. Silva, "Signals of Opportunity for Positioning Purposes" (2018)

  9. 9.

    P. Bolla, "Advanced Tracking Loop Architectures for Multi-frequency GNSS Receiver"; (2018), in a double PhD degree with Samara National Research University

More than 36 students have also completed their MSc theses on topics related to the TLTPOS research. The theses are available on Dpub repository at TUT

The TLTPOS research group is one of the total of five academic wireless positioning and/or GNSS related research groups at TUT, the other four groups in the largest wireless positioning & GNSS research clusters in Finland being led by Prof. Jari Nurmi, Prof. Robert Piché, Prof. Mikko Valkama and Prof. Jarmo Takala.

The group size has varied over the years. For example, at the end of 2018, two post-docs and five PhD students were involved in the TLTPOS research (some of them can be seen in the picture below)

Some of the researchers involved in the TLTPOS research group, as of October 2018

The TLTPOS research has been funded over the years by the following main sponsors:


Elena-Simona Lohan

Webpage: http://www.cs.tut.fi/~simona/

E-Mail: firstname.surname@tut.fi

Tweeter: @simonalohan

LinkedIn: https://fi.linkedin.com/in/simonalohan