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Hendrik Bojan Lottermoser, "Experimentelle Evaluation des 802.11 FTM Protokolls mit COTS WiFi Hardware," Bachelor Thesis, School of Electrical Engineering and Computer Science (EECS), TU Berlin (TUB), June 2022. (Advisor: Anatolij Zubow; Referees: Falko Dressler and Thomas Sikora)


The IEEE 802.11mc revision of the WiFi standard introduced the Fine Time Measure- ment (FTM) protocol, which makes it possible to determine the distance between two stations by measuring the Round Trip Time (RTT) of WiFi signals. This bachelor thesis aims to experimentally evaluate this protocol with particular focus on the following objectives: (1) determination of the influence of multi path propagation (2) within indoor and outdoor surroundings and (3) signal interference as well as (4) the evaluation of the results. The interference and its effects were also part of a simulation,providing deeper insights into the topic of preamble detection and its influence on the distance measurements. Additionall experiments regarding bandwidth were conducted, which implicitly might point out the influence of the sampling frequency on FTM. For the experiments the implementation of the FTM protocol on the Intel 8260 WiFi chip was used. The open source software hostapd and the command line tool iw were utilized to start a measurement. To perform these measurements mini PCs were equipped with FTM compliant WiFi chips. As operating system Ubuntu 16.04 with a specific kernel version was installed. The results demonstrate, that FTM works best in open areas with almost no multipath propagation, which might also be the biggest obstacle to overcome. The increase in bandwidth drastically increased the accuracy of the measurements, which might be the result of an increased sampling rate. When FTM is interfered with ZigBee signals, the estimated distance is more likely to be underestimated with increasing ZigBee singal strength. Similar results can be attained by attenuating the Wifi signal of FTM. The experiments demonstrate that FTM can be optimized substantially by increasing the Bandwidth of the measurement and calibrating the system in the environment where the measurements will be conducted. The results are discussed in light of similar results in literature covering the FTM protocol.

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Hendrik Bojan Lottermoser

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    author = {Lottermoser, Hendrik Bojan},
    title = {{Experimentelle Evaluation des 802.11 FTM Protokolls mit COTS WiFi Hardware}},
    advisor = {Zubow, Anatolij},
    institution = {School of Electrical Engineering and Computer Science (EECS)},
    location = {Berlin, Germany},
    month = {6},
    referee = {Dressler, Falko and Sikora, Thomas},
    school = {TU Berlin (TUB)},
    type = {Bachelor Thesis},
    year = {2022},

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