The Fraunhofer-Gesellschaft (www.fraunhofer.com) currently operates 76 institutes and research institutions throughout Germany and is the world’s leading applied research organization. Around 30 000 employees work with an annual research budget of 2.9 billion euros.
The Fraunhofer IIS in cooperation with the TU Ilmenau have established a testbed to enable the localization of mobile endpoints using the LPWAN standard mioty for application in current research topics such as the Internet of Things (IoT). The localization is based on time difference of arrival measurements (TDoA).
The mioty standard uses the so-called TSMA (Telegram Splitting Multiple Access) techniques to achieve a high level of robustness against interference. The telegrams consist of single bursts that are distributed pseudo-randomly in frequency and time. However, the long transmission time of a single telegram (up to 4s) in combination with noisy oscillators can cause severe degradation of the localization accuracy. One way to become more robust against this effect is to adjust the distribution of the individual bursts in time and frequency. In the context of this work, various possibilities are to be investigated as to how this waveform could be modified.
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