Robust Multi-Carrier Frame Synchronization for Localization Systems with Ultrasound
Conference: OFDM 2014 - 18th International OFDM Workshop 2014 (InOWo'14)
08/27/0000 - 08/28/2014 at Essen, Deutschland
Proceedings: OFDM 2014
Pages: 8Language: englishTyp: PDF
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Authors:
Ens, Alexander; Reindl, Leonhard M. (Laboratory for Electrical Instrumentation, University of Freiburg, Germany)
Janson, Thomas; Schindelhauer, Christian (Computer Networks and Telematics, University of Freiburg, Germany)
Abstract:
Time of arrival (TOA) based localization schemes compute the positions from the signal delay between senders and receivers in a network and thus have high requirements for the synchronization, in particular for the synchronization based on line-of-sight (LOS) signals. We propose an ultrasound system based on pure LOS synchronization and data transmission for sender identification. We use two carriers with 38 kHz, respectively 40 kHz, in a baseband OFDM scheme and by comparing the phase shift of both carriers we estimate with the Cramer-Rao lower bound a distance error between sender and receiver of 0.047 mm for a signal-to-noise ratio (SNR) of 10 dB. We transmit 8 bits in 1.5 ms for a robust localization, where we expect no intersymbol interferences for most realistic scenarios.