Improved OFDM Frequency Syntonization using Signal Decision and Re-Modulation

Hans-Martin Tröger, Jörg Robert, Markus Hartmann, Jörn Thielecke, Albert Heuberger

Abstract:	Modern positioning systems based on a local wireless sensor network require a very precise syntonization of the frequency between the nodes to reach a positioning accuracy in the decimeter range. In this paper we explain, how this syntonization (i.e. frequency synchronization) can be realized wirelessly with the help of DVB-T signals emitted for terrestrial video broadcast. A new algorithm is proposed, which can reach four times better frequency estimation accuracy compared to other state-of-the-art algorithms. Simulations show that the sensor nodes can be syntonized to the carrier frequency of the broadcast signal within a standard deviation of 0.020 Hz or 20 ppb for a realistic carrier-to-noise ratio.
Published in:	Proceedings of the ION 2015 Pacific PNT Meeting April 20 - 23, 2015 Marriott Waikiki Beach Resort & Spa Honolulu, Hawaii
Pages:	999 - 1003
Cite this article:	Tröger, Hans-Martin, Robert, Jörg, Hartmann, Markus, Thielecke, Jörn, Heuberger, Albert, "Improved OFDM Frequency Syntonization using Signal Decision and Re-Modulation," Proceedings of the ION 2015 Pacific PNT Meeting, Honolulu, Hawaii, April 2015, pp. 999-1003.
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