Analysis on the TOA Tracking With DVB-T Signals for Positioning

Liang Chen, Paul Thevenon, Gonzalo Seco-Granados, Olivier Julien, Heidi Kuusniemi

Research output: Contribution to journalArticleResearchpeer-review

14 Citations (Scopus)

Abstract

© 2016 IEEE. The digital television signal is a promising signal of opportunity for ubiquitous wireless positioning. This letter analyzes the time of arrival (TOA) tracking errors of the European standard digital video broadcasting-terrestrial (DVB-T) signals in the context of positioning. The Cramér-Rao lower bound on the unsmoothed TOA estimation is derived and an information-theoretic lower bound (ITLB) is further computed on the smoothed TOA tracking errors in delay locked loop (DLL). Theoretical analysis shows that, the increase of the bandwidth of the equivalent loop filter will lead to larger DLL tracking errors. Despite different bandwidth of the loop filters, the tracking errors derived in theory are asymptotic to ITLB with the increase of signal-noise ratio. Comparatively, the theoretical results of the DLL tracking errors are slightly larger than the ITLB, which is due to the inequality and nonlinear approximation used in the analysis. Theoretical analysis has also verified the effectiveness of the DVB-T signals to be able to achieve high accuracy in positioning.
Original languageEnglish
Article number7574279
Pages (from-to)957-961
JournalIEEE Transactions on Broadcasting
Volume62
Issue number4
DOIs
Publication statusPublished - 1 Dec 2016

Keywords

  • Cramér-Rao lower bound
  • delay locked loop
  • Digital TV
  • orthogonal frequency division multiplexing (OFDM)
  • time of arrival
  • wireless positioning

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