Threshold-Based TOA Estimation for Impulse Radio UWB Systems
| Citation: |
Sahinoglu, Z.; Guvenc, I., "Threshold-Based TOA Estimation for Impulse Radio UWB Systems", IEEE International Conference on Ultra-Wideband (ICU), pp. 420-425, September 2005 (IEEE Xplore) |
| MERL Report: | TR2005-026 |
Highly dispersive nature of ultra-wideband (UWB) channels makes time of arrival (TOA) estimation extremely challenging, where the leading-edge path is not necessarily the strongest path. Since the bandwidth of a received UWB signal is very large, the Nyquist rate sampling becomes impractical, hence motivating lower complexity and yet accurate ranging techniques at feasible sampling rates. In this paper, we consider TOA estimation based on symbol rate samples that are obtained after a square-law device. An adaptive threshold selection approach based on the minimum and maximum values of the energy samples is introduced, and optimal values of the thresholds for different signal to noise ratios (SNRs) are investigated via simulations. Theoretical closed form expressions are derived for mean absolute TOA estimation error, and compared with simulations using IEEE 802.15.4a channel models.
