Title :
Match-Filtering Based TOA Estimation for IR-UWB Ranging Systems
Author :
Wu, Shaohua ; Zhang, Qinyu ; Fan, Rongfei ; Zhang, Naitong
Abstract :
Accurate geolocation techniques using IR-UWB (impulse radio ultra-wideband) signals have gained more and more interests recently. To exploit the fine time resolution of IR- UWB most, TOA (time of arrival) based ranging is the most appropriate technique. Considering the challenges for the design of TOA estimation algorithms in many aspects, a three-step match-filtering detection based algorithm is proposed. First, the search region for DP (direct path) detection is determined; then, a rough detection of DP is made by threshold comparison; last, a refined search process is carried out to obtain the precise location of DP. The threshold-factor in the second step is dynamically set using a joint-metric in terms of kurtosis and RMS (root mean square) delay spread of the match-filtering output. Performance comparisons with other algorithms prove that the proposed three-step algorithm can achieve a good tradeoff between computation efficiency and estimation accuracy. The reliability of TOA estimation result is also discussed. Three levels of reliability are defined and the probability density functions for TOA estimation errors in each level are modeled. It is expected to improve the final location estimation accuracy further by properly incorporating the reliability information into the positioning algorithms.
Keywords :
filtering theory; least mean squares methods; matched filters; signal detection; time-of-arrival estimation; ultra wideband technology; IR-UWB ranging systems; direct path detection; geolocation techniques; impulse radio ultra-wideband signals; kurtosis; match-filtering based TOA estimation; root mean square delay spread; search region; time of arrival; time resolution; Amplitude estimation; Computer vision; Delay; Impedance matching; Information technology; Iterative algorithms; Sampling methods; Signal resolution; Time of arrival estimation; Ultra wideband technology;
Conference_Titel :
Wireless Communications and Mobile Computing Conference, 2008. IWCMC '08. International
Conference_Location :
Crete Island
Print_ISBN :
978-1-4244-2201-2
Electronic_ISBN :
978-1-4244-2202-9
DOI :
10.1109/IWCMC.2008.191