Two step UWB TOA estimation method for WSN ranging
CHEN Kui1,XU Zhao2
(1.Dept. of Information & Electrical Engineering, Xuzhou Institute of Technology, Xuzhou Jiangsu 221008,China;2.School of Information & Electrical Engineering, China University of Mining & Technology, Xuzhou Jiangsu 221008, China)
Abstract:Jointing energy detection and match-filter method can speed up the estimation process and perform accurate estimation. In first step,obtained a rough TOA by non-coherent low-rate energy samples. Then, in the second step,estimated a precise TOA of the direct-path (DP)by correlation match-filter within energy sample periods obtained in anterior step. In proposed algorithm,the parameters such as energy sample period and normalized thresholds play important role.So,discussed and modeled their effects based on maximum-to-minimum energy ratio and noise statistics. Simulation results in IEEE 802.15.4a channel demonstrate that the proposed method outperforms the non-coherent energy-detection method, and decreases the computation-quantity comparing to match-filter. So, the proposed methodis more appreciate to WSN node. ......