An Enhanced TOA Estimation using Search Back Window for Non-Coherent UWB Systems

This paper proposes a scheme for time of arrival (TOA) estimation with employing low-bit analog-to-digital converters (ADCs). The proposed TOA estimation functions in two steps designated by coarse and fine processes to improve TOA accuracy. Towards this, dual overlapped window banks designated as primary and auxiliary windows are utilized together with the search back window (SBW). The performance of the proposed scheme is verified by conducting computer simulations presumed that two types of channel conditions are encountered. The simulation results show that the proposed TOA estimation scheme is superior rather than the conventional method specified by IEEE 802.15.4a technical document even in a condensed multipath environment.