Variance of the TOA Estimation for UWB Impulse Radio Systems

A. Chehri, P. Fortier, and P.-M. Tardif (Canada)

Keywords

UWB, TOA, sensor networks, maximum likelihood estimator, noncoherent receiver, CramèrRao bound.

Abstract

Ultra-Wideband (UWB) is an emerging wireless physical layer technology that uses a very large bandwidth it has proven to be useful in short range, high data rate, robust, and low power communications compared to narrow band wireless systems. These features can make UWB systems ideal candidates for reliable data communications between nodes of a wireless sensor network (WSN). However, UWB systems have to cope with great design challenges, including difficulties of TOA estimation. The utility of TOA is numerous like the localization problem. The position estimation using TOA with UWB technology in a sensor network has been studied in [1], and the tracking is discussed in [2]. In this paper we study the variance of the time delay TOA estimation for UWB impulse radio. For that we use a maximum likelihood estimator; we suppose that the node find the time of arrival without a necessity to estimate the channel’s parameters. As result, the node became simpler.

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