Amer Catovic

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In short range communications, the use of RSS measurements in conjunction with TOA or TDOA leads to enhanced estimation accuracy with respect to the case where only TOA or TDOA are used. In this article, we derive the Cramer-Rao Bound (CRB) for location estimation accuracy of two different hybrid schemes: TOA/RSS and TDOA/RSS. For short ranges, the hybrid(More)
Heterogeneity is the key distinguishing characteristic of wireless sensor networks (WSN), compared to wireless cellular networks (WCN). It may appear in the form of communication ranges of sensor devices, synchronization and signal processing capabilities. In this article, we develop a hybrid location estimation scheme for heterogeneous WSNs with(More)
In this paper, we introduce a new approach to the minimum energy routing (MER) for next generation (NG) multihop wireless networks. We remove the widely used assumption of deterministic, distance-based channel model is removed, and analyze the potentials of MER within the context of the realistic channel model, accounting for shadowing and fading. Rather(More)
In this article, hybrid TOA/RSS and TDOA/RSS location estimation schemes, suitable for shortrange networks, such as WiFi, Ultra-wideband (UWB), Bluethooth or Wireless Sensor Networks (WSN), are examined. First, fundamental theoretical bounds on the estimation accuracy of these schemes are analyzed. Then, a practical Imprementation of the TDOA/RSS hybrid(More)
In this paper we analyze the power efficiency of a user cooperation scheme for multihop wireless networks. In this scheme, the signals are jointly transmitted by two mobile terminals (MTs), emulating transmit macro diversity. We derive the optimal transmit power assignments for the two transmitting MTs and quantify the power efficiency of the scheme. The(More)
In this paper we present a study of different geolocation updating schemes for location aware service provisioning and analyze the ways to their optimization. We propose a hybrid periodic/predictive updating method, in which adaptive update intervals derived from the geolocation information received from the mobile are used for MSs with dominant direction(More)
The aim of this study was to obtain some data on the dynamic strength of premolar teeth. Experiments were performed on three groups of human premolars: intact teeth, teeth prepared for partial veneer crowns with flat occlusal surfaces, and teeth prepared for partial veneer crowns with rounded occlusal surfaces. The loading procedure was performed in a(More)
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