The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Location Fingerprinting is one of the radio positioning techniques which has been proposed in the field of Location Based Services (LBS). Considering the actual trends towards energy efficient systems and green networking, reducing the energy consumption has become a challenging issue in the context of fingerprinting systems. In this paper we present a clustering technique which aims to compress the...
We present an analysis of the time of arrival (TOA) and time difference of arrival (TDOA) based positioning methods in Non-Line-of-Sight (NLOS) environments. Single path propagation is assumed. The positioning accuracy is investigated in terms of Dilution of precisions (DOPs) depending on different NLOS cases. We then show that the weighted DOP (WDOP) is equal to the Cramer-Rao Lower Bound (CRLB)...
Equipped with recent advances in electronics and communication, wireless sensor networks gained a rapid development to provide reliable information with higher Quality of Service (QoS) at lower costs. This paper presents a realtime tracking system developed as a part of the ISSNIP BigNet Testbed project. Here a GPS receiver was used to acquire position information of mobile nodes and GSM technology...
In this paper, we discuss a new coastal tide collecting technology which is based on the integration of the CDMA Wireless network and GPS-RTK technology. With this new tide collecting technology, we can get the real-time tide level easily. At the same time, the FFT that is used for tide signal extraction is also discussed. Finally, its accuracy is verified by the experiment.
Distributed sensor networks are used for asset monitoring within industrial environments. Energy efficient operation of such systems is an important characteristic. Mobile data collectors have been proposed as an approach for reducing energy requirements of data dissemination. Macro level optimisation techniques for selecting the overall best route for data collection exists, but they often oversee...
Tracking in WiMax networks is gaining a lot of interest; especially after the mobile WiMax became one of the emerging technologies that promote low-cost deployment and evolving to provide IP-based services of high mobility including providing location-based services (LBS). Therefore, locating users in a cheap way that depend on the available network resources is becoming more and more interesting...
Utilizing time-of-arrival measurements, we propose a recursive algorithm for estimating the location of a mobile station in a non-line-of-sight environment. By formulating the problem in a factor graph framework, messages are iteratively passed to obtain the mobile station position. Numerical results show that the proposed algorithm is more computationally attractive or reliable than existing methods...
All wireless systems require the precise timing synchronization to satisfy the higher quality of service (QoS) requirements. Particularly, timing synchronization between base stations (BSs) during soft handover is required to increase the diversity gain of soft handover. Current timing synchronization protocol (e.g. IEEE1588, GPS) updates the synchronization at fixed time duration and it causes the...
We consider synchronization techniques required to enhance the cellular network capacity using base station cooperation. In the physical layer, local oscillators are disciplined by the global positioning system (GPS) and over the backbone network for outdoor and indoor base stations, respectively. In the medium access control (MAC) layer, the data flow can be synchronized by two approaches. The first...
Traffic congestion on major roadways costs our nation billions of dollars in lost earnings, wasted fuel consumption, injury and loss of human life. Providing motorists with real time roadway conditions is essential to mitigating traffic congestion. We propose a novel real-time messaging system that can be used to communicate imminent traffic conditions to motorists. Having such information can allow...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.