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The wide deployment of Wi-Fi networks empowers the implementation of numerous applications such as Wi-Fi positioning, Location Based Services (LBS), wireless intrusion detection and real-time tracking. Many techniques are used to estimate Wi-Fi client position. Some of them are based on the Time or Angle of Arrival (ToA or AoA), while others use signal power measurements and fingerprinting. All these...
In wireless communication, heterogeneous network is a group of networks that can be utilized to provide particular services. Mobile positioning is one of the most important services that can be offered by heterogeneous networks. Location of the mobile user can be determined by using Location Determination Techniques (LDT) with the availability of the cellular system in the network. However, the accuracy...
Heterogeneous networks are developed to allow communication devices to access the wireless network using different access technologies. In heterogeneous networks, group of networks can be used to provide particular services. Every service can be delivered to the user using the optimum network for that service. Mobile positioning is an important service that can be offered by heterogeneous networks...
Recent headway in the domains of mobile communication and ubiquitous computing has given surge of interest to mobile commerce applications. Current information systems promote concept of information service provision to anyone, anytime and anywhere. Autonomous Decentralized Community System has been proposed to meet the varying requirements of users. In this paper, the decentralized search service...
At least four stations are needed in time difference of arrival (TDOA) position system locating the moving target in 3D space. Positioning precision is influenced by the distribution of location stations importantly. Firstly a positioning precision model is established and the factors affecting the positioning precision are analyzed in line-of-sight (LOS) environments by studying the principle of...
Mobile location estimation via the use of a spatially-dependent signal database is of growing importance. However, this location estimation method usually requires an a priori experimental measurement campaign. To overcome this drawback we propose here a new method of location estimation via the real-time creation of a virtual signal database. The virtual database is created on-demand by an optimized...
We present a certain approach to indoor location tracking based on sensing the strength of received RF signal. Our scheme employs a database of signal strength readings from known locations collected during a prerequisite profiling stage. Subsequently, the problem of estimating the location of a node emitting an RF signal from an unknown place boils down to data mining in the database-to select a...
Efficient management of mobile network resources is a critical task for successful operation. Giving higher priority and quality of service to applications with a high return on invest value, demands for intelligent distribution of bit rates and radio access. The research approach proposed here is based on the fact, that users cannot move freely, but are restricted to streets or rails in position,...
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