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This paper proposes the configuration of a novel wideband patch antenna system suitable especially for indoor mobile communication applications. This configuration consists of an elevated patch antenna, which has different feed structure from classical patch antenna feed configurations that the antenna is fed by an inverted L-shape structure. The antenna structure is designed, simulated and manufactured...
This paper introduces a technology convergence adaptor for a previously presented Inter-MAC architecture for heterogeneous home area networks. Its main task is to translate technology-dependent link metrics into a machine readable common language. This language allows for the description of various service and application classes and provides means to describe link metrics of underlying MAC protocols...
Precise localization has attracted considerable traction in the area of cooperative assignments for robots in indoor applications. When dealing with indoor applications we are limited to the type of signals that can be used for precise localization which is our prime goal. There are limitations to the well known GPS and also vision-based modality where the non-line-of-sight (NLOS) conditions can significantly...
In this paper, we consider a simple loading algorithm for Orthogonal Frequency Division Multiplexing systems in WLAN for signal spectrum optimization. The algorithm is based on the margin adaptive loading criterion and its performance over 5GHz indoor wireless channels.
A positioning algorithm based on the relative order of the received signal strengths is discussed. This algorithm in conjunction with the ray-tracing propagation model can have promising performance for indoor environments without any needs for extensive set of a priori training. Enhancements to the positioning algorithm will be proposed and investigated. Two sets of experimental results with 802...
In this paper, the fingerprinting technique is employed to locate a mobile user inside a building. The fingerprint information, collected from real in-building measurements, is formed by three IEEE 802.11b access points' signal strength data received by the mobile user. Three different pattern-matching algorithms have been studied: the multi-layer perceptron (MLP) neural network, the generalized radial...
In this paper we present a simple ray-sector model of signal strength for indoor 802.11 networks. Signal strength is an important parameter for a variety of important wireless networking tasks, such as localization and topology control. A sufficiently accurate, yet generic, method of generating signal strength maps is needed in order to accurately simulate, design and evaluate these systems. Our ray-sector...
Instead of just offering connectivity for their customers, public network carriers are seeking ways to add value to their transport services. Next-generation networks (NGN) tie together telecom and IP networks enabling new convergence services which are potential sources of revenue for carriers and service providers alike. Location-based services (LBS) are an example of such services. This paper presents...
For increasing needs of positioning technology, easy and simple indoor positioning system is desired. Wireless LAN based positioning system is a major candidate of indoor positioning technology. Conventional WLAN based systems require high installation cost or long site calibration before use. In this paper, we describe the implementation of simple WLAN based indoor positioning system WiPS. WiPS uses...
In this paper, we present a novel method to adapt the temporal radio maps for indoor location estimation by offsetting the variational environmental factors using data mining techniques and reference points. Environmental variations, which cause the signals to change from time to time even at the same location, present a challenging task for indoor location estimation in the IEEE 802.11b infrastructure...
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