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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: An Innovative Gateway for Indoor Positioning | Hindawi Publishing Corporation EURASIP Journal on Applied Signal Processing Volume 2006 Article ID81714 Pages 1-10 DOI 10.1155 ASP 2006 81714 An Innovative Gateway for Indoor Positioning Giannis F. Marias Giorgos Papazafeiropoulos Nikos Priggouris Stathes Hadjiefthymiades and Lazaros Merakos Department of Informatics Telecommunications University of Athens Panepistimiopolis Athens 15784 Greece Received 1 June 2005 Revised 4 January 2006 Accepted 13 January 2006 Enabling the pervasive paradigm requires the incorporation of location information. Retrieving location data has been a field of ongoing research for both the outdoor and indoor wireless systems. The results in the cellular scenario are already mature and location architectures have been standardized. Recent research is ongoing for indoor-positioning mechanisms resulting in implementations that vary. A platform that enables the deployment of location-based services in heterogeneous indoor and WLANbased communication systems will address difficulties in cooperating with different positioning systems. For that purpose we have designed a novel entity called Gateway WLAN Location Center GWLC which hides the heterogeneous functions of the indoor positioning architectures incorporating a unified framework for retrieving location data of users and objects. The GWLC platform has been designed to meet objectives such as modularity scalability as well as portability and to facilitate open interfaces. In this contribution we elaborate on the design principles and the functionality of GWLC. We also provide performance results obtained through real experiments. Copyright 2006 Hindawi Publishing Corporation. All rights reserved. 1. INTRODUCTION During the last years cellular operators service and content providers have been trying to identify the needs of a fully connected user facilitating pervasive communications and ubiquitous computing concepts. The most promising direction seems to be the development of context-aware