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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: Research Article Hybrid RSS-RTT Localization Scheme for Indoor Wireless Networks | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2010 Article ID 126082 12 pages doi 10.1155 2010 126082 Research Article Hybrid RSS-RTT Localization Scheme for Indoor Wireless Networks Ao 1 1 T 2 D MAÍA 2 u T TYiifoh 2 . Bahillo S. Mazuelas x. 1 A. Lorenzo P. Fern.an.dez J. Prieto x. J. Dxuran. and E. J. Abril2 1 CEDETEL Center for the Development of Telecommunications Edificio Solar Parque Tecnologico deBoecillo 47151 Boecillo Valladolid Spain 2 Department of Signal Theory and Communications and Telematic Engineering University of Valladolid Paseo Belen 15 47011 Valladolid Spain Correspondence should be addressed to A. Bahillo abahillo@cedetel.es Received 16 September 2009 Revised 22 January 2010 Accepted 10 March 2010 Academic Editor Fredrik Gustafsson Copyright 2010 A. Bahillo et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Nowadays a variety of information related to the distance between two wireless devices can be easily obtained. This paper presents a hybrid localization scheme that combines received signal strength RSS and round-trip time RTT information with the aim of improving the previous localization schemes. The hybrid localization scheme is based on an RSS ranging technique that uses RTT ranging estimates as constraints among other heuristic constraints. Once distances have been well estimated the position of the mobile station MS to be located is estimated using a new robust least-squared multilateration RLSM technique that combines the RSS and RTT ranging estimates mitigating the negative effect of outliers. The hybrid localization scheme coupled with simulations and measurements demonstrates that it outperforms the conventional RSS-based and RTT-based localization schemes without using either a tracking technique or a previous calibration .
