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Báo cáo hóa học: "Research Article Cooperative Localization Bounds for Indoor Ultra-Wideband Wireless Sensor Networks"

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 Cooperative Localization Bounds for Indoor Ultra-Wideband Wireless Sensor Networks | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 852509 13 pages doi 10.1155 2008 852509 Research Article Cooperative Localization Bounds for Indoor Ultra-Wideband Wireless Sensor Networks Nayef Alsindi and Kaveh Pahlavan Center for Wireless Information Network Studies Electrical and Computer Engineering Department Worcester Polytechnic Institute Worcester MA 01609 USA Correspondence should be addressed to Nayef Alsindi nalsindi@wpi.edu Received 1 August 2007 Accepted 25 November 2007 Recommended by L. Mucchi In recent years there has been growing interest in ad-hoc and wireless sensor networks WSNs for a variety of indoor applications. Localization information in these networks is an enabling technology and in some applications it is the main sought after parameter. The cooperative localization performance of WSNs is constrained by the behavior of the utilized ranging technology in dense cluttered indoor environments. Recently ultra-wideband UWB Time-of-Arrival TOA based ranging has exhibited potential due to its large bandwidth and high time resolution. The performance of its ranging and cooperative localization capabilities in dense indoor multipath environments however needs to be further investigated. Of main concern is the high probability of non-line of sight NLOS and Direct Path DP blockage between sensor nodes which biases the TOA estimation and degrades the localization performance. In this paper based on empirical models of UWB TOA-based Outdoor-to-Indoor OTI and Indoor-to-Indoor ITI ranging we derive and analyze cooperative localization bounds for WSNs in different indoor multipath environments residential manufacturing floor old office and modern office buildings. First we highlight the need for cooperative localization in indoor applications. Then we provide comprehensive analysis of the factors affecting localization accuracy such as network and ranging model parameters. Copyright 2008 N. Alsindi