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: IResearch Article Wireless Information-Theoretic Security in an Outdoor Topology with Obstacles: Theoretical Analysis and Experimental Measurements | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2011 Article ID 628747 7 pages doi 2011 628747 Research Article Wireless Information-Theoretic Security in an Outdoor Topology with Obstacles Theoretical Analysis and Experimental Measurements Theofilos Chrysikos 1 Tasos Dagiuklas 2 and Stavros Kotsopoulos1 1 Department of Electrical and Computer Engineering University of Patras 26500 Rio Patras Greece 2Department of Telecommunication Systems and Networks TEIofMessolonghi 30300 Nafpaktos Greece Correspondence should be addressed to Theofilos Chrysikos txrysiko@ Received 15 June 2010 Accepted 20 August 2010 Academic Editor Christos Verikoukis Copyright 2011 Theofilos Chrysikos 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. This paper presents a Wireless Information-Theoretic Security WITS scheme which has been recently introduced as a robust physical layer-based security solution especially for infrastructureless networks. An autonomic network of moving users was implemented via nodes of an ad hoc network for an outdoor topology with obstacles. Obstructed-Line-of-Sight OLOS and Non-Line-of-Sight NLOS propagation scenarios were examined. Low-speed user movement was considered so that Doppler spread could be discarded. A transmitter and a legitimate receiver exchanged information in the presence of a moving eavesdropper. Average Signal-to-Noise Ratio SNR values were acquired for both the main and the wiretap channel and the Probability of Nonzero Secrecy Capacity was calculated based on theoretical formula. Experimental results validate theoretical findings stressing the importance of user location and mobility schemes on the robustness of Wireless Information-Theoretic Security and call for further theoretical analysis. 1. .
