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 Optimal Channel Selection for Spectrum-Agile Low-Power Wireless Packet Switched Networks in Unlicensed Band | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 896420 10 pages doi 2008 896420 Research Article Optimal Channel Selection for Spectrum-Agile Low-Power Wireless Packet Switched Networks in Unlicensed Band Ali Motamedi and Ahmad Bahai Department of Electrical Engineering Stanford University University of California at Berkeley and National Semiconductor Stanford CA 94305 USA Correspondence should be addressed to Ali Motamedi motamedi@ Received 1 June 2007 Revised 8 December 2007 Accepted 2 March 2008 Recommended by Milind Buddhikot This paper addresses the problem of optimal channel selection for spectrum-agile low-powered wireless networks in unlicensed bands. The channel selection problem is formulated as a multiarmed bandit problem enabling us to derive the optimal selection rules. The model assumptions about the interfering traffic that motivates this formulation are also validated through traffic measurements as an example of a packet switched network. Finally the performance of the optimal dynamic channel selection is investigated through simulation. The simulation results show that the proposed algorithm consistently tracks the best channel compared to other heuristic schemes. Copyright 2008 A. Motamedi and A. Bahai. 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. 1. INTRODUCTION Interest in wireless technology has experienced an explosive growth over the last decades. The finalization of diverse standards has eased the development of wireless applications. Specially those devices operating in the unlicensed Industrial Scientific and Medical ISM band. This popularity caused the spectrum to be congested. Since the current applications using the ISM band operating on different standards they might not be able to
