Đang chuẩn bị liên kết để tải về tài liệu:
báo cáo hóa học:" Research Article Measurements and Analysis of Secondary User Device Effects on Digital Television Receivers"

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 Measurements and Analysis of Secondary User Device Effects on Digital Television Receivers | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2009 Article ID510867 13 pages doi 10.1155 2009 510867 Research Article Measurements and Analysis of Secondary User Device Effects on Digital Television Receivers Timothy R. Newman 1 Daniel DePardo 2 Alexander M. Wyglinski 3 Joseph B. Evans 2 Rakesh Rajbanshi 2 Victor R. Petty 2 Dinesh Datla 1 Frederick Weidling 2 Paul J. Kolodzy 4 Michael J. Marcus 5 Gary J. Minden 2 and James A. Roberts2 Electrical and Computer Engineering Virginia Tech Blacksburg VA 24061 USA 2ITTC University of Kansas Lawrence KS 66044 USA 3 Worcester Polytechnic Institute Worcester MA 01609 USA 4Kolodzy Consulting P.O. Box 1443 Centreville VA 20120 USA 5Marcus Spectrum Solutions LLC 8026 Cypress Grove Lane Cabin John MD 20818 USA Correspondence should be addressed to Joseph B. Evans evans@ittc.ku.edu Received 7 July 2009 Accepted 12 August 2009 Recommended by K. Subbalakshmi This article presents results from a study of the potential effects of secondary users operating in unoccupied television spectrum. Television spectrum is known within the wireless communications community as being underutilized making it a prime candidate for dynamic spectrum access. The proposed use of this open spectrum has prompted questions concerning the quantity of available channel space that could be used without negative impact on consumers who view digital television broadcasts and the viability of secondary use of open channels immediately adjacent to a digital television broadcast channel. In this work we investigate secondary device operation in the channels directly adjacent to a desired television channel and the effects upon a selection of consumer digital television DTV receivers. Our observations strongly suggest that secondary users could operate White Space Devices WSDs in unoccupied channel bandwidth directly adjacent to a desired digital television DTV channel with no observable adverse impact upon the reception of