tailieunhanh - Báo cáo hóa học: " On-Off Frequency-Shift Keying for Wideband Fading Channels"

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: On-Off Frequency-Shift Keying for Wideband Fading Channels | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2006 Article ID 98564 Pages 1-15 DOI WCN 2006 98564 On-Off Frequency-Shift Keying for Wideband Fading Channels Mustafa CenkGursoy 1 2 H. Vincent Poor 1 and Sergio Verdu1 1 Department of Electrical Engineering Princeton University Princeton NJ 08544 USA 2 Department of Electrical Engineering University of Nebraska-Lincoln Lincoln NE 68588 USA Received 9 March 2005 Revised 20 August 2005 Accepted 15 September 2005 Recommended for Publication by Richard Kozick M-ary on-off frequency-shift keying OOFSK is a digital modulation format in which M-ary FSK signaling is overlaid on on off keying. This paper investigates the potential of this modulation format in the context of wideband fading channels. First it is assumed that the receiver uses energy detection for the reception of OOFSK signals. Capacity expressions are obtained for the cases in which the receiver has perfect and imperfect fading side information. Power efficiency is investigated when the transmitter is subject to a peak-to-average power ratio PAR limitation or a peak power limitation. It is shown that under a PAR limitation it is extremely power inefficient to operate in the very-low-SNR regime. On the other hand if there is only a peak power limitation it is demonstrated that power efficiency improves as one operates with smaller SNR and vanishing duty factor. Also studied are the capacity improvements that accrue when the receiver can track phase shifts in the channel or if the received signal has a specular component. To take advantage of those features the phase of the modulation is also allowed to carry information. Copyright 2006 M. C. Gursoy 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. 1. INTRODUCTION A wide range of digital .

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