tailieunhanh - Báo cáo: Time-Frequency Spectrum Sharing Scheme for Next Generation OFDM Systems

Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010, Article ID 598707, 11 pages doi: Research Article Time-Frequency Spectrum Sharing Scheme for Next Generation OFDM Systems Ayman Khalil, Matthieu Crussi` re, and Jean-francois H´ lard e e European University of Brittany (UEB) and Institute of Electronics and Telecommunications of Rennes (IETR), INSA, 20 Avenue des Buttes de Co¨smes, 35708 Rennes, France e Correspondence should be addressed to Ayman Khalil, Received 23 July 2010; Revised 17 November 2010; Accepted 13 December 2010 Academic Editor: Kwan L. Yeung Copyright © 2010 Ayman Khalil et al. This is an open access. | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010 Article ID 598707 11 pages doi 2010 598707 Research Article Time-Frequency Spectrum Sharing Scheme for Next Generation OFDM Systems Ayman Khalil Matthieu Crussiere and Jean-francois Helard European University of Brittany UEB and Institute of Electronics and Telecommunications of Rennes IETR INSA 20 Avenue des Buttes de Coesmes 35708 Rennes France Correspondence should be addressed to Ayman Khalil Received 23 July 2010 Revised 17 November 2010 Accepted 13 December 2010 Academic Editor Kwan L. Yeung Copyright 2010 Ayman Khalil 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. Spectrum sharing and multiple-access techniques are challenging matters for future wireless communication systems. Orthogonal frequency division multiplexing OFDM has been considered as the most important physical layer candidate for the next generation wireless systems. Alternatively multiband OFDM MB-OFDM approach has shown some novelty and efficiency for high-rate HR WPAN applications and so has been selected for future HR ultrawideband UWB systems. Based on an optimization problem formulation we jointly consider resource allocation and scheduling to define a novel dynamic timefrequency spectrum sharing mechanism based on the MB-OFDM approach. Viewed as a cross-layer solution the proposed MB-OFDM multiple-access MB-OFDM-MA scheme can achieve an efficient multiuser spectrum sharing under QoS constraints. While the optimization formulation results in a high-complexity time-frequency sharing solution we propose a low-complexity suboptimal solution able to jointly provide fairness provision with the QoS support. Compared with traditional orthogonal frequency division multiple access OFDMA the .