tailieunhanh - Báo cáo hóa học: " Research Article Opportunistic Multicasting Scheduling Using Erasure-Correction Coding over Wireless Channels Quang Le-Dang and Tho Le-Ngoc"

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 Opportunistic Multicasting Scheduling Using Erasure-Correction Coding over Wireless Channels Quang Le-Dang and Tho Le-Ngoc | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010 Article ID 595431 17 pages doi 2010 595431 Research Article Opportunistic Multicasting Scheduling Using Erasure-Correction Coding over Wireless Channels Quang Le-Dang and Tho Le-Ngoc Department of Electrical and Computer Engineering McGill University 3480 University Street Montreal Quebec Canada H3A 2A7 Correspondence should be addressed to Tho Le-Ngoc Received 9 August 2010 Accepted 3 November 2010 Academic Editor Zhiqiang Liu Copyright 2010 Q. Le-Dang and T. Le-Ngoc. 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 proposes an opportunistic multicast scheduling scheme using erasure-correction coding to jointly explore the multicast gain and multiuser diversity. For each transmission the proposed scheme sends only one copy to all users in the multicast group at a transmission rate determined by a SNR threshold. Analytical framework is developed to establish the optimum selection of the SNR threshold and coding rate for given channel conditions to achieve the best throughput in both cases of full channel knowledge and only partial channel knowledge of the average SNR and fading type. Numerical results show that the proposed scheme outperforms both the worst-user and best-user schemes for a wide range of average SNR and multicast group size. Our study indicates that full channel knowledge is only significantly beneficial at small multicast group size. For a large multicast group partial channel knowledge is sufficient to closely approach the achievable throughput in the case of full channel knowledge while it can significantly reduce the overhead required for channel information feedback. Further extension of the proposed scheme applied to OFDM system to exploit .