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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 A New Achievable Rate and the Capacity of Some Classes of Multilevel Relay Network | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 135857 10 pages doi 10.1155 2008 135857 Research Article A New Achievable Rate and the Capacity of Some Classes of Multilevel Relay Network Leila Ghabeli and Mohammad Reza Aref Information Systems and Security Lab Department of Electrical Engineering Sharif University of Technology P.O. Box 11365-8639 Tehran Iran Correspondence should be addressed to Leila Ghabeli ghabeli@ee.sharif.edu Received 1 August 2007 Accepted 3 March 2008 Recommended by Liang-Liang Xie A new achievable rate based on a partial decoding scheme is proposed for the multilevel relay network. A novel application of regular encoding and backward decoding is presented to implement the proposed rate. In our scheme the relays are arranged in feed-forward structure from the source to the destination. Each relay in the network decodes only part of the transmitted message by the previous relay. The proposed scheme differs from general parity forwarding scheme in which each relay selects some relays in the network but decodes all messages ofthe selected relays. It is also shown that in some cases higher rates can be achieved by the proposed scheme than previously known by Xie and Kumar. For the classes of semideterministic and orthogonal relay networks the proposed achievable rate is shown to be the exact capacity. The application of the defined networks is very well understood in wireless networking scenarios. Copyright 2008 L. Ghabeli and M. R. Aref. 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 The relay Van der Meulen in 1 describes a single-user communication channel where a relay helps a sender-receiver pair in their communication. In 2 Cover and El Gamal proved a converse result for the relay channel the .
