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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 Secrecy Capacity of a Class of Orthogonal Relay Eavesdropper Channels | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2009 Article ID 494696 14 pages doi 10.1155 2009 494696 Research Article Secrecy Capacity of a Class of Orthogonal Relay Eavesdropper Channels Vaneet Aggarwal Lalitha Sankar A. Robert Calderbank EURASIP Member and H. Vincent Poor Department of Electrical Engineering Princeton University Princeton NJ 08544 USA Correspondence should be addressed to Vaneet Aggarwal vaggarwa@princeton.edu Received 1 December 2008 Accepted 9 June 2009 Recommended by Shlomo Shamai Shitz The secrecy capacity of relay channels with orthogonal components is studied in the presence of an additional passive eavesdropper node. The relay and destination receive signals from the source on two orthogonal channels such that the destination also receives transmissions from the relay on its channel. The eavesdropper can overhear either one or both of the orthogonal channels. Inner and outer bounds on the secrecy capacity are developed for both the discrete memoryless and the Gaussian channel models. For the discrete memoryless case the secrecy capacity is shown to be achieved by a partial decode-and-forward PDF scheme when the eavesdropper can overhear only one of the two orthogonal channels. Two new outer bounds are presented for the Gaussian model using recent capacity results for a Gaussian multiantenna point-to-point channel with a multiantenna eavesdropper. The outer bounds are shown to be tight for two subclasses of channels. The first subclass is one in which the source and relay are clustered and the eavesdropper receives signals only on the channel from the source and the relay to the destination for which the PDF strategy is optimal. The second is a subclass in which the source does not transmit to the relay for which a noise-forwarding strategy is optimal. Copyright 2009 Vaneet Aggarwal et al. This is an open access article distributed under the Creative Commons Attribution License which .
