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Secrecy Analysis on Network Coding in Bidirectional Multibeam Satellite Communications

Kalantari, Ashkan and Zheng, Gan and Gao, Zhen and Han, Zhu and Ottersten, Bjorn (2015) 'Secrecy Analysis on Network Coding in Bidirectional Multibeam Satellite Communications.' IEEE Transactions on Information Forensics and Security, 10 (9). pp. 1862-1874. ISSN 1556-6013

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Abstract

Network coding is an efficient means to improve the spectrum efficiency of satellite communications. However, its resilience to eavesdropping attacks is not well understood. This paper studies the confidentiality issue in a bidirectional satellite network consisting of two mobile users who want to exchange message via a multibeam satellite using the XOR network coding protocol. We aim to maximize the sum secrecy rate by designing the optimal beamforming vector along with optimizing the return and forward link time allocation. The problem is nonconvex, and we find its optimal solution using semidefinite programming together with a 1-D search. For comparison, we also solve the sum secrecy rate maximization problem for a conventional reference scheme without using network coding. Simulation results using realistic system parameters demonstrate that the bidirectional scheme using network coding provides considerably higher secrecy rate compared with that of the conventional scheme

Item Type: Article
Uncontrolled Keywords: Physical layer security, network coding, bidirectional satellite communications, secrecy rate, semidefinite programming
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Divisions: Faculty of Science and Health > Computer Science and Electronic Engineering, School of
Depositing User: Jim Jamieson
Date Deposited: 20 Aug 2015 14:16
Last Modified: 20 Aug 2015 14:16
URI: http://repository.essex.ac.uk/id/eprint/14572

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