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Physical Layer Security in Multibeam Satellite Systems
KTH, School of Electrical Engineering (EES), Signal Processing. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.ORCID iD: 0000-0003-2298-6774
2012 (English)In: IEEE Transactions on Wirelss Communications, ISSN 1536-1276, Vol. 11, 852-863 p.Article in journal (Refereed) Published
Abstract [en]

Security threats introduced due to the vulnerability of the transmission medium may hinder the proliferation of Ka band multibeam satellite systems for civil and military data applications. This paper sets the analytical framework and then studies physical layer security techniques for fixed legitimate receivers dispersed throughout multiple beams, each possibly surrounded by multiple (passive) eavesdroppers. The design objective is to minimize via transmit beamforming the costly total transmit power on board the satellite, while satisfying individual intended users' secrecy rate constraints. Assuming state-of-the-art satellite channel models, when perfect channel state information (CSI) about the eavesdroppers is available at the satellite, a partial zero-forcing approach is proposed for obtaining a low-complexity sub-optimal solution. For the optimal solution, an iterative algorithm combining semi-definite programming relaxation and the gradient-based method is devised by studying the convexity of the problem. Furthermore, the use of artificial noise as an additional degree-of-freedom for protection against eavesdroppers is explored. When only partial CSI about the eavesdroppers is available, we study the problem of minimizing the eavesdroppers' received signal to interference-plus-noise ratios. Simulation results demonstrate substantial performance improvements over existing approaches.

Place, publisher, year, edition, pages
2012. Vol. 11, 852-863 p.
National Category
Signal Processing
URN: urn:nbn:se:kth:diva-90967DOI: 10.1109/TWC.2011.120911.111460ISI: 000300426000042ScopusID: 2-s2.0-84857366311OAI: diva2:507601
ICT - The Next Generation

QC 20120402

Available from: 2012-03-05 Created: 2012-03-05 Last updated: 2013-04-11Bibliographically approved

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Ottersten, Björn
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Signal ProcessingACCESS Linnaeus Centre
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