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Fan, Y., Liao, X. & Vasilakos, A. V. (2017). Physical Layer Security Based on Interference Alignment in K-User MIMO Y Wiretap Channels. IEEE Access, 5, 5747-5759
Open this publication in new window or tab >>Physical Layer Security Based on Interference Alignment in K-User MIMO Y Wiretap Channels
2017 (English)In: IEEE Access, E-ISSN 2169-3536, Vol. 5, p. 5747-5759Article in journal (Refereed) Published
Abstract [en]

This paper studies the secure degree of freedom (SDOF) of the multiway relay wiretap system K -user MIMO Y wiretap channel, where each legitimate user equipped with M antennas intends to convey independent signals via an intermediate relay with N antennas. There exists an eavesdropper which is equipped with Neantennas close to the legitimate users. In order to eliminate the multiuser interference and keep the system security, interference alignment is mainly utilized in the proposed broadcast wiretap channel (BWC) and multi-access BWC (MBWC), and cooperative jamming is adopted as a supplementary approach in the MBWC model. The general feasibility conditions of the interference alignment are deduced asM≥K−1,2M>N and N≥((K(K−1))/2) . In the BWC model, we have deduced the secure degrees of freedom (SDOF) asKmin{M,N}−min{Ne,K(K−1)/2} , which is always a positive value. While in the MBWC model, the SDOF is given by Kmin{M,N} . Finally, since the relay transmits the synthesized signals of the legal signal and the jamming signal in the MBWC model, we propose a power allocation scheme to maximize the secrecy rate. Simulation results demonstrate that our proposed power allocation scheme can improve secrecy rate under various antenna configurations.

Place, publisher, year, edition, pages
IEEE, 2017
National Category
Media and Communication Technology
Research subject
Mobile and Pervasive Computing
urn:nbn:se:ltu:diva-63433 (URN)10.1109/ACCESS.2017.2694478 (DOI)000401431300064 ()2-s2.0-85028048342 (Scopus ID)

Validerad;2017;Nivå 2;2017-06-02 (rokbeg)

Available from: 2017-05-18 Created: 2017-05-18 Last updated: 2018-07-10Bibliographically approved

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