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AuthorChraiti M.
AuthorGhrayeb A.
AuthorAssi C.
AuthorHasna , Mazen
Available date2022-04-26T11:06:47Z
Publication Date2018
Publication NameIEEE Transactions on Communications
ResourceScopus
Identifierhttp://dx.doi.org/10.1109/TCOMM.2017.2755654
URIhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85040815765&doi=10.1109%2fTCOMM.2017.2755654&partnerID=40&md5=1509e712dad7355721a694403468387d
URIhttp://hdl.handle.net/10576/30463
AbstractCooperative relaying is often deployed to enhance the communication reliability (i.e., diversity order) and consequently the end-to-end achievable rate. However, this raises several security concerns when the relays are untrusted, since they may have access to the relayed message. In this paper, we study the achievable secrecy diversity order of cooperative networks with untrusted relays. In particular, we consider a network with an N -antenna transmitter (Alice), K single-antenna relays, and a single-antenna destination (Bob). We consider the general scenario, where there is no relation between N and K , and therefore, K can be larger than N. Alice and Bob are assumed to be far away from each other, and all communication is done through the relays, i.e., there is no direct link. Providing secure communication while enhancing the diversity order has been shown to be very challenging. In fact, it has been shown in the literature that the maximum achievable secrecy diversity order for the adopted system model is one (while using artificial noise jamming). In this paper, we adopt a nonlinear interference alignment scheme that we have proposed recently to transmit the signals from Alice to Bob. We analyze the proposed scheme in terms of the achievable secrecy rate and secrecy diversity order. Assuming Gaussian inputs, we derive an explicit expression for the achievable secrecy rate and show analytically that a secrecy diversity order of up to \min (N,K)-1 can be achieved using the proposed technique. We provide several numerical examples to validate the obtained analytical results and demonstrate the superiority of the proposed technique to its counterparts that exist in the literature.
SponsorQatar Foundation;Qatar National Research Fund;Natural Sciences and Engineering Research Council of Canada;Concordia University
Languageen
PublisherInstitute of Electrical and Electronics Engineers Inc.
SubjectAntennas
Numerical methods
Achievable secrecy rates
Antenna transmitters
Communication reliabilities
Cooperative networks
Cooperative relaying
Interference alignment
secrecy diversity
Untrusted relays
Cooperative communication
TitleOn the Achievable Secrecy Diversity of Cooperative Networks with Untrusted Relays
TypeArticle
Pagination39-53
Issue Number1
Volume Number66
dc.accessType Abstract Only


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