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Secrecy degrees of freedom of wireless X networks using artificial noise alignment
KTH, School of Electrical Engineering (EES), Communication Theory.
KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre. KTH, School of Electrical Engineering (EES), Communication Theory.ORCID iD: 0000-0002-5407-0835
KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre. KTH, School of Electrical Engineering (EES), Communication Theory.ORCID iD: 0000-0002-7926-5081
Princeton University.
##### Abstract [en]

The problem of transmitting confidential messages in $M \times K$ wireless X networks is considered, in which each transmitter intends to send one confidential message to every receiver. In particular, the secrecy degrees of freedom (SDOF) of the considered network achieved by an artificial noise alignment (ANA) approach, which integrates interference alignment and artificial noise transmission, are studied. At first, an SDOF upper bound is derived for the $M \times K$ X network with confidential messages (XNCM) to be $\frac{K(M-1)}{K+M-2}$. By proposing an ANA approach, it is shown that the SDOF upper bound is tight when either $K=2$ or $M=2$ for the considered XNCM with time/frequency varying channels. For $K,M \geq 3$, it is shown that an SDOF $\frac{K(M-1)}{K+M-1}$ can be achieved, even when an external eavesdropper appears. The key idea of the proposed scheme is to inject artificial noise to the network, which can be aligned in the interference space at receivers for confidentiality. Moreover, for the network with no channel state information at transmitters, a blind ANA scheme is proposed to achieve the SDOF $\frac{K(M-1)}{K+M-1}$ for $K,M \geq 2$, with reconfigurable antennas at receivers. The proposed method provides a linear approach to handle secrecy coding and interference alignment.

##### Keyword [en]
Secrecy degrees of freedom, artificial noise, interference alignment, wireless X network
##### National Category
Telecommunications
##### Research subject
Information and Communication Technology
##### Identifiers
OAI: oai:DiVA.org:kth-153736DiVA, id: diva2:753396
##### Note

QC 20141114

Available from: 2014-10-07 Created: 2014-10-07 Last updated: 2014-11-14Bibliographically approved

#### Open Access in DiVA

##### File information
File name FULLTEXT02.pdfFile size 576 kBChecksum SHA-512
ff0cce2c1711149ed38d74d25858bb1eefd7b840af33afd93599d9c1fc71b2a97cfe6b1db0d70b3341081c0f2142bfef78e2642e9a8fa14c40ddd33e15166bd5
Type fulltextMimetype application/pdf

#### Authority records BETA

Xiao, MingSkoglund, Mikael

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Zhao, WangXiao, MingSkoglund, Mikael
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Communication TheoryACCESS Linnaeus Centre
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Telecommunications

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Cite
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