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Physical layer security for multiuser relay networks

Physical layer security for multiuser relay networks

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In this chapter, we will present criteria for user selection and relay selection to enhance the physical layer security in multiuser multi-relay networks. Specifically, for multiuser networks with multiple amplify-and-forward (AF) relays, we present three criteria to select the best relay and user pair. Criteria I and II study the received signal-to-noise ratio (SNR) at the receivers and perform the selection by maximising the SNR ratio ofthe user to the eavesdroppers. To this end, criterion I relies on both the main and eavesdropper links, while criterion II relies on the main links only. Criterion III is the standard max-min selection criterion, which maximises the minimum of the dual-hop channel gains of main links. For the three selection criteria, we examine the system secrecy performance by deriving the analytical expressions for the secrecy outage probability. We also derive the asymptotic analysis for the secrecy outage probability with high main-to-eavesdropper ratio.

Chapter Contents:

  • 7.1 AF relaying
  • 7.1.1 Relay and user selection
  • 7.1.2 Lower bound
  • 7.1.2.1 Criterion I
  • 7.1.2.2 Criteria II and III
  • 7.1.3 Asymptotic analysis
  • 7.1.3.1 Criterion I
  • 7.1.3.2 Criteria II and III
  • 7.1.4 Numerical and simulation results
  • 7.2 DF relaying
  • 7.2.1 User and relay selection criteria
  • 7.2.1.1 Criterion I
  • 7.2.1.2 Criterion II
  • 7.2.2 Closed-form analysis
  • 7.2.2.1 A tight lower bound for Criterion I
  • 7.2.2.2 Exact formula for Criterion II
  • 7.2.3 Asymptotic analysis
  • 7.2.3.1 Asymptotic Pout for Criterion I
  • 7.2.3.2 Asymptotic Pout for Criterion II
  • 7.2.4 Numerical and simulation results
  • Appendix A
  • A.1 Proof of Theorem 1
  • Appendix B
  • B.1 Proof of Theorem 2
  • Appendix C
  • C.1 Proof of Theorem 3
  • References

Inspec keywords: relay networks (telecommunication); probability; amplify and forward communication

Other keywords: standard max-min selection criterion; dual-hop channel gains; physical layer security; secrecy outage probability; amplify-and-forward relays; multiuser multirelay networks

Subjects: Other topics in statistics; Radio links and equipment

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