Vinay Prabhu Miguel.R.D.Rodrigues Instituto de...
Transcript of Vinay Prabhu Miguel.R.D.Rodrigues Instituto de...
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Vinay PrabhuMiguel.R.D.Rodrigues
Instituto de TelecomunicacoesDept. of Computer Science, University of Porto, Portugal
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Organisation of the talk
Scenario Description :
What is Physical layer Security all about?
System model: The Rayleigh fading SISOME/SIMOSE models
Definition of parameters of interest: Probability of existence and Outage; Outage Secrecy capacity
Main results
Conclusions
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Scenario Description and Problem Formulation: The jargon of Alice, Bob and the evil Eve ...
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Scenario Description and Problem Formulation: The two approaches ...
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System model: The Rayleigh fading SISOME/SIMOSE models
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System model: The Rayleigh fading SISOME/SIMOSE models
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.... Other comparison scenarios...
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....OTHER COMPARISON SCENARIOS ...
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SDC AND MRC reception at the eavesdropper
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An opportunistic secrecy achieving scheme
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Secrecy parameters of interest
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Secrecy parameters of interest
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The PDFs ...
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Effect of introduction of the eavesdropper
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....with M-antenna eavesdroppers..
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M-antenna SDC = M independent eavesdroppers
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Single M-antenna eavesdropper is potentially more effective than M- single antenna eavesdroppers
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Asymptotic analysis ...
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...Transition from linear dominance to factorial dominance...
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Outage secrecy capacities ....
2 2
2 2
2 2
1
:
( ) log (1 ) log (1 (1 ) )
:
( ) log (1 ) log (1 (1 ) )
/ :
( ) log (1 ) log (1 (1 ) )
1, ln( )
out M W
out M W
out M W
M
n
SISOSE
C
SISOME MRC
C M
SISOME SDC M eavesdroppers
C K
K K Mn
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Secrecy capacity comparisons..
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Most hostile scenario ...
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Effect of the Rician factor ...
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Almost as if the eavesdropper had an AWGN link with the transmitter...
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Overall comparison ...
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Effect of spatial correlation between the eavesdropper antennas – The SISO2E system
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2 independent eavesdroppers VS one 2-antenna eavesdropper (with antenna correlation)
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The revelations ... One M-antenna eavesdropper performing SDC reception is
equivalent to M single antenna independent eavesdroppers
One M-antenna eavesdropper performing MRC/EGC reception is superior to M single antenna independent eavesdroppers
The dominance of the M-antenna eavesdropper performing MRC reception over M single antenna independent eavesdroppers is LINEAR under high main channel SNR conditions and FACTORIAL under low main channel SNR conditions (with respect to the increase in the number of antennas.)
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The revelations ...One 2-antenna eavesdropper performing MRC reception is always superior to 2 single antenna independent eavesdroppers provided,
The main channel average SNR is greater than the eavesdropper channel average SNR.
When main channel average SNR is lesser than the eavesdropper channel average SNR,
The MRC eavesdropper enjoys superiority provided the spatial correlation coefficient (ρ)is less than 0.5
If the eavesdropper has a strong LOS path with the transmitter, the fall in probability of existence is exponential.
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THANK YOU !!
QUESTIONS ??