TY - GEN
T1 - The secrecy capacity of block fading multiuser wireless networks
AU - Chorti, Arsenia
AU - Papadaki, Katerina
AU - Tsakalides, Panagiotis
AU - Poor, H. Vincent
PY - 2013
Y1 - 2013
N2 - The resilience of block fading wireless orthogonal frequency division multiple access (OFDMA) networks to passive eavesdroppers is investigated. The network secrecy capacity is evaluated in scenarios involving a base station and several terminals, some of which constitute passive eavesdroppers. Assuming a block fading Rayleigh channel, the probability of a secrecy outage during a transmission frame is evaluated with respect to a target secrecy rate τ in the following cases: (i) in the absence of any cooperation between the network nodes, and, (ii) when the full multi-user diversity is exploited both by the legitimate users as well as by the eavesdroppers. Remarkably, it is demonstrated that in a network of as few as 12 legitimate users and a single eavesdropper it is possible to transmit 1 bit/sec/Hz with a probability of secrecy outage less than 1%. Furthermore, the delay constrained secrecy capacity of this network is evaluated when the full channel state information (CSI) is available both at the base station and at all receiving nodes. A secure waterfilling scheme is discussed, satisfying a short-term power constraint.
AB - The resilience of block fading wireless orthogonal frequency division multiple access (OFDMA) networks to passive eavesdroppers is investigated. The network secrecy capacity is evaluated in scenarios involving a base station and several terminals, some of which constitute passive eavesdroppers. Assuming a block fading Rayleigh channel, the probability of a secrecy outage during a transmission frame is evaluated with respect to a target secrecy rate τ in the following cases: (i) in the absence of any cooperation between the network nodes, and, (ii) when the full multi-user diversity is exploited both by the legitimate users as well as by the eavesdroppers. Remarkably, it is demonstrated that in a network of as few as 12 legitimate users and a single eavesdropper it is possible to transmit 1 bit/sec/Hz with a probability of secrecy outage less than 1%. Furthermore, the delay constrained secrecy capacity of this network is evaluated when the full channel state information (CSI) is available both at the base station and at all receiving nodes. A secure waterfilling scheme is discussed, satisfying a short-term power constraint.
KW - OFDMA networks
KW - block fading Gaussian channel
KW - delay constrained secrecy capacity
KW - probability of secrecy outage
KW - secure waterfilling
UR - http://www.scopus.com/inward/record.url?scp=84893353881&partnerID=8YFLogxK
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U2 - 10.1109/ATC.2013.6698115
DO - 10.1109/ATC.2013.6698115
M3 - Conference contribution
AN - SCOPUS:84893353881
SN - 9781479910861
T3 - International Conference on Advanced Technologies for Communications
SP - 247
EP - 251
BT - 2013 International Conference on Advanced Technologies for Communications, ATC 2013
T2 - 2013 International Conference on Advanced Technologies for Communications, ATC 2013
Y2 - 16 October 2013 through 18 October 2013
ER -