Abstract
A relay network in which a source wishes to convey
a confidential message to a legitimate destination with the assistance
of trusted relays is considered. In particular, cooperative
beamforming and user selection techniques are applied to protect
the confidential message. The secrecy rate (SR) and secrecy
outage probability (SOP) of the network are investigated first,
and a tight upper bound for the SR and an exact formula for the
SOP are derived. Next, asymptotic approximations for the SR and
SOP in the high signal-to-noise ratio (SNR) regime are derived for
two different schemes: i) cooperative beamforming and ii) multiuser
selection. Further, a new concept of cooperative diversity
gain, namely, adapted cooperative diversity gain (ACDG), which
can be used to evaluate security level of a cooperative relaying
network, is investigated. It is shown that the ACDG of cooperative
beamforming is equal to the conventional cooperative diversity
gain of traditional multiple-input single-output networks, while
the ACDG of the multiuser scenario is equal to that of traditional
single-input multiple-output networks.
Original language | English |
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Pages (from-to) | 5039 - 5051 |
Journal | IEEE Transactions on Communications |
Volume | 63 |
Issue number | 12 |
Early online date | 26 Oct 2015 |
DOIs | |
Publication status | Published - Dec 2015 |