Link Selection for Secure Cooperative Networks with Buffer-Aided
Relaying
release_lbbrpy22zjevfddt5zyiukv5ae
by
Ji He, Jia Liu, Yulong Shen, Xiaohong Jiang
2018
Abstract
This paper investigates the secure communication in a two-hop cooperative
wireless network, where a buffer-aided relay is utilized to forward data from
the source to destination, and a passive eavesdropper attempts to intercept
data transmission from both the source and relay. Depending on the availability
of instantaneous channel state information of the source, two cases of
transmission mechanisms, i.e., adaptive-rate transmission and fixed-rate
transmission are considered. To enhance the security of the system, novel link
selection policies are proposed for both cases to select source-to-relay,
relay-to-destination, or no link transmission based on the channels qualities.
Closed-form expressions are derived for the end-to-end secrecy outage
probability (SOP), secrecy outage capacity (SOC), and exact secrecy throughput
(EST), respectively. Furthermore, we prove the condition that EST reaches its
maximum, and explore how to minimize the SOP and maximize the SOC by optimizing
the link selection parameters. Finally, simulations are conducted to
demonstrate the validity of our theoretical performance evaluation, and
extensive numerical results are provided to illustrate the efficiency of the
proposed link selection polices for the secure communication in two-hop
cooperative networks.
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