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International Wireless Communications and Mobile Computing Conference (IWCMC)

Secrecy Capacity for Multi-Antenna Wireless-Powered AF Relaying Systems

Abdelhamid Salem, Leila Musavian

Published Jun 1, 2018• 2 citations
Publisher

Abstract

This paper analyzes the ergodic secrecy capacity of an energy-constrained multiple-antennas amplify-and-forward (AF) relaying system in the presence of a passive eavesdropper. In the first phase, the source broadcasts information signal, while the destination sends an artificial jamming signal. The jamming signal has two main purposes: 1) enhancing the system security; 2) increasing the energy harvesting (EH) at the relay node. In the second phase, the relay uses the harvested energy to amplify and forward the received signal to the destination. For this system model, explicit mathematical expressions for the ergodic secrecy capacity are derived for three different common EH-relaying protocols, namely, power splitting relaying (PSR), antenna selection and power splitting (ASPS) receiver, and ideal relaying receiver (IRR). Monte-Carlo simulations are included to validate the analysis and the effect of different parameters on the system security are investigated. The results show that, the ASPS receiver outperforms PSR in terms of secrecy capacity.

DOI
10.1109/iwcmc.2018.8450389

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The secrecy capacity (SC) from the source to a destination in a dual-hop amplify-and-forward (AF) relay network using cooperative jamming (CJ) is investigated. Conditions for achieving a positive SC are derived. An energy constrained untrusted cooperative relaying protocol is considered in which the relay forwards information from the source to the destination while harvesting energy from the source signal and the destination jamming signal. An optimization problem is proposed to maximize the SC subject to the energy constraints. A method is proposed to find the optimal power split ratio (PSR) which maximizes the SC. An approximate expression for the optimal PSR is also derived. Results show that a mutually beneficial relationship exists between source-destination pair and the relay. This allows the relay to achieve a net energy gain while the secrecy of the confidential message from the source to the destination is protected.
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In this paper, we proposed a generalized energy harvesting (GEH) protocol and utilized a non-linear energy harvesting (EH) model for AF Multi-Antenna Relaying Systems. In particular, the GEH protocol is a optimal EH protocol based on time switching relaying (TSR) and power splitting relaying (PSR) protocols. The whole communication process contains two phases. In phase I, the source transmits certain signal to the relay, meanwhile the destination transmits an artificial noise (AN) to interfere with the passive eavesdropper. The relay harvests energy from the two nodes. In phase II, the relay node processes the two different received signals, which are transmitted from the source and destination. Then the relay amplify-and-forward them by utilizing the harvested energy. To accurately reflect the non-linear nature of the practical EH circuit of GEH-based systems, we apply a special kind of quasi-concave function named logistic (sigmoidal) function to model the input-output characteristic. We also derive a new analytical formula for proposed generalized non-linear energy harvesting protocol on ergodic secrecy capacity. The effect of the number of relay antennas N, the source transmitted power Pthe destination transmitted power Pd on ergodic secrecy capacity are investigated. The simulation results show that as N, Ps, Pd increase, the ergodic secrecy capacity of GEH system increases accordingly. Moreover, the GEH protocol can provide higher non-linear ergodic secrecy capacity than time switching relaying (TSR) protocol and almost perform as better as power splitting relaying (PSR) protocol.