access icon free Secure resource allocation for green two-way relay networks with mutually untrusted relay and mobile users

© The Institution of Engineering and Technology
Received 08/01/2019, Accepted 13/08/2019, Revised 04/07/2019, Published 16/08/2019

The authors investigate secure resource allocation for an orthogonal frequency division multiple access two-way relay network, which has several pairs of mobile users (MUs) and one energy harvesting (EH) relay. In this network, the relay is untrusted and each MU pair may also overhear the other MU pairs’ confidential information. In particular, to forward information for each MU, the relay adopts power splitting technique to harvest energy from radio frequency signals emitted by each MU. For this scenario, which has hardly been considered, the joint problem of subcarrier allocation, power control, and power splitting ratio selection is formulated, with the aim to maximise the total secrecy rate of all MUs. A suboptimal algorithm with low complexity and satisfactory performance is proposed to solve the formulated non-convex problem.

Inspec keywords: concave programming; frequency division multiple access; OFDM modulation; energy harvesting; power control; telecommunication control; resource allocation; relay networks (telecommunication); telecommunication power management; telecommunication security

Other keywords: power control; secure resource allocation; radio frequency signals; green two-way relay networks; suboptimal algorithm; subcarrier allocation; power splitting ratio selection; MU pair confidential information; energy harvesting relay; mutually untrusted relay; orthogonal frequency division multiple access two-way relay network; power splitting technique; nonconvex problem; mobile users

Subjects: Power and energy control; Control applications in radio and radar; Optimisation techniques; Energy harvesting; Telecommunication systems (energy utilisation); Energy harvesting; Optimisation techniques; Radio links and equipment; Modulation and coding methods; Multiple access communication

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