Improving Physical-Layer Security for Full-duplex Radio aided Two-Way Relay Networks

• Shenghua Zhai,
• Jianping An,

Vol. 14, No. 2, February 29, 2020
10.3837/tiis.2020.02.005, Download Paper (Free):

• full-duplex
• two-way relay network
• Physical-layer security
• power allocation

Abstract

The power allocation optimization problem is investigated for improving the physical-layer security in two-way relaying networks, where a full-duplex relay based half-jamming protocol (HJP-FDR) is considered. Specially, by introducing a power splitter factor, HJP-FDR divides the relay’s power into two parts: one for forwarding the sources' signals, the other for jamming. An optimization problem for power split factor is first developed, which is proved to be concave and closed-form solution is achieved. Moreover, we formulate a power allocation problem to determine the sources' power subject to the total power constraint. Applying the achieved closed-form solutions to the above-mentioned problems, a two-stage strategy is proposed to implement the overall power allocation. Simulation results highlight the effectiveness of our proposed algorithm and indicate the necessity of optimal power allocation.

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