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http://dx.doi.org/10.3837/tiis.2020.02.005

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

Zhai, Shenghua (School of Information and Electronics, Beijing Institute of Technology)
An, Jianping (School of Information and Electronics, Beijing Institute of Technology)
Publication Information
KSII Transactions on Internet and Information Systems (TIIS) / v.14, no.2, 2020 , pp. 562-576 More about this Journal
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.
Keywords
Full-duplex; Two-way relay network; Physical-layer security; Power allocation;
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