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Robust secrecy beamforming for full-duplex two-way relay networks under imperfect channel state information

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Abstract

Consider a two-way amplify-and-forward (AF) relay network where two legitimate nodes communicate through a relay in the presence of an eavesdropper. Assuming full duplexity at the legitimate nodes and the relay, a robust artificial noise (AN)-aided AF scheme is proposed to maximize the worst-case sum secrecy rate under imperfect channel state information (CSI) of the eavesdropper. This robust sum secrecy rate maximization (SSRM) problem is formulated as a max-min semi-infinite problem and is tackled by the semidefinite relaxation (SDR) method. In particular, we first convert the max-min semi-infinite problem into a maximization problem with a finite number of constraints. Then, an efficient two-block alternating difference-of-concave (DC) programming approach is proposed to iteratively solve the SDR problem, with one of the blocks computed in closed form. In addition, a specific robust rank-one solution construction procedure is presented to extract a feasible solution for the original robust SSRM problem from the SDR solution. The efficacy of the proposed method is demonstrated by numerical simulations.

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Acknowledgements

This work was supported by National Natural Science Foundation of China (Grant Nos. 61401073, 61531009).

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Authors and Affiliations

  1. National Key Laboratory of Science and Technology on Communications, University of Electronic Science and Technology of China, Chengdu, 611731, China

    Si Li & Shihai Shao

  2. School of Communication and Information Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China

    Qiang Li

Authors
  1. Si Li
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  2. Qiang Li
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  3. Shihai Shao
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Correspondence to Qiang Li.

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Li, S., Li, Q. & Shao, S. Robust secrecy beamforming for full-duplex two-way relay networks under imperfect channel state information. Sci. China Inf. Sci. 61, 022307 (2018). https://doi.org/10.1007/s11432-017-9110-x

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  • DOI: https://doi.org/10.1007/s11432-017-9110-x

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