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SCIENCE CHINA Information Sciences, Volume 61, Issue 2: 022307(2018) https://doi.org/10.1007/s11432-017-9110-x

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

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  • ReceivedApr 1, 2017
  • AcceptedMay 4, 2017
  • PublishedSep 22, 2017

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.


Acknowledgment

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


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