Sum Secrecy Rate Maximization for Relay-Aided Multiple-Source Multiple-Destination Networks

This paper studies a multiple-source multiple-destination network with the presence of multiple eavesdroppers, in which an amplify-and-forward (AF) relay is used to bridge the communication between the source–destination pairs to overcome the long-distance attenuation. Considering the physical-layer security issues, the authors aim to maximize the sum secrecy rate subject to the relay power constraint and the quality-of-service (QoS) requirements for legitimate user equipment. First, the authors propose an algorithm based on the monotonic optimization and the semidefinite programming (MO-SDP). Simulation results show that the authors' proposed MO-SDP algorithm exhibits almost the same performance as the optimal solution. To alleviate the problem of high complexity associated with the MO-SDP algorithm, the authors then propose an alternative solution based on the null-space (NuS) relay precoding, the complexity of which is significantly reduced, and it yields a semiclosed-form expression for the solution. Moreover, the performance of the proposed NuS algorithm is evaluated via simulations, and the performance of the NuS algorithm and that of the MO-SDP algorithm are shown to converge at the high signal-to-noise ratio (SNR) region.

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  • English

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  • Accession Number: 01638377
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 18 2017 1:49PM