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Optimal Transmit Beamforming for Secure SWIPT in a Two-Tier HetNet | IEEE Journals & Magazine | IEEE Xplore

Optimal Transmit Beamforming for Secure SWIPT in a Two-Tier HetNet


Abstract:

This letter investigates the artificial noise aided beamforming design for secure simultaneous wireless information and power transfer in a two-tier downlink heterogeneou...Show More

Abstract:

This letter investigates the artificial noise aided beamforming design for secure simultaneous wireless information and power transfer in a two-tier downlink heterogeneous network (HetNet), where one femtocell underlays one macrocell in co-channel deployment. Each energy receiver in femtocell can be considered as a potential eavesdropper for messages intended for information receiver (IR). Our objective is to maximize the secrecy rate at IR subject to the signal-to-interference-plus noise ratio requirements of macro users, transmit power constraint and energy harvesting constraint. Due to the non-convexity of the formulated problem, it cannot be solved directly. Thus, we propose a novel reformulation by using first-order Taylor expansion and successive convex approximation (SCA) techniques. Furthermore, an SCA-based algorithm with low complexity is proposed to arrive at provably convergent solution. Finally, numerical results evaluate the performance of the proposed algorithm.
Published in: IEEE Communications Letters ( Volume: 21, Issue: 11, November 2017)
Page(s): 2476 - 2479
Date of Publication: 01 August 2017

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