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

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...

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Bibliographic Details
Published inIEEE communications letters Vol. 21; no. 11; pp. 2476 - 2479
Main Authors Li, Bin, Fei, Zesong, Chu, Zheng
Format Journal Article
LanguageEnglish
Published IEEE 01.11.2017
Subjects
Array signal processing
Communication system security
Erbium
HetNets
Interference
Macrocell networks
Receivers
second-order cone programming
secrecy rate
successive convex approximation
SWIPT
Wireless communication
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ISSN1089-7798
DOI10.1109/LCOMM.2017.2734759

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Summary: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.
ISSN:1089-7798
DOI:10.1109/LCOMM.2017.2734759