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

Bin Li, Zesong Fei, Zheng Chu

Research output: Journal PublicationArticlepeer-review

30 Citations (Scopus)


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.

Original languageEnglish
Article number7999236
Pages (from-to)2476-2479
Number of pages4
JournalIEEE Communications Letters
Issue number11
Publication statusPublished - Nov 2017
Externally publishedYes


  • HetNets
  • second-order cone programming
  • secrecy rate
  • successive convex approximation

ASJC Scopus subject areas

  • Modelling and Simulation
  • Computer Science Applications
  • Electrical and Electronic Engineering


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