Secrecy wireless information and power transfer with MISO beamforming

Liang Liu, Rui Zhang, Kee Chaing Chua

Research output: Journal article publicationJournal articleAcademic researchpeer-review

364 Citations (Scopus)


The dual use of radio signal for simultaneous wireless information and power transfer (SWIPT) has recently drawn significant attention. To meet the practical requirement that the energy receiver (ER) operates with significantly higher received power as compared to the conventional information receiver (IR), ERs need to be deployed in more proximity to the transmitter than IRs in the SWIPT system. However, due to the broadcast nature of wireless channels, one critical issue arises that the messages sent to IRs can be eavesdropped by ERs, which possess better channels from the transmitter. In this paper, we address this new physical-layer security problem in a multiuser multiple-input single-output (MISO) SWIPT system where one multi-antenna transmitter sends information and energy simultaneously to an IR and multiple ERs, each with one single antenna. Two problems are investigated with different practical aims: the first problem maximizes the secrecy rate for the IR subject to individual harvested energy constraints of ERs, while the second problem maximizes the weighted sum-energy transferred to ERs subject to a secrecy rate constraint for IR. We solve these two non-convex problems optimally by a general two-stage procedure. First, by fixing the signal-to-interference-plus-noise ratio (SINR) target for ERs or IR, we obtain the optimal transmit beamforming and power allocation solution by applying the technique of semidefinite relaxation (SDR). Then, each of the two problems is solved by a one-dimension search over the optimal SINR target for ERs or IR. Furthermore, for each problem, suboptimal solutions of lower complexity are proposed.

Original languageEnglish
Article number6728676
Pages (from-to)1850-1863
Number of pages14
JournalIEEE Transactions on Signal Processing
Issue number7
Publication statusPublished - 1 Apr 2014
Externally publishedYes


  • artificial noise
  • beamforming
  • energy harvesting
  • physical layer security
  • power control
  • semi definite relaxation (SDR)
  • Simultaneous wireless information and power transfer (SWIPT)
  • wireless power

ASJC Scopus subject areas

  • Signal Processing
  • Electrical and Electronic Engineering


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