Secrecy Wireless Information and Power Transfer With MISO Beamforming

• Published in: IEEE transactions on signal processing Vol. 62; no. 7; pp. 1850 - 1863
• Main Authors: Liu, Liang, Zhang, Rui, Chua, Kee-Chaing
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.04.2014; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Array signal processing; artificial noise; Beamforming; Channels; Communication system security; Detection, estimation, filtering, equalization, prediction; energy harvesting; Energy transmission; Exact sciences and technology; Heuristic; Information, signal and communications theory; Optimization; physical layer security; power control; Power transfer; Receivers; Receivers & amplifiers; Searching; semi definite relaxation (SDR); Signal and communications theory; Signal to noise ratio; Signal, noise; Simultaneous wireless information and power transfer (SWIPT); Telecommunications and information theory; Transmitters; Vectors; Wireless communication; wireless power; Wireless telecommunication; Transmitter; Wireless electricity; Power allocation; Beam forming; Relaxation; Safety; MISO system; Multiple access; artificial noise; Multistage method; Radio wave; semi-definite relaxation (SDR); energy harvesting; Simultaneous wireless information and power transfer (SWIPT); Transmitting antenna; Power control; wireless power; One dimensional model; Telecommunication channels; Signal processing; physical layer security; Signal to interference plus noise ratio; beamforming; Secrecy; Software radio
• ISSN: 1053-587X; 1941-0476
• DOI: 10.1109/TSP.2014.2303422

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.