Magnetic Resonant Beamforming for Secured Wireless Power Transfer

Magnetic resonance coupling (MRC) has been utilized in wireless power transfer (WPT) to achieve mid-range contactless power supply. However, unintended users might also draw power from the transmission devices. In this letter, an MRC-WPT system with multiple power transmitters, one intended power receiver, and one unintended power receiver is investigated. We formulate a power security problem by limiting the unintended receiving power and, at the same time, maximizing the power of the intended user. Such an optimization problem is in general nonconvex. Nevertheless, a global optimal solution can be efficiently achieved with the aid of semidefinite relaxation approach. Simulation results are provided to demonstrate the effectiveness of the proposed algorithm.

[1]  Stephen P. Boyd,et al.  Disciplined Convex Programming , 2006 .

[2]  James W. Nilsson,et al.  Electric Circuits , 1983 .

[3]  Milan M. Jovanovic,et al.  A contactless electrical energy transmission system for portable-telephone battery chargers , 2003, IEEE Trans. Ind. Electron..

[4]  Rui Zhang,et al.  Multiuser charging control in wireless power transfer via magnetic resonant coupling , 2015, 2015 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP).

[5]  Victor C. M. Leung,et al.  Wireless energy harvesting in interference alignment networks , 2015, IEEE Communications Magazine.

[6]  Luke Collins,et al.  Cut the cord , 2008 .

[7]  Hongbo Zhu,et al.  Noncoherent Detections for Ambient Backscatter System , 2017, IEEE Transactions on Wireless Communications.

[8]  Feifei Gao,et al.  Joint Information- and Jamming-Beamforming for Physical Layer Security With Full Duplex Base Station , 2014, IEEE Transactions on Signal Processing.

[9]  Tao Zhang,et al.  Physical-Layer Security for Full Duplex Communications With Self-Interference Mitigation , 2016, IEEE Transactions on Wireless Communications.

[10]  Rui Zhang,et al.  Magnetic beamforming for wireless power transfer , 2016, 2016 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP).

[11]  William C. Brown,et al.  The History of Power Transmission by Radio Waves , 1984 .

[12]  H. M. Trueblood,et al.  Co-ordination of power and communication circuits for low-frequency induction , 1940, Electrical Engineering.

[13]  S.C. Goldstein,et al.  Magnetic Resonant Coupling As a Potential Means for Wireless Power Transfer to Multiple Small Receivers , 2009, IEEE Transactions on Power Electronics.

[14]  Stephen P. Boyd,et al.  Convex Optimization , 2004, Algorithms and Theory of Computation Handbook.

[15]  M. Soljačić,et al.  Wireless Power Transfer via Strongly Coupled Magnetic Resonances , 2007, Science.

[16]  Dina Katabi,et al.  Magnetic MIMO: how to charge your phone in your pocket , 2014, MobiCom.

[17]  Chintha Tellambura,et al.  Ambient Backscatter Communication Systems: Detection and Performance Analysis , 2016, IEEE Transactions on Communications.

[18]  Victor C. M. Leung,et al.  Opportunistic communications in interference alignment networks with wireless power transfer , 2015, IEEE Wireless Communications.