Secure wireless energy harvesting-enabled AF-relaying SWIPT networks

Simultaneous wireless information and power transfer (SWIPT) has recently drawn much attention for its dual use of radio signals. A new type of relays, wireless energy harvesting (WEH)-enabled relays, are thus motivated to support cooperation. In this paper, we consider the use of power splitter (PS) at such relays for a distributed WEH-enabled amplify-and-forward (AF) relaying network, where a multi-antenna transmitter communicates with a single-antenna receiver with the aid of several single-antenna WEH-enabled AF relays, in the presence of a single-antenna eavesdropper. Assuming global channel state information (CSI) at the transmitter but local CSI from/to legitimate parties at the relays, the secrecy rate maximization problem is studied to optimize the beamforming vector at the transmitter as well as the PS ratios and the AF coefficients at the relays. We devise an efficient secure relay beamforming (SRB) algorithm to first obtain the PS ratios in a distributed manner and then iteratively adapt the transmit beam and the AF coefficients. The efficiency of the proposed algorithm is evaluated against other heuristic schemes by simulations.

[1]  Athina P. Petropulu,et al.  Uncoordinated Cooperative Jamming for Secret Communications , 2013, IEEE Transactions on Information Forensics and Security.

[2]  Abraham Charnes,et al.  Programming with linear fractional functionals , 1962 .

[3]  Kee Chaing Chua,et al.  Secrecy wireless information and power transfer with MISO beamforming , 2013, 2013 IEEE Global Communications Conference (GLOBECOM).

[4]  Mustafa Cenk Gursoy,et al.  Relay beamforming strategies for physical-layer security , 2010, 2010 44th Annual Conference on Information Sciences and Systems (CISS).

[5]  H. Vincent Poor,et al.  Power Allocation Strategies in Energy Harvesting Wireless Cooperative Networks , 2013, IEEE Transactions on Wireless Communications.

[6]  Rohit Negi,et al.  Guaranteeing Secrecy using Artificial Noise , 2008, IEEE Transactions on Wireless Communications.

[7]  Qiang Li,et al.  Cooperative Secure Beamforming for AF Relay Networks With Multiple Eavesdroppers , 2013, IEEE Signal Processing Letters.

[8]  Zhu Han,et al.  Improving Wireless Physical Layer Security via Cooperating Relays , 2010, IEEE Transactions on Signal Processing.

[9]  Derrick Wing Kwan Ng,et al.  Multi-objective beamforming for secure communication in systems with wireless information and power transfer , 2013, 2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC).

[10]  Kai-Kit Wong,et al.  Optimal Cooperative Jamming to Enhance Physical Layer Security Using Relays , 2011, IEEE Transactions on Signal Processing.

[11]  Charles R. Johnson,et al.  Matrix analysis , 1985, Statistical Inference for Engineers and Data Scientists.

[12]  Ali A. Nasir,et al.  Relaying Protocols for Wireless Energy Harvesting and Information Processing , 2012, IEEE Transactions on Wireless Communications.

[13]  Rui Zhang,et al.  MIMO Broadcasting for Simultaneous Wireless Information and Power Transfer , 2013 .

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