Secure and Energy-Efficient Beamforming for Simultaneous Information and Energy Transfer

摘要: Some next-generation wireless networks will likely involve the energy-efficient transfer of information and energy over same channel. Moreover, densification such make physical layer more vulnerable to cyber attacks by potential multi-antenna eavesdroppers. To address these issues, this paper considers transmit time-switching (TS) mode, in which signals are transmitted separately time base station (BS). This protocol is not only easy implement but also delivers opportunity for multi-purpose beamforming, beamformers can be used jam eavesdroppers during power transfer. In presence imperfect channel estimation eavesdroppers, TS ratio jointly optimized maximize worst-case user secrecy rate subject constrained users’ harvested thresholds a BS budget. New robust path-following algorithms, one simple convex quadratic program at each iteration proposed computational solutions difficult optimization problem secure efficiency maximization. The latter adds further complexity due additional variables appearing denominator function. Numerical results confirm that performance against uncertainties.