关键词: 放大转发中继, 保密通信, 零空间波束形成, 无线能量收集, 功率分配

Abstract: We research on cooperative information security transmitting using energy harvest amplify-and-forward relay in the wireless information and power transfer network with multiple eavesdroppers.Two low-complexity methods using zero-space beaforming technique are proposed.Using the prior location information of receiver or eavesdroppers,our methods project the target vector to the zero space of receiver or eavesdroppers.Computational complexity of the method is lower than that of classical method since space freedom of the target vector is reduced.Furthermore,second method induces the eavesdropper's mutual information of objective function to be zero,the original quasi-convex problem is transformed into a convex form.Thus,computational complexity of the method is apparently reduced compared with that of classical method.Result of experiment verify validity of our proposed methods.

Key words: amplify-and-forward relay, secrecy communication, zero-space beamforming, wireless energy harvesting, power splitting