Wireless Powered Large-Scale Multi-Antenna AF Relaying for Cooperative Jamming-Aided Secrecy

摘要

This paper studies the secrecy transmission withthe aid of a large-scale multi-antenna amplify-and-forward (AF)relay wireless powered by the source. Specifically, the wirelessenergy harvesting (WEH)-enabled relay devices a hybrid receiverarchitecture, in which the received power at each individualantenna is split for energy harvesting (EH) and informationreceiving (IR) in the first transmission phase; the aggregate of thetotal harvested power is further split for cooperative jamming(CJ) to confound the eavesdroppers, and AF using maximumratio combining (MRC) and maximum ratio transmitting (MRT),respectively, at the relay in the second transmission phase.Assuming that the eavesdroppers in the proximity are distributedas Poisson point process (PPP), no channel state information(CSI) but the density of which is known to the relay, theergodic secrecy rate (ESR) is used to characterize the secrecyperformance. The optimum portion of power allocated for CJ isalso derived to significantly improve on the ESR especially in thecase of high eavesdroppers’ density.