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We propose a new artificial-noise aided hybrid time-switching/power-splittingscheme for orthogonal frequency-division multiplexing (OFDM) systems tosecurely transmit data and transfer energy to a legitimate receiving node. Inour proposed scheme, the cyclic prefix has two more benefits in addition to thecancellation of the inter-symbol interference between the OFDM blocks. Firstly,it enables the legitimate transmitter to send artificial-noise (AN) vectors ina way such that the interference can be canceled at the legitimate receiverprior to information decoding. Secondly, its power is used to energize thelegitimate receiver. We optimize the cyclic prefix length, the time-switchingand power-splitting parameters, and the power allocation ratio between the dataand AN signals at the legitimate transmitter to maximize the average secrecyrate subject to a constraint on the average energy transfer rate at thelegitimate receiver. Our numerical results demonstrate that our proposed schemecan achieve up to 23% average secrecy rate gain relative to a purepower-splitting scheme.

An Artificial-Noise-Aided Hybrid TS/PS Scheme for OFDM-Based SWIPT Systems