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A multiple-input single-output cognitive radio downlink network is studiedwith simultaneous wireless information and power transfer. In this network, asecondary user coexists with multiple primary users and multiple energyharvesting receivers. In order to guarantee secure communication and energyharvesting, the problem of robust secure artificial noise-aided beamforming andpower splitting design is investigated under imperfect channel stateinformation. Specifically, the max-min fairness energy harvesting problem isformulated under the bounded channel state information error model. Aone-dimensional search algorithm based on ${\cal S}\text{-Procedure} $ isproposed to solve the problem. It is shown that the optimal robust securebeamforming can be achieved. A tradeoff is elucidated between the secrecy rateof the secondary user receiver and the energy harvested by the energyharvesting receivers under a max-min fairness criterion.

Robust Max-Min Fairness Energy Harvesting in Secure MISO Cognitive Radio With SWIPT