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In this paper, we consider simultaneous wireless information and powertransfer (SWIPT) in orthogonal frequency division multiple access (OFDMA)systems with the coexistence of information receivers (IRs) and energyreceivers (ERs). The IRs are served with best-effort secrecy data and the ERsharvest energy with minimum required harvested power. To enhance physical-layersecurity and yet satisfy energy harvesting requirements, we introduce a newfrequency-domain artificial noise based approach. We study the optimal resourceallocation for the weighted sum secrecy rate maximization via transmit powerand subcarrier allocation. The considered problem is non-convex, while wepropose an efficient algorithm for solving it based on Lagrange duality method.Simulation results illustrate the effectiveness of the proposed algorithm ascompared against other heuristic schemes.

Joint Secure Beamforming for Cognitive Radio Networks with Untrusted Secondary Users