Intelligent Reflecting Surface Assisted Secrecy Communication via Joint Beamforming and Jamming
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In this letter, we investigate an intelligent reflecting surface (IRS) assisted wireless secrecy communication system, where an IRS is deployed nearby a single-antenna receiver to assist in the secure transmission from a multi-antenna transmitter, in the presence of multiple single-antenna eavesdroppers. Aiming to maximize the achievable secrecy rate, a design problem for jointly optimizing transmit beamforming with jamming and IRS reflect beamforming is formulated, which is however difficult to solve due to its non-convexity and coupled variables. We thus propose an efficient algorithm based on alternating optimization to solve the problem sub-optimally. Simulation results show that incorporating jamming with artificial noise (AN) in transmit beamforming is generally beneficial to improve the secrecy rate, even under the new setup with IRS reflect beamforming.
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