Power-Efficient Artificial-Noise Optimization for Secure Multi-Beam Wireless Communication

Transmit Beamforming and artificial noise (AN) methods have been widely employed to achieve wireless physical layer (PHY) secure transmissions. At present, most of the work is focused on optimizing transmit beamforming, with relatively little emphasis on the design of artificial noise projection matrix (ANPM). In this paper, compared with traditional ANPM obtained by zero-forcing method, which lacks efficiency and rationality for AN power distribution. This paper aims to prevent known eavesdroppers intercepting useful signal as far as possible and achieve a narrower bit error rate (BER) main beamwidth under the premise of limited AN power consumption. The distribution of AN power in all directions is optimized by minimizing the AN transmit power subject to a series of SINR constraints. Finally, simulation results Eves can be seriously affected by the AN with regard to power efficiency performance.