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In a directional modulation (DM) network, the issues of security and privacyhave taken on an increasingly important role. Since the power allocation ofconfidential message and artificial noise will make a constructive effect onthe system performance, it is important to jointly consider the relationshipbetween the beamforming vectors and the power allocation (PA) factors. Tomaximize the secrecy rate (SR), an alternating iterative structure (AIS)between the beamforming and PA is proposed. With only two or three iterations,it can rapidly converge to its rate ceil. Simulation results indicate that theSR performance of proposed AIS is much better than the null-space projection(NSP) based PA strategy in the medium and large signal-to-noise ratio (SNR)regions, especially when the number of antennas at the DM transmitter is small.

Energy-efficient Alternating Iterative Secure Structure of Maximizing Secrecy Rate for Directional Modulation Networks