Low-Complexity Joint Phase Adjustment and Receive Beamforming for Directional Modulation Networks via IRS

Intelligent reflecting surface (IRS) is a revolutionary and low-cost technology for boosting the spectrum energy efficiencies in future wireless communication network. In order to create controllable multipath transmission conventional line-of-sight (LOS) environment, an IRS-aided directional modulation (DM) network considered. this paper, improve security of system maximize receive power sum (Max-RPS), two alternately optimizing schemes jointly designing beamforming (RBF) vectors IRS phase shift matrix (PSM) are proposed: Max-RPS using general alternating optimization (Max-RPS-GAO) algorithm zero-forcing (Max-RPS-ZF) algorithm. Simulation results show that, compared with no-IRS-assisted scheme no-PSM scheme, proposed IRS-assisted Max-RPS-GAO method Max-RPS-ZF can significantly secrecy rate (SR) performance DM system. Moreover, method, has faster convergence speed certain lower computational complexity.