A Dual-polarized Antennas Based Directional Modulation Scheme

In this paper, we proposed a novel directional polarization modulation (DPM) scheme based on dual-polarized antennas. This scheme can be applied in physical layer secure communication. By utilizing the direction-dependent characteristic of DPM, our scheme can protect signals in the legitimate direction, and simultaneously distort the constellation in other directions. Firstly, we discover the direction-dependent characteristic of DPM. Secondly, a dual-polarized dipole array design method is proposed to enhance the DPM's direction-dependent characteristic. Moreover, a method to precisely control the DPM's secure transmission direction is proposed. Finally, the simulations are carried out to verify the secure transmission performance.