Abstract
In this chapter, a random frequency diverse array based directional modulation with artificial noise (RFDA-DM-AN) scheme is proposed to enhance physical layer security of wireless communications. Specifically, we first design the RFDA-DM-AN scheme by randomly allocating frequencies to transmit antennas, thereby achieving two-dimension (i.e., angle and range) secure transmissions, and outperforming the state-of-the-art one-dimensional (i.e., angle) phase array (PA)-based DM scheme. Then we derive the closed-form expression of a lower bound on the ergodic secrecy capacity (ESC) of our RFDA-DM-AN scheme. Based on the derived theoretical lower bound, we further optimize the transmission power allocation between the useful signal and artificial noise (AN) to improve the ESC. Simulation results show that (1) our RFDA-DM-AN scheme achieves a higher secrecy capacity than that of the PA-based DM scheme; (2) the lower bound derived is shown to approach the ESC as the number of transmit antennas N increases and precisely matches the ESC when N is sufficiently large; and (3) substantial performance gains can be achieved by the proposed method.
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Hu, J., Yan, S., Shu, F., Ng, D.W.K. (2021). Secure Transmission with Directional Modulation Based on Random Frequency Diverse Arrays. In: Le, K.N. (eds) Physical Layer Security. Springer, Cham. https://doi.org/10.1007/978-3-030-55366-1_2
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