DM using FDA antenna for secure transmission

Abstract

This study proposes a range- and angle-dependent directional modulation (DM) scheme using frequency diverse array (FDA) for secure wireless communications. It uses uniform element spacing and symmetrically and non-linearly increasing frequency increments to decouple range- and angle-dependent transmit beampattern for the uniform FDA and DM techniques for secure signal transmission. The transmitted signal symbols are purposely distorted to be unrecoverable at unintended positions, but they could be recovered successfully at the intended position. The proposed method is evaluated by examining the signal-to-noise ratio, detection probability, and bit error rate. Numerical results show that the symmetrical FDA-based method outperforms both the phased-array-based method and the standard FDA-based method in security performance for wireless communications.