Detection of active eavesdropper in large scale planar arrays

Physical layer security(PLS) is efficient in providing security for wireless communications and in relaxing the complexity of the required cryptographic technologies. A PLS method, i.e. detection of active eavesdropper, using large scale planar arrays is proposed in this paper. The system is assumed to be time division duplex and the channels are of Rician distribution. The proposed method can effectively detect the active eavesdropper by assuming that the K-factor of the channel and the noise variance of the base station are known. Simulation results show that the performance of the proposed method is improved as the number of the antennas or the value of the K-factor is increasing. In addition, the performance of the proposed method is independent of the angle of the users.