Physical layer security based on artificial noise and spatial modulation

Due to the broadcast nature, wireless transmissions can be overheard by any receiver within the transmission range. To prevent eavesdropping in a multiple-input single-output (MISO) system, a physical layer security scheme called secure unitary coded spatial modulation (UC-SM) is proposed in this paper. The proposed secure UC-SM scheme can achieve a second-order transmit diversity by using a single radio frequency (RF) chain. Artificial noise (AN) is introduced to deteriorate the performance of eavesdropper while the desired node is not affected. Simulation results show that, the proposed scheme not only maintains the advantages of the original SM technique, but also outperforms the existing secure SM scheme.