Secure Spatial Modulation Based on Artificial Noise

A secure spatial modulation based on artificial noise (AN-SM) is proposed. Different from the traditional spatial modulation schemes, the legitimate channel state information is utilized to convey part of information bits instead of amplitude phase modulation (APM) constellation. By this way, the normal transmit signals will become artificial noise to the eavesdropper, and it is impossible for the eavesdropper to know the legitimate channel state information. Consequently, the secrecy transmission could be achieved. Moreover, all transmit power is used to transmit the legitimate signals without any energy waste. The secrecy rate is analyzed, and the numerical results show that the new AN-SM scheme could achieve high secrecy rate.