The invention discloses a
physical layer safety transmission method used for an SIMO
wireless communication
system. Firstly, a receiving expecting party emits a random reference
signal reversely, an emitting party scrambles and transmits symbols to be transmitted through the received reference
signal, and finally the receiving expecting party demodulates the received
signal through the known reference signal to obtain information transmitted by the emitting party. In the first step, the multi-antenna receiving party sends not only the reference signal, but also an
artificial noise signal, the space where the
artificial noise signal is located is in quadrature with a
main channel vector, so that the
artificial noise has no influence on receiving the reference signal of the emitting expecting party. For an eavesdropper, due to different channels,
eavesdropping is interfered with by artificial
noise signals, the random reference signal is difficult to evaluate accurately, the probability of successfully
eavesdropping encrypted signals is greatly reduced, and safety transmission of the SIMO
wireless communication
system is guaranteed finally.