Security method of wireless physical layer security based onmultipath channel random delay
基于多径信道随机延时的物理层全算法

For the wire-tapping in wireless communication system, this paper presented an encrypting method based on channel multipath delay-time information to ensure the security of physical layer in wireless communication system. In this method, the transmitter made the time to transmit symbol random with channel multipath delay-time information that estimated, and made the received signal of legitimate receiver stronger at the synchronization location. So the legitimate could receive the information normally. While the received signal of eavesdropper turned random for different channel information, such as phase and range. Then the eavesdropper couldn't recover the information with the random received signal, and the error probability was high, which increased the security of legitimate receiver. The simulations show that the method can keep the eavesdropper's error probability at a high level, so as to increase the system security. Finally, it comes to the conclusion that this method can ensure the security of physical layer in wireless communication system with channel multipath.