A second-order spatial hopping transmission scheme for physical layer security

The method of physical layer security in wireless relay communication based on cooperative jamming scheme need the channel of legitimate user keep constant. It fails if the eavesdropper has more antennas than the sender. To solve this problem, this paper proposes a second-order spatial hopping transmission scheme. The sender, by the antenna switching and the hopping spatial pattern (HSP), forms equivalent spatial channel of the first-order; Acting as a virtual multi-antenna receivers, relays use time-varying coefficient of beam-forming to weighted-and-forward, form equivalent spatial channel of the second-order. Simulation results show that the scheme proposed achieves low probability of intercept (LPI) in eavesdropper and the power consumption is lower than the method of cooperative jamming.