Secrecy capacity for MIMO fading channel with size-limited eavesdropper

In the multiple input multiple output (MIMO) wiretap channel model which contains path loss, shadow fading and small-scale fading, we consider the effect of both spatial correlation and antenna mutual coupling, with limited size of eavesdropper which has Multi-antenna. Via Monte Carlo simulation, we analyze the effect on secrecy capacity when the location of the transmitter and the eavesdropper changes relatively, under the situation that the number of antennas of the eavesdropper is greater than the legitimate receiver's. The simulation results show that, based on different status of the wiretap channels, a corresponding safety distance between the transmitter and the eavesdropper should be calculated to ensure the system security.