Abstract:

The artificial noise (AN) assisted strategy is invalid to guarantee physical layer security of wireless comunication. The opposite of AN-assisted strategy is investigated only for the sIngle user case. Aiming at this, two wiretapping methods are proposed for ANassisted multiuser multiple-input multiple-output (MUMIMO) system. Firstly, the idea of wiretapping based on blind source separation (BSS) is expounded by the contrast analysis of the AN-assisted MU-MIMO system model and the BSS linear structure. Then, two novel wiretapping algorithms are put forward. The permutation indetermination of secret message is removed through setting limits on the separation matrix and nonlinear function structure, and the phase ambiguity is reduced by the separation matrix normalization. Simulation results show that both of our proposed methods can intercept information effectively with a low computational complexity. In addition, the more antennas eavesdropper equipped the better average BER.