Combining MIMO beamforming with security codes to achieve unconditional communication security

Abstract

This paper investigated unconditional secure communications in a passive eavesdropping (PE)wireless environment via a two-step method under Wyner's model. Firstly, with MIMO transmit beamforming, one can utilize the spatial degree of freedom (DoF) to cripple eavesdroppers' interceptions even though the eavesdropper's CSI is unknown. Consequently, note that the legitimate receivers will still continue to enjoy an advantage channel over eavesdroppers when they share similar conditions (background noise power, channel gains), we approach Eve's optimal bit error rate bound as a bridge to unit the beamforming end with the security codes. Followed by such effective security code, the proposed system could achieve almost error-free transmissions for the main channel while zero information obtained by the eavesdroppers and the unconditional security system was built. We launched extensive experiments to verify the proposed security systems and demonstrated its feasibility and implement ability.