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To achieve a better effect of interference on eavesdropper with an enhancedsecurity, a secure precise jamming (PJ) and communication (SPJC) is proposedand its basic idea is to force the transmit energy of artificial noise (AN) andconfidential message into the neighborhoods of Eve and Bob by using randomsubcarrier selection (RSS), directional modulation, and beamforming under phasealignment (PA) constraint (PAC). Here, we propose two high-performancebeamforming schemes: minimum transmit power (Min-TP) and minimum regularizedtransmit power (Min-RTP) to achieve SPJC under PAC and orthogonal constraint(OC), where OC means that AN and CM are projected onto the null-spaces of thedesired and eavesdropping channels, respectively. Simulation results show thatthe proposed Min-TP and Min-RTP methods perform much better than existing equalamplitude (EA) method in terms of both bit-error-rate (BER) and secrecy rate(SR) at medium and high signal-to-noise ratio regions. The SR performancedifference between the proposed two methods becomes trivial as the number oftransmit antennas approaches large-scale. More importantly, we also find thefact that all three schemes including EA, Min-TP, and Min-RTP can form two mainpeaks of AN and CM around Eve and Bob, respectively. This achieves both PJ andsecure precise wireless transmission (SPWT), called SPJC.

Two Efficient Beamformers for Secure Precise Jamming and Communication with Phase Alignment