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In this paper, a practical wireless transmission scheme is proposed totransmit confidential messages to the desired user securely and precisely bythe joint use of multiple techniques including artificial noise (AN)projection, phase alignment (PA)/beamforming, and random subcarrier selection(RSCS) based on OFDM, and directional modulation (DM), namely RSCS-OFDM-DM.This RSCS-OFDM-DM scheme provides an extremely low-complexity structures forthe transmitter and desired receiver and makes the secure and precise wirelesstransmission realizable in practice. For illegal eavesdroppers, the receivepower of confidential messages is so weak that their receivers cannot interceptthese confidential messages successfully once it is corrupted by AN. In such ascheme, the design of phase alignment/beamforming vector and AN projectionmatrix depend intimately on the desired direction angle and distance. It isparticularly noted that the use of RSCS leads to a significant outcome that thereceive power of confidential messages mainly concentrates on the smallneighboring region around the desired receiver and only small fraction of itspower leaks out to the remaining large broad regions. This concept is calledsecure precise transmission. The probability density function of real-timereceive signal-to-interference-and-noise ratio (SINR) is derived. Also, theaverage SINR and its tight upper bound are attained. The approximateclosed-form expression for average secrecy rate is derived by analyzing thefirst-null positions of SINR and clarifying the wiretap region.

Secure Precise Wireless Transmission with Random-Subcarrier-Selection-based Directional Modulation Transmit Antenna Array