A Hybrid PSO-GA Algorithm Based Directional Modulation Technique

Directional Modulation (DM) technique, as a promising mean to secure wireless communication, has been attracting increasing attention in recent ten years. The baseband modulation signal is synthesized at the antenna level for maintaining the standard constellation format along the prescribed direction while simultaneously distorting the signal constellation in other directions. In this paper, we present a novel phased DM signal synthesis method using an improved hybrid algorithm, which takes advantages of both genetic algorithm (GA) and particle swarm optimization (PSO) algorithm. The proposed DM signal has a narrower information beam-width, so it offers a better physical layer secure performance compared with the GA or PSO optimized directional modulation signal. Simulation results validate the proposed synthesis approach.

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