基于多目标遗传模拟退火算法的方向调制

为实现对自由空间中任意期望方向的物理层安全通信,提出了一种运用多目标函数遗传模拟退火算法的方向调制方法.文中建立以通信信号误码性能和星座图畸变程度为指标的2个遗传目标函数,并结合模拟退火算法以避免遗传算法易陷入局部最优,使得发射信号在合法用户方向与期望星座图相同,而窃听用户方向上星座图产生极大程度的畸变.仿真结果表明:所提方向调制方法与现有基于遗传算法、粒子群算法、多目标遗传算法方向调制方法相比,具有更窄的误码率波束宽度,所提出的多目标方向调制物理层安全通信信号具有更强的防窃听性能.

A Directional Modulation Method Based on Multi-Objective Genetic Simulated Annealing Algorithm

In order to realize the secure communication of physical layer in any desired direction in free space, a directional modulation method is proposed based on multi objective function genetic simulated annealing algorithm. In this paper, two genetic objective functions are established based on the BER performance of communication signals and the degree of constellation distortion in combination with simulated annealing algorithm to avoid genetic algorithm from falling into local optimum. The transmitted signal is the same as the expected constellation in the legal user direction, while the constellation map in the eavesdropping user direction produces a great degree of distortion. The simulation results show that the directional modulation method proposed is narrower in BER beam width compared with the existing directional modulation methods, genetic algorithm, particle swarm algorithm and multi objective genetic algorithm. The proposed multi target directional modulation physical layer secure communication signal has stronger anti eavesdropping performance.