基于人工噪声的直接天线调制信号综合方法

Artificial-noise Based Synthesis Method for Secure Direct Antenna Modulation

直接天线调制(Direct Antenna Modulation,DAM)信号能够用于视距通信系统以实现与指定方向上合作用户的安全通信。传统基于遗传算法的直接天线调制信号综合方法需要反复迭代来逼近最优值,灵活性不高并且很难得到完全理想的信号星座。本文提出了基于人工噪声的直接天线调制信号综合方法,将随机产生的人工噪声加入到期望方向指向向量的零空间中,使得期望方向上收到的是标准的信号星座,其他方向上收到的是畸变的信号星座。相比传统方法,所提方法灵活性高,并且可以在合作方向上得到理想的信号星座。

Direct antenna modulation(DAM)can be applied to line-of-sight systems to achieve secure communication with cooperative users in desired directions.The traditional synthesis method of DAM signal based on genetic algorithm needs repeated iterations to approximate the optimal value.It is not flexible and difficult to obtain a perfect signal constellation.In this paper,a synthesis method of DAM signal based on the artificial noise is proposed.The random artificial noise is added to the zero space of steering vector of the desired direction.Standard signal constellations can be received in desired directions while distorted signal constellations are received in other directions.Compared with the traditional method,the proposed method is more flexible and can obtain ideal signal constellations in cooperative directions.