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A synthesis approach of direct antenna modulation for secure ship satellite communication

机译：安全船卫星通信直接天线调制的合成方法

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摘要

Communication security is a critical and increasingly challenging issue in wireless networks. Signals have the risk of being intercepted in traditional wireless communication because of the wireless propagation characteristics. There is also the same problem for ship satellite communication. The direct antenna modulation (DAM) is a promising secure communication technique, which scrambles signals in unwanted transmit spatial directions and can be implemented by phased array. As the DAM system model is established for the line of sight(LOS) propagation, it can also be applied to ship satellite communication. A two-dimension model is established in this paper. It is assumed that the DAM transmitter is mounted in the geostationary satellite. Usually, we expect that the legitimate receiver in the cooperative ship has a good demodulation performance while the illegitimate receiver in other places can hardly decrypt the data symbols correctly. A synthesis approach of direct phased array modulation based on NSGA-II algorithm is proposed in this paper. With the knowledge of legitimate and illegitimate receiver's directions, appropriate phase shifts can be synthesized for the secure communication scene mentioned above. In addition, a random phase shifts selection structure of direct antenna modulation transmitter based on this synthesis approach is also presented. Simulations are conducted to validate the effectiveness of the proposed approach in the end.
机译：通信安全是无线网络中的一个关键且越来越具有挑战性的问题。由于无线传播特性，信号具有传统无线通信中被截取的风险。船舶卫星通信也存在同样的问题。直接天线调制（DAM）是一个有希望的安全通信技术，其在不需要的发射空间方向上加扰信号，并且可以通过相控阵列实现。随着坝系统模型的建立为视线（LOS）传播，也可以应用于船舶卫星通信。本文建立了两维模型。假设坝发射器安装在地静止卫星中。通常，我们预期，合作船中的合法接收器具有良好的解调性能，而其他地方的非法接收器可以正确地解密数据符号。本文提出了一种基于NSGA-II算法的直接相控阵调制的合成方法。随着合法和非法接收者的方向的知识，可以为上述安全通信场景合成适当的相移。另外，还介绍了基于该合成方法的直接天线调制发射器的随机相移选择结构。进行仿真以验证拟议方法的有效性。

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