Physical Layer Secure Communication Using Orbital Angular Momentum Transmitter and a Single-Antenna Receiver
Physical Layer Secure Communication Using Orbital Angular Momentum Transmitter and a Single-Antenna Receiver
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DOI：
10.1109/tap.2020.2981732
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发表时间：
2020-07-01
影响因子：
5.7
通讯作者：
Malyuskin, Oleksandr
中科院分区：
文献类型：
--
作者：
Abbasi, Muhammad Ali Babar;Fusco, Vincent;Malyuskin, Oleksandr
用于无线电通信的轨道角动量（OAM）具有以相同频率和时间资源同时发射多个信号的潜力。这通过增加同时数据流的可用数量来倍增给定带宽下可实现的信道容量。OAM无线电通信的一个缺点是在链路的两端需要多模射频（RF）硬件，即，发送器和接收器。这并不总是实际可行的，特别是当我们在未来的通信设备中转向低轮廓接收器时。在这项工作中，我们提出了一种新的方法，OAM为基础的无线电通信增强物理层的安全性，只需要一个单天线接收器。我们首先介绍了系统的结构，然后我们设计并实现了一个基于罗特曼透镜的圆形天线阵列发射机工作在5.8 GHz。然后，我们通过实验验证硬件创建多种模式的能力。作为概念验证，我们提出了一种同时使用OAM波束形成器的模式0和+1的通信系统，并在此过程中展示了如何使用单天线接收器进行数据恢复。我们首先确定一个通用的模拟调制表达式，并使用建议的系统发送数字调制的数据流到一个单天线装备的接收机。需要一个预通信训练序列来实现所提出的方法。实验结果验证了模拟预测。
Orbital angular momentum (OAM) for radio communications has the potential of simultaneously transmitting multiple signals at the same frequency and time resources. This multiplies the achievable channel capacity at a given bandwidth by increasing the available number of simultaneous data streams. One downside of OAM radio communication is the requirement of multimode radio frequency (RF) hardware at both ends of a link, i.e., the transmitter and the receiver. This is not always practically viable, especially as we move toward low-profile receivers in future communication devices. In this work, we present a novel method of OAM-based radio communication with enhanced physical layer security that requires only a single-antenna receiver. We first present the system architecture, then we design and realize a Rotman lens-based circular antenna array transmitter operating at 5.8 GHz. We then experimentally verify the capability of the hardware to create multiple modes. As a proof-of-concept, we propose a communication system that simultaneously uses modes 0 and +1 of the OAM beamformer and in doing so show how a single-antenna receiver can be used for data recovery. We first identify a general analog modulation expression and use the proposed system to transmit digitally modulated data stream to a single-antenna-equipped receiver. A precommunication training sequence is required to realize the proposed approach. The experimental results verify the simulated predictions.