Time-modulated FDA for physical-layer security

Time-modulated FDA for physical-layer security
复制标题

用于物理层安全的时间调制 FDA

DOI:
10.1049/iet-map.2016.0930
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发表时间:
2017-08
期刊:
IET Microwaves, Antennas & Propagation
影响因子:
--
通讯作者:
Jie Xiong
Jie Xiong
中科院分区:
其他
文献类型:
--
作者:
Shaddrack Yaw Nusenu;Wen-Qin Wang;Jie Xiong

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在这项研究中,作者通过将时间调制阵列(TMA)和 FDA 相结合,提出了一种时间调制频率多样化阵列(FDA),以实现物理层安全。所提出的方案有两个方面:首先,信息代码是专门为 FDA 元件交替切换而设计的,它产生指定的方向模式,将相位调制信号投影为所需范围-角度部分中的星座,同时在其他区域中失真。其次,根据与发射信号相关的扩频序列和期望的接收器位置,为TMA调整切换方案。在这种方式下,只有位于预先指定的距离-角度位置的接收器才能成功解调接收到的信号,而辐射到其他不期望的距离-角度位置的失真信号将很难被窃听者解调,即使知道扩频序列。数值结果表明,由于距离与角度相关的特性,该方法提供了更安全的传输性能,并且优于传统的基于相控阵的定向调制方法。
In this study, the authors propose a time-modulated frequency diverse array (FDA) by combining time-modulated array (TMA) and FDA for physical-layer security. The proposed scheme has two-folds: first, the information codes are specifically designed for the FDA elements switching alternatively, which produces a specified directional pattern projecting the phase-modulation signal as a constellation in the desired range–angle section while distorting in other areas. Second, a switching scheme is adapted for the TMA according to the spreading sequence associated with the transmitted signal and the desired receiver position. In such a fashion, only the receiver located at the pre-specified range–angle position can demodulate the received signal successfully but the distorted signals radiated to other undesired range–angle positions will be difficult to demodulate by the eavesdroppers even if with the knowledge of the spread sequence. Numerical results show that, due to the range–angle-dependent characteristics, the proposed method offers more secure transmission performance and outperforms the traditional phased-array-based directional modulation method.
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