基带
计算机科学
量化(信号处理)
电子工程
高斯噪声
调制(音乐)
噪音(视频)
辐射模式
带宽(计算)
高斯分布
声学
控制理论(社会学)
光学
拓扑(电路)
物理
算法
电信
电气工程
工程类
天线(收音机)
控制(管理)
量子力学
人工智能
图像(数学)
作者
Qianwei Zeng,Peng Yang,Lu Yin,Yunying Man,Feng Yang,Tao Dong,Shiwen Yang
标识
DOI:10.1109/tap.2023.3303576
摘要
A novel dynamic distributed time-modulated array (DD-TMA) that uses 2-bit phase control for continuous beam scanning directional modulation (DM) is presented. The element positions of the DD-TMA change randomly and can be easily implemented by using single pole double throw (SPDT) switches and redundant elements. The position of each array element follows a Bernoulli distribution, resulting in a radiation far-field of the TMA being described by a Gaussian distribution. Theoretical analysis of the statistical model shows that the TMA signal is made up of two components: the first accurately carries baseband information related to the mean pattern, while the second introduces artificial noise whose power corresponds to the variance of the radiation far-field. This noise could prevent eavesdroppers, situated in any direction besides the desired receiver, from effectively intercepting the transmitted data. An approach to prevent DM performance degradation due to phase quantization errors is introduced to support continuous beam scanning with 2-bit phase control. Numerical examples are used to validate the theory. The proposed DD-TMA has significant potential for physical layer secure communication.
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