Direction modulation based on non‐linear frequency diverse array

Guo, Ruipeng; Liu, Huijie; Zhao, Lingfeng; Ni, Yinghong

doi:10.1049/ell2.12280

Cited by 4 publications

(5 citation statements)

References 12 publications

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“…It can be seen from Figure 3a that the beam scans linearly from 0 to 5 4 π in azimuth and from π 6 to π 3 in elevation. Figure 3b beam distribution in space when t = 3.5 × 10 −4 s. Then, according to (19) and (20), the beam direction is…”

Section: Rectangular Array Dmmentioning

confidence: 99%

“…Directional modulation ensures that the transmitted symbol in the desired direction can be correctly received and remains undemodulated in other directions [19], thereby ensuring secure transmission. In this letter, we refer to direction modulation (DM) as the utilization of non‐linear frequency offset settings, as proposed in [20]. This enables FDA beams to perform linear or non‐linear scanning, effectively addressing challenges posed by time‐variant applications.…”

Section: Introductionmentioning

confidence: 99%

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Direction modulation based on planar rectangular non‐linear frequency diverse array

Zhang,

Xie,

Guo

et al. 2023

Electronics Letters

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Since its inception, the frequency diverse array (FDA) has attracted extensive attention and research because of its unique properties. However, most of the research primarily focuses on linear geometry FDA, with fewer studies on planar FDA. This letter proposes a design method based on planar rectangular FDA (PRFDA), which adjusts the frequency of each array element nonlinearly so that the beam direction of planar rectangular FDA can change linearly or nonlinearly with time, forming the desired transmit beampattern. Theoretical analysis and simulation results verify the effectiveness of the proposed method.

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Section: Rectangular Array Dmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Direction modulation based on planar rectangular non‐linear frequency diverse array

Zhang,

Xie,

Guo

et al. 2023

Electronics Letters

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“…For example, the beam can be continuously scanned from -45°to +45°during the transmit time. The expected DM beam can be obtained by adjusting the frequency of each array element in a nonlinear way was firstly proposed [36], but there was no specific application. Traditional PA based communication systems carry communication information through stable phase and amplitude.…”

Section: Introductionmentioning

confidence: 99%

Time Frequency Direction Modulation Based on Nonlinear Frequency Diverse Array

et al. 2023

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The conventional frequency diversity array (FDA) can generate arcsine form of continuous direction modulation (DM) waveforms which can automatically scan the entire space range. However, the single waveform and time varying phase of FDA cannot meet the requirements of practical security communication application scenarios. Thus, a new transmit diversity technique, called time frequency direction modulation (TFDM), is proposed to improve azimuth security. In this paper, unique timefrequency information at a given azimuth was formed by designing the beam steering term and the frequency term of each array element on the basis of the time varying characteristics of the FDA. In a transmit duration , DM can be divided into linear DM (LDM) and nonlinear DM (NDM) according to the beam shape. For LDM, for a specific observation direction, the frequency reaches the set value when the beam energy reaches the maximum value when the beam scans to this direction, but the uniqueness of time frequency information no longer exists in other directions. For NDM, the beam can pass through a given azimuth multiple times and form multiple pairs of time-frequency information, which provides a new idea for realizing multi-directional communication and solving communication rate problems. Finally, the uni-directional and multi-directional communication based on three different safe communication methods: time-direction modulation (TDM), frequency-direction modulation (FDM), and time-frequency-direction modulation (TFDM) are realized and the validity of the proposed method and the corresponding theory are verified by extensive numerical results.INDEX TERMS Frequency diversity array(FDA), frequency modulated (FM), time frequency direction modulation(TFDM), security communication.

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“…In [10], the authors propose a method to generate direction modulation (DM) beams in the desired function form, not limited to the arcsine form. In [11], the application of DM was further explored in the physical layer of SC.…”

Section: Introductionmentioning

confidence: 99%

Beamforming for LEO satellite communication based on FDA

Xie

Zhang

et al. 2023

Electronics Letters

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Due to the time‐varying phase in frequency diverse arrays (FDAs), traditional phase‐based secure communication (SC) methods cannot be utilized. In this reported work, the automatic scanning property of FDAs (time‐varying property) was rederived. This property allows for the presetting of the beam scanning time towards the desired receiver (Bob). Subsequently, this time‐carrying beam design was applied to Low Earth Orbit (LEO) satellites. A satellite‐to‐ground communication method is proposed based on time intervals, which effectively prevents the interception of information by an undesired receiver (Eve). Simulation results are presented to validate the effectiveness of the proposed method.

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Direction modulation based on non‐linear frequency diverse array

Cited by 4 publications

References 12 publications

Direction modulation based on planar rectangular non‐linear frequency diverse array

Direction modulation based on planar rectangular non‐linear frequency diverse array

Time Frequency Direction Modulation Based on Nonlinear Frequency Diverse Array

Beamforming for LEO satellite communication based on FDA

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