Solutions of Time-Invariant Spatial Focusing for Multi-Targets Using Time Modulated Frequency Diverse Antenna Arrays

Yao, A-Min; Fang, Da‐Gang

doi:10.1109/tap.2016.2633902

Cited by 68 publications

(40 citation statements)

References 42 publications

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“…In {(9) in [14]; (4) in [15]}, the time 't' in the denominator is the time reference the authors selected (when the legitimate receiver samples signals), while the time 't' in the numerator should be the time instant when each receiver samples their detected signals. These two time 't' are not necessarily identical.…”

Section: Secure Reception Regions 'Propagate' In Range As Time Elamentioning

confidence: 99%

Can Frequency Diverse Array Prevent Wireless Eavesdropping_for_techRxiv.pdf

Yuan¹,

Narbudowicz²

2019

Preprint

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In this paper, the concept and recent development of exploiting frequency diverse array (FDA) and its variants for the physical-layer wireless security have been revisited and carefully examined. Following rigorous analytical derivation and illustrative simulations, the authors argue that the investigations performed in some recent works did not reveal one critical issue facing the real-world applications, and system models established and used before were based on an unrealistic assumption, i.e. that the legitimate and eavesdropping users at different ranges sample the signal waveforms at the same time instant. This misunderstanding results in conclusions that are misleading. The authors aim to take the first step to divert research efforts and rectify the previous problematic analyses. The authors prove that the FDA cannot secure a free-space wireless transmission in range domain, because the previously claimed ‘secure reception region’ propagates in range domain as time elapses.

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Section: Secure Reception Regions 'Propagate' In Range As Time Elamentioning

confidence: 99%

Can Frequency Diverse Array Prevent Wireless Eavesdropping_for_techRxiv.pdf

Yuan¹,

Narbudowicz²

2019

Preprint

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“…The principle is based on modified time modulated optimized frequency offset. It allows the FDA available for fixed-point communication and the signal is not easily intercepted [16]. In the above studies, the focus spots produced by the FDA were time invariant [17,18].…”

Section: Introductionmentioning

confidence: 83%

“…The FDA have great potential to change the traditional information and energy transfer ways [12][13][14]. From 2017, researchers began to concentrate on the study of spatial focusing using FDA technology [15][16][17][18]. In 2017 A. M. Yao proposed time-modulated FDA for achieving spatial focusing for multiple areas [15].…”

Section: Introductionmentioning

confidence: 99%

Achieving Spatial Multi-Point Focusing by Frequency Diversity Array

et al. 2019

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This paper proposes a class of frequency diverse array (FDA) for achieving time-varying spatial focusing for multiple targets. On the basis of single-target focusing of FDA, sequential focus at the four points is achieved by controlling the time period. The effects of frequency offset on the range of focusing area are derived. Since FDA is narrowband in nature, the relative operating bandwidth is limited to be 10%. Under the limitation of the bandwidth, the sequential multi-target focusing in the far-field is achieved. To validate the proposed method, numerical examples of eight-element FDA are reported and discussed.

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“…However, the actual illumination time should start at t = t o so that all the antennas can contribute in the illumination of target. Similarly, the research presented in [16], [17], [20], [21], [31], [32] shows the target illumination with respect to range and angle between t = 0 and t = T , which is again misleading. Similar to t = 0, the choice of t = T is incorrect because if t o is greater than T , the target will not illuminate.…”

Section: Signal Modelmentioning

confidence: 96%

Frequency Diverse Array Radar: New Results and Discrete Fourier Transform Based Beampattern

Zubair

Ahmed

Alouini

2020

IEEE Trans. Signal Process.

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In the phased-array radar (PAR) signals from each antenna are transmitted at the same carrier frequency, which yields narrowly focused only angle dependent beampattern. In contrast, in the frequency-diverse-array (FDA) radar signals from antenna array are generally transmitted at linearly increasing frequencies that yields range, time, and angle dependent beampattern. Reported literature on FDA radar missed the contribution of path-differences in the signal model due to the antenna array elements, which may lead to misleading results. In this work, incorporating missed path-differences, the signal model of FDA radar is corrected. Using the corrected signal model, it is shown that the instantaneous beampattern depends on the number of transmit antenna and average beampattern depends on the product of frequency-offset and pulse-duration. Moreover, to illuminate the desired region-of-interest for longer dwell time, discrete-Fourier-transform based low-complexity algorithm is proposed. In contrast to the conventional FDA radar's 'S' shaped beampattern, the beampattern of the proposed algorithm changes linearly with range. Simulation results compare the performance of our proposed algorithm with the existing ones and show the superiority of our proposed algorithm.Index Terms-Frequency-diverse-array radars, Linear and non-linear frequency offset, Time and range dependent beampattern, Discrete-Fourier-transform.

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Solutions of Time-Invariant Spatial Focusing for Multi-Targets Using Time Modulated Frequency Diverse Antenna Arrays

Cited by 68 publications

References 42 publications

Can Frequency Diverse Array Prevent Wireless Eavesdropping_for_techRxiv.pdf

Can Frequency Diverse Array Prevent Wireless Eavesdropping_for_techRxiv.pdf

Achieving Spatial Multi-Point Focusing by Frequency Diversity Array

Frequency Diverse Array Radar: New Results and Discrete Fourier Transform Based Beampattern

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