Frequency Diverse Array Beamforming Using Nonuniform Logarithmic Frequency Increments

Mahmood, Mobeen; Mir, Hasan

doi:10.1109/lawp.2018.2867085

Cited by 39 publications

(31 citation statements)

References 8 publications

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“…Frequency diverse array (FDA) has gained increasing attention in recent year in Radar community [1][2][3][4][5][6] due to its distinct range-dependent beampattern that enables the capability of rejecting interference in range domain. A conventional FDA (CFDA) is constructed by applying a fraction of linear carrier frequency offset across the radiated array elements, named as linear-FDA hereafter.…”

Section: Introductionmentioning

confidence: 99%

“…Some recent works have been reported in order to address these issues. [3][4][5][6][7] Specifically, in Khan et al, 3 instead of linear frequency offsets the logarithmic frequency offset was employed to achieve a nonperiodic beampattern with compromised resolution performance in the range and angle domains. It was further extended to multicarrier scenarios in Shao et al 4 In Mahmood and Mir, 5 a nonmonotonically increasing increment used as logarithmic frequency offset was described, achieving improved range resolution at the price of larger bandwidth.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, range information cannot be directly obtained from the beampattern peak due to the coupled range‐angle relationship. Some recent works have been reported in order to address these issues . Specifically, in Khan et al, instead of linear frequency offsets the logarithmic frequency offset was employed to achieve a nonperiodic beampattern with compromised resolution performance in the range and angle domains.…”

Section: Introductionmentioning

confidence: 99%

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Frequency diverse array with random logarithmically increasing frequency offset

Huang

Ding

Ouyang

et al. 2020

Micro & Optical Tech Letters

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The frequency diverse arrays (FDAs) have been extensively investigated since it can provide a unique anglerange-dependent beampattern. This range-dependent characteristic can suppress the range ambiguous clutters, leading to many novel potential Radar applications. Two issues, however, exist in conventional FDA (CFDA) beampatterns, that is, range-angle coupling and range periodicity. Therefore, for a CFDA Radar, target range information cannot be obtained directly from the beampattern peaks and target ambiguity occurs in the range domain. In this work, a new frequency diverse array (FDA) transmitter architecture with random logarithmically increasing frequency offset (log-RFDA) is presented. It is shown that the proposed strategy provides a nonperiodic thumbtack-like beampattern, eliminating the ambiguity in range domain, suffered in the CFDA Radar. Furthermore, reduced side lobe and higher detection resolution can be achieved, compared with the previously reported log-FDA. K E Y W O R D Sfrequency diverse arrays, higher detection resolution, nonperiodic thumbtacklike beampattern, random logarithmically increasing frequency offset

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Frequency diverse array with random logarithmically increasing frequency offset

Huang

Ding

Ouyang

et al. 2020

Micro & Optical Tech Letters

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show abstract

“…Several works have focused on frequency offsets to address the coupling problem of FDA [ 18 ]. To this end, in [ 19 , 20 ], the authors proposed a logarithmic frequency increments scheme. Furthermore, with random frequency increments between each element, the author of [ 21 ] proposed a new FDA structure, named random FDA, to indicate targets’ direction and range without coupling.…”

Section: Introductionmentioning

confidence: 99%

Spatial Modulation and MP-WFRFT-Aided Multi-Beam Wireless Communication Scheme Based On Random Frequency Diverse Array

Gao

Qiu

Zhou

2020

Sensors

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A security-enhanced, spectral-efficient, and power-efficient multi-beam wireless communication scheme based on random frequency diverse array (RFDA) is proposed in this paper. (AN)-aided directional modulation (DM) schemes. Furthermore, with the aid of spatial modulation (SM) technology and cooperative legitimate users (LUs), we can transmit more information bits by the use of LU number informations than the single modulation symbols. Unlike conventional zero-forcing (ZF) beamforming for multi-beam DM, we design a FDA beamforming vector for each LU based on the minimum transmit power method. Numerical simulations show that (1) the proposed scheme is power-efficient compared to the conventional schemes, (2) the proposed scheme can transmit more information bits than the conventional schemes, and (3) the proposed scheme can ensure communication security when eavesdroppers (Eves) are proximal to LUs or even in same locations.

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“…In [4], a logarithmically increasing frequency offset FDA was proposed to achieve a single-maximum beampattern without periodic range variation, which was further extended in [5] by using multicarrier logarithmic frequency offset increments. Later, a concept using logarithmic frequency increments with a nonuniform spacing was proposed in [6] with suppressed sidelobes. In [7], a random frequency diverse array (RFDA) was introduced.…”

Section: Introductionmentioning

confidence: 99%

Index Modulation for Frequency Diverse Array

Huang

Ouyang

Ding

et al. 2020

Antennas Wirel. Propag. Lett.

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The Index Modulation (IM) approach adds an extra signal modulation dimension by utilizing sub-carrier index domain, that is in addition to the traditional IQ domain. Frequency diverse array (FDA) technology is rapidly developing as a new technique for radar systems. In this letter, a novel transmitter architecture for FDA, combining index modulation concept with FDA, namely IM-FDA, is presented. Compared with conventional frequency diverse arrays (CFDAs), the proposed architecture offers thumbtack-like beampatterns which can decouple the range and angle dependence, an issue existing in CFDA. An additional benefit is that apart from sensing target location, information can be conveyed to the targets through the selected frequency offset indices in the proposed scheme. The transmitter architecture is elaborated along with its design details and the efficacy of the proposed architecture is validated via numerical results for the transmit beampattern by comparison with CFDA and random frequency diverse array (RFDA).

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Frequency Diverse Array Beamforming Using Nonuniform Logarithmic Frequency Increments

Cited by 39 publications

References 8 publications

Frequency diverse array with random logarithmically increasing frequency offset

Frequency diverse array with random logarithmically increasing frequency offset

Spatial Modulation and MP-WFRFT-Aided Multi-Beam Wireless Communication Scheme Based On Random Frequency Diverse Array

Index Modulation for Frequency Diverse Array

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