Experimental Dynamical Evolution of the Brillouin Precursor for Broadband Wireless Communication Through Vegetation

Alejos, Ana Vázquez; Dawood, Muhammad; Medina, Luis

doi:10.2528/pier10100706

Cited by 21 publications

(6 citation statements)

References 24 publications

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“…As shown in Figure 5a, the chosen tree’s dimensions are larger in height and width than the model used for simulations: 5.5 m tall and 4.25 m wide. The larger width compensates the lesser homogeneity of the canopy that presents considerably more air gaps than in the simulated model becoming a polidispersive medium [46]. Figure 5b shows the surroundings of the chosen isolated tree, which is at least around 10 m away from any other tree.…”

Section: Isolated Single Tree Radio Channel Characterizationmentioning

confidence: 99%

A Radio Channel Model for D2D Communications Blocked by Single Trees in Forest Environments

Picallo

Klaina

López-Iturri

et al. 2019

Sensors

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In this paper we consider the D2D (Device-to-Device) communication taking place between Wireless Sensor Networks (WSN) elements operating in vegetation environments in order to achieve the radio channel characterization at 2.4 GHz, focusing on the radio links blocked by oak and pine trees modelled from specimens found in a real recreation area located within forest environments. In order to fit and validate a radio channel model for this type of scenarios, both measurements and simulations by means of an in-house developed 3D Ray Launching algorithm have been performed, offering as outcomes the path loss and multipath information of the scenarios under study for forest immersed isolated trees and non-isolated trees. The specific forests, composed of thick in-leaf trees, are called Orgi Forest and Chandebrito, located respectively in Navarre and Galicia, Spain. A geometrical and dielectric model of the trees were created and introduced in the simulation software. We concluded that the scattering produced by the tree can be divided into two zones with different dominant propagation mechanisms: an obstructed line of sight (OLoS) zone far from the tree fitting a log-distance model, and a diffraction zone around the edge of the tree. 2D planes of delay spread value are also presented which similarly reflects the proposed two-zone model.

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Section: Isolated Single Tree Radio Channel Characterizationmentioning

confidence: 99%

A Radio Channel Model for D2D Communications Blocked by Single Trees in Forest Environments

Picallo

Klaina

López-Iturri

et al. 2019

Sensors

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“…RoF has attracted considerable attention for its potential application in future broadband wireless access networks because of its advantages of extremely low propagation loss, unlimited fiber bandwidth, immunity to electromagnetic interference, and high spatial division multiplexing on account of large atmospheric attenuation [8][9][10][11]. In an RoF system, the cost-effective and high quality generation of high frequency mm-wave signals is a key technology that requires further development toward high-frequency bands, especially for frequencies above 40 GHz [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Development of a New Approach for High-Quality Quadrupling Frequency Optical Millimeter-Wave Signal Generation Without Optical Filter

Al-Shareefi

Hassan

Malek

et al. 2013

PIER

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Abstract-In this paper, we propose a new approach to generate quadrupling-frequency optical millimeter-wave (mm-wave) signal with carrier suppression by using two parallel Mach-Zehnder modulators (MZMs) in Radio-over-fiber (RoF) system. Among the numerous properties of this approach, the most important is that a filterless optical mm-wave at 60 GHz with an optical sideband suppression ratio (OSSR) as high as 40 dB can be obtained when the extinction ratio of the MZM is 25 dB. Simplicity and cost-effectiveness have made this approach a compelling candidate for future wave-division-multiplexing RoF systems.Theoretical analysis is conducted to suppress the undesired optical sidebands for the high-quality generation of frequency quadrupling mm-wave signal. The simulation results show that a 60 GHz mm-wave is generated from a 15 GHz radio frequency (RF) oscillator with an OSSR as high as 40 dB and an radio frequency spurious suppression ratio (RFSSR) exceeding 35 dB without any optical or electrical filter when the extinction ratio of the MZM is 25 dB. Furthermore, the effect of the non-ideal RF-driven voltage as well as the phase difference of RF-driven signals applied to the two MZMs on OSSR and RFSSR is discussed and analyzed. Finally, we establish a RoF system through simulation to verify the transmission performance of the proposed scheme. The Q-factor performance and eye patterns are given.

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“…Their calculation was later corrected and modified [14], and precursors consistent with the theory were experimentally observed [15]. The Brillouin precursor, containing low-frequency wave components, exhibits power-law decay with propagation distance [16] and is expected to be applied to communication [17] and radar [18].…”

Section: Introductionmentioning

confidence: 87%

Exact solution of the propagation of ON-OFF signals by dispersive waves

Yamamoto

2024

Phys. Scr.

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The propagation of ON-OFF signals with dispersive waves is examined in this study.An integral-form exact solution for a simple ON-OFF switching event is derived, which holds for any dispersion relation.The integral can be exactly calculated for two types of dispersion relations.Further, the analysis of these solutions shows that the ON-OFF signal propagates with the group velocity and that the boundary thickness of the signal increases with time, typically at a rate proportional to the square root of time, owing to dispersion.Additionally, an approximate solution for a general dispersion relation is derived, and a for a higher-complexity ON-OFF switching pattern is constructed.

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Experimental Dynamical Evolution of the Brillouin Precursor for Broadband Wireless Communication Through Vegetation

Cited by 21 publications

References 24 publications

A Radio Channel Model for D2D Communications Blocked by Single Trees in Forest Environments

A Radio Channel Model for D2D Communications Blocked by Single Trees in Forest Environments

Development of a New Approach for High-Quality Quadrupling Frequency Optical Millimeter-Wave Signal Generation Without Optical Filter

Exact solution of the propagation of ON-OFF signals by dispersive waves

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