Doppler spectrum evaluation on V2V communications for platooning

In order to evaluate a communication system, we need to model the propagation channel of the relevant environments pertaining to that communication. In this paper, we propose a Geometry-Based Stochastic Channel Modeling approach to build up propagation channel simulations to assess the performance of vehicle-to-vehicle wireless communications. Our methodology allows the simulation of dynamic scenarios, with an electromagnetic simulator, to emulate typical propagation environments (rural, highway and urban-like propagation channels). Simple metallic plates are used to represent scatterers in the simulated geometric configurations. The common characteristics defining a propagation channel such as delay spread, angle of arrival distribution, and the delay-Doppler spectrum are obtained through adjustment of the number and location of those simple metallic plates.

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Getting Infrared Spectrum Evaluation Straight For Biomedical Applications

10.31988/scitrends.5411 ◽

2017 ◽

Author(s):

Thomas G. Mayerhöfer ◽

Jürgen Popp

Keyword(s):

Infrared Spectrum ◽

Biomedical Applications ◽

Spectrum Evaluation

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Retrieving of significant wave height and period from the Doppler spectrum of backscattered microwave signal

12th European Conference on Antennas and Propagation (EuCAP 2018) ◽

10.1049/cp.2018.1084 ◽

2018 ◽

Cited By ~ 4

Author(s):

M. Panfilova ◽

M. Ryabkova ◽

Y. Titchenko ◽

V. Karaev

Keyword(s):

Wave Height ◽

Significant Wave Height ◽

Microwave Signal ◽

Doppler Spectrum ◽

Significant Wave

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Haemodynamic changes in human kidney allografts following administration of nifedipine: assessment with doppler spectrum analysis

Transplant International ◽

10.1111/tri.1992.5.s1.17 ◽

1992 ◽

Vol 5 ◽

pp. S17-S20 ◽

Cited By ~ 4

Author(s):

J. W. S. Merkus ◽

L. B. Hilbrands ◽

A. J. Hoitsma ◽

W. N. J. C. van Asten ◽

R. A. P. Koene ◽

...

Keyword(s):

Spectrum Analysis ◽

Human Kidney ◽

Doppler Spectrum ◽

Haemodynamic Changes

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Comparative study about the routing protocols on the vehicular networks and the V2V communications

Proceedings of the 4th International Conference on Smart City Applications - SCA '19 ◽

10.1145/3368756.3369014 ◽

2019 ◽

Author(s):

Jellid Kawtar ◽

Mazri Tomader

Keyword(s):

Comparative Study ◽

Routing Protocols ◽

Vehicular Networks ◽

V2v Communications

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Investigating and Modeling of Cooperative Vehicle-to-Vehicle Safety Stopping Distance

Future Internet ◽

10.3390/fi13030068 ◽

2021 ◽

Vol 13 (3) ◽

pp. 68

Author(s):

Steven Knowles Flanagan ◽

Zuoyin Tang ◽

Jianhua He ◽

Irfan Yusoff

Keyword(s):

High Reliability ◽

Base Station ◽

Ieee 802.11P ◽

Packet Losses ◽

The Road ◽

V2v Communication ◽

Stopping Distance ◽

Vehicle To Vehicle ◽

V2v Communications ◽

On The Road

Dedicated Short-Range Communication (DSRC) or IEEE 802.11p/OCB (Out of the Context of a Base-station) is widely considered to be a primary technology for Vehicle-to-Vehicle (V2V) communication, and it is aimed toward increasing the safety of users on the road by sharing information between one another. The requirements of DSRC are to maintain real-time communication with low latency and high reliability. In this paper, we investigate how communication can be used to improve stopping distance performance based on fieldwork results. In addition, we assess the impacts of reduced reliability, in terms of distance independent, distance dependent and density-based consecutive packet losses. A model is developed based on empirical measurements results depending on distance, data rate, and traveling speed. With this model, it is shown that cooperative V2V communications can effectively reduce reaction time and increase safety stop distance, and highlight the importance of high reliability. The obtained results can be further used for the design of cooperative V2V-based driving and safety applications.

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Suppression of Wind Ripples and Microwave Backscattering Due to Turbulence Generated by Breaking Surface Waves

Remote Sensing ◽

10.3390/rs12213618 ◽

2020 ◽

Vol 12 (21) ◽

pp. 3618

Author(s):

Stanislav Ermakov ◽

Vladimir Dobrokhotov ◽

Irina Sergievskaya ◽

Ivan Kapustin

Keyword(s):

Remote Sensing ◽

Surface Waves ◽

Wave Breaking ◽

Wave Train ◽

Wind Waves ◽

Breaking Waves ◽

Doppler Spectrum ◽

Strong Wave ◽

Wave Maker ◽

Radar Backscattering

The role of wave breaking in microwave backscattering from the sea surface is a problem of great importance for the development of theories and methods on ocean remote sensing, in particular for oil spill remote sensing. Recently it has been shown that microwave radar return is determined by both Bragg and non-Bragg (non-polarized) scattering mechanisms and some evidence has been given that the latter is associated with wave breaking, in particular, with strong breaking such as spilling or plunging. However, our understanding of mechanisms of the action of strong wave breaking on small-scale wind waves (ripples) and thus on the radar return is still insufficient. In this paper an effect of suppression of radar backscattering after strong wave breaking has been revealed experimentally and has been attributed to the wind ripple suppression due to turbulence generated by strong wave breaking. The experiments were carried out in a wind wave tank where a frequency modulated wave train of intense meter-decimeter-scale surface waves was generated by a mechanical wave maker. The wave train was compressed according to the gravity wave dispersion relation (“dispersive focusing”) into a short-wave packet at a given distance from the wave maker. Strong wave breaking with wave crest overturning (spilling) occurred for one or two highest waves in the packet. Short decimeter-centimeter-scale wind waves were generated at gentle winds, simultaneously with the long breaking waves. A Ka-band scatterometer was used to study microwave backscattering from the surface waves in the tank. The scatterometer looking at the area of wave breaking was mounted over the tank at a height of about 1 m above the mean water level, the incidence angle of the microwave radiation was about 50 degrees. It has been obtained that the radar return in the presence of short wind waves is characterized by the radar Doppler spectrum with a peak roughly centered in the vicinity of Bragg wave frequencies. The radar return was strongly enhanced in a wide frequency range of the radar Doppler spectrum when a packet of long breaking waves arrived at the area irradiated by the radar. After the passage of breaking waves, the radar return strongly dropped and then slowly recovered to the initial level. Measurements of velocities in the upper water layer have confirmed that the attenuation of radar backscattering after wave breaking is due to suppression of short wind waves by turbulence generated in the breaking zone. A physical analysis of the effect has been presented.

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