A Cluster-Based Three-Dimensional Channel Model for Vehicle-to-Vehicle Communications

We develop a novel three-dimensional (3D) cluster-based channel model for vehicle-to-vehicle (V2V) communications under the scenarios of urban street scattering environments. The proposed model combines the flexibility of geometrical channel models with the existing state-of-the-art 3D V2V models. To provide an accurate representation of specific locations and realistic V2V fading environments in a computationally manageable fashion, all clusters are divided into three groups of use cases including “ahead,” “between,” and “behind” clusters according to the relative locations of clusters. Using the proposed V2V model, we first derive the closed-form expressions of the channel impulse response (CIR), including the line-of-sight (LoS) components and cluster components. Subsequently, for three categories of clusters, the corresponding statistical properties of the reference model are studied. We additionally derive the expressions of the 3D space-time correlation function (STCF), the autocorrelation function (ACF), and 2D STCF. Finally, comparisons with on-road measurement data and numerical experiments demonstrate the validity and effectiveness of the proposed 3D cluster-based V2V model.

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Geometry-Based Channel Modelling for Vehicle-to-Vehicle Communication: A Review

International Journal of Antennas and Propagation ◽

10.1155/2021/4293266 ◽

2021 ◽

Vol 2021 ◽

pp. 1-10

Author(s):

Jalel Chebil ◽

Hanene Zormati ◽

Jamel Belhadj Taher

Keyword(s):

Wireless Communication ◽

Communication Channel ◽

Channel Model ◽

Three Dimensional ◽

Future Research ◽

Channel Models ◽

Channel Modelling ◽

V2v Communication ◽

Vehicle To Vehicle ◽

Three Dimensional Models

Vehicle-to-Vehicle (V2V) communication has received a lot of attention over recent years since it can improve the efficiency and safety of roads for drivers and travellers besides other numerous applications. However dynamic nature of this environment makes it difficult to come up with a suitable wireless communication channel model that can be used in the simulation of any V2V communication system. This paper reviews the recent techniques used for geometry-based stochastic channel modelling for V2V communication. It starts by presenting the various classes of wireless communication channel models available in the literature with more emphasis on the Geometry-Based Stochastic channel Models (GBSM). Then the paper discusses in more detail the state of the art of the regular-shaped and irregular-shaped GBSM for the two- and three-dimensional models. Finally, main challenges are identified and future research directions in this area are recommended.

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Effect of position of the fiber transport channel on fiber motion in the high-speed rotor

Textile Research Journal ◽

10.1177/00405175211001804 ◽

2021 ◽

pp. 004051752110018

Author(s):

Rui Hua Yang ◽

Chuang He ◽

Bo Pan ◽

Hongxiu Zhong ◽

Cundong Xu

Keyword(s):

High Speed ◽

Channel Model ◽

Three Dimensional ◽

Discrete Phase Model ◽

Transport Channel ◽

Rotor Spinning ◽

Fiber Motion ◽

Discrete Phase ◽

Airflow Field ◽

Fiber Transport

The task of the fiber transport channel (FTC) is to transport the fibers from the carding roller to the rotor. Its geometric position in the spinning machine has a strong influence on the characteristics of the airflow field and the trajectory of the fiber motion in both the rotor and the FTC. In this paper, a three-dimensional pumping rotor spinning channel model was established using ANSYS-ICEM-CFD software with three different positions of the FTC (positions a–c). Further, the simulations of air distribution were performed using Fluent software. In addition, the discrete phase model was used to fit the fiber motion trajectory in the rotor. The simulation results showed that among the three types of FTC, position b is the optimal condition. The gradients of airflow velocity in the channel at position b were greater than those of the other two positions, which is conducive to straightening of the fiber.

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A 3D Cluster-Based Channel Model for 5G and Beyond Vehicle-to-Vehicle Massive MIMO Channels

IEEE Transactions on Vehicular Technology ◽

10.1109/tvt.2021.3100389 ◽

2021 ◽

pp. 1-1

Author(s):

Lu Bai ◽

Ziwei Huang ◽

Yiran Li ◽

Xiang Cheng

Keyword(s):

Massive Mimo ◽

Channel Model ◽

Mimo Channels ◽

Vehicle To Vehicle

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A Small PWR-Core Physical Calculation Based on PWR-Core Analysis Code CORAL

10.1115/icone28-64912 ◽

2021 ◽

Author(s):

Wen Yang ◽

Lun Zhou ◽

Junrong Qiu ◽

Yun Tai

Keyword(s):

Density Distribution ◽

Power Distribution ◽

Channel Model ◽

Three Dimensional ◽

Least Square ◽

Object Oriented Programming ◽

Core Analysis ◽

Fuel Temperature ◽

Fuel Assemblies ◽

Calculation Results

Abstract Three dimensional PWR-core analysis code CORAL is developed by Wuhan Second Ship Design and Research Institute. This code provides basic functions including three-dimensional power distribution, fine power reconstruction, fuel temperature distribution, critical search, control rod worth, reactivity coefficients, burnup and nuclide density distribution, etc. CORAL employ nodal expansion method to solve neutron diffusion equation, and the least square method is used to achieve few group constants, and sub-channel model and one-dimensional heat transfer is used to calculate fuel temperature and coolant density distribution, and burnup distribution and nuclide nuclear density could be obtained by solving macro-depletion and micro-depletion equation. The CORAL code is convenient to update and maintain in consider of modular, object-oriented programming technology. In order to analyze the computational accuracy of the CORAL code in small PWR-core and its capability to deal with heterogeneous, calculation analysis are carried out based on the material and geometry parameters of the SMART core. The core has 57 fuel assemblies, with 8, 20 or 24 gadolinium rods arranged in the fuel assemblies. In this paper, a quantitative comparison and analysis of the small PWR problem calculation results are carried out. Numerical results, including effective multiplication factor, assembly power distribution and pin power distribution, all agree well with the calculation results of OpenMC or Bamboo at both hot zero-power (HZP) and hot full-power (HFP) conditions.

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Research on Spatial Channel Model for Vehicle-to-Vehicle Communication Channel in Roadside Scattering Environment

International Journal of Antennas and Propagation ◽

10.1155/2017/3098198 ◽

2017 ◽

Vol 2017 ◽

pp. 1-12 ◽

Cited By ~ 4

Author(s):

Xin Chen ◽

Yong Fang ◽

Weidong Xiang ◽

Liang Zhou

Keyword(s):

Communication Channel ◽

Channel Model ◽

Critical Distance ◽

Traffic Density ◽

Vehicle Speed ◽

Angle Of Arrival ◽

Vehicle To Vehicle ◽

Proposed Model ◽

Spatial Channel Model ◽

The Impact

In this paper, an extension of spatial channel model (SCM) for vehicle-to-vehicle (V2V) communication channel in roadside scattering environment is investigated for the first time theoretically and by simulations. Subsequently, to efficiently describe the roadside scattering environment and reflect the nonstationary properties of V2V channels, the proposed SCM V2V model divides the scattering objects into three categories of clusters according to the location of effective scatterers by introducing critical distance. We derive general expressions for the most important statistical properties of V2V channels, such as channel impulse response, power spectral density, angular power density, autocorrelation function, and Doppler spread of the proposed model. The impact of vehicle speed, traffic density, and angle of departure, angle of arrival, and other statistical performances on the V2V channel model is thoroughly discussed. Numerical simulation results are presented to validate the accuracy and effectiveness of the proposed model.

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Three-Dimensional MIMO Channel Model with High-Mobility Wireless Communication Systems Using Leaky Coaxial Cable in Rectangular Tunnel

International Journal of Antennas and Propagation ◽

10.1155/2021/6622135 ◽

2021 ◽

Vol 2021 ◽

pp. 1-11

Author(s):

Kai Zhang ◽

Fangqi Zhang ◽

Guoxin Zheng ◽

Lei Cang

Keyword(s):

Wireless Communication ◽

Communication Systems ◽

Channel Model ◽

Mimo System ◽

Three Dimensional ◽

High Mobility ◽

Coaxial Cable ◽

Mimo Channel ◽

Wireless Communication Systems ◽

Rectangular Tunnel

With the rapid development of high-mobility wireless communication systems, e.g., high-speed train (HST) and metro wireless communication systems, more and more attention has been paid to the wireless communication technology in tunnel-like scenarios. In this paper, we propose a three-dimensional (3D) nonstationary multiple-input multiple-output (MIMO) channel model with high-mobility wireless communication systems using leaky coaxial cable (LCX) inside a rectangular tunnel over the 1.8 GHz band. Taking into account single-bounce scattering under line-of-sight (LoS) and non-line-of-sight (NLoS) propagations condition, the analytical expressions of the channel impulse response (CIR) and temporal correlation function (T-CF) are derived. In the proposed channel model, it is assumed that a large number of scatterers are randomly distributed on the sidewall of the tunnel and the roof of the tunnel. We analyze the impact of various model parameters, including LCX spacing, time separation, movement velocity of Rx, and K-factor, on the T-CF of the MIMO channel model. For HST, the results of some further studies on the maximum speed of 360 km/h are given. By comparing the T-CF between the dipole MIMO system and the LCX-MIMO system, we can see that the performance of the LCX-MIMO system is better than that of the dipole MIMO system.

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