Adding diffuse scattering correlation to effective roughness models in ray tracing

Miao, Yang; Gueuning, Quentin; Gan, Mingming; Oestges, Claude

doi:10.23919/eucap.2017.7928171

Cited by 6 publications

(6 citation statements)

References 5 publications

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“…[24], [58]. Based on the constructed environment, physical approaches are applied to simulate the diffuse component such as the "ER" [24], [68], [75], "Beckmann-Kirchhoff (B-K) model" [5], [63], [64], and the "multiple-facets model" [56]. [24] proposed a 3-D model that is partly based on GO/uniform geometrical theory of diffraction (UTD) and partly on ER for evaluating the DS by building walls.…”

Section: Deterministic Modelsmentioning

confidence: 99%

A Survey of Dense Multipath and Its Impact on Wireless Systems

Jiang¹,

Wang²,

Miao

et al. 2022

IEEE Open J. Antennas Propag.

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In recent years wireless propagation channel research has paid considerable attention to dense multipath, which is an indispensable part of propagation channels and may significantly contribute to the received power in variety of environments and frequency bands. Mathematical representation of dense multipath is different from that of specular components (SCs) due to its distinct propagation mechanism and impact on system performance. Therefore, accurate understanding and modeling of dense multipath together with SCs are important for parametric channel estimation and for reliable simulation in wireless applications. This paper first presents a systematic survey of studies of dense multipath in terms of different representations, channel modeling approaches and estimation methods. Thereafter, a comprehensive review of the characteristics and impact of dense multipath on performance of communication, localization and sensing systems is provided. Finally, open research topics are discussed.INDEX TERMS Channel estimation, channel modeling, characteristics, communication, dense multipath.

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Section: Deterministic Modelsmentioning

confidence: 99%

A Survey of Dense Multipath and Its Impact on Wireless Systems

Jiang¹,

Wang²,

Miao

et al. 2022

IEEE Open J. Antennas Propag.

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“…The expressions for these three fields are the same as above and its supplementary definitions in the Appendix. But for a finite-length cylinder, LOS and NLOS can no longer be defined on the 2D plane but should be on the 3D space, which can be calculated by ray tracing method [31], [32].…”

Section: B Modified Model For Finite Cylindermentioning

confidence: 99%

“…An incident ray can excite numerous diffracted rays, which are all located on a conical surface with the diffracted point as the fixed point as shown in Figure 3(b). For a finite cylinder, there would be edge diffraction which occurs at the cap edge of the cylinder as is shown in Figure 3, its range covers a part of LOS and NLOS and can be found by ray tracing method [31], [32].…”

Section: ) Edge Diffract Fieldmentioning

confidence: 99%

Simulation and Measurement Validation of a Finite-Length Cylindrical 3D UTD Model

Liu

Gong

Pollin

et al. 2022

IEEE Open J. Antennas Propag.

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In this paper we provide a modified 3D Uniform Theory of Diffraction (UTD) model for a finite-length cylinder, and validate the model by comparing to the simulation and the measured data. The presented finite-cylinder UTD model is adapted from the conventional infinite-cylinder model, and we additionally add edge diffraction occurring at the edge of the cap of the finite cylinder. The simulation reference is obtained from the CST simulation and the measurement reference is obtained from a vector network analyzer based channel sounder. From the numerical examples and analysis, it is shown that the modified model agrees well with the references and is more accurate than the conventional unmodified model. This study proves the importance of the edge diffraction field for finite-cylinder UTD solutions specially when 1) the transmitter and receiver are at different heights relative to the cylinder, and 2) one is below and the other is above the height of the cylinder.

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“…The 3-D RT tool used in this paper is based on [14], and can be used to capture propagation mechanisms including LOS, SR with different order, penetration, diffraction, and diffuse scattering. This RT tool has been utilized in the literature and its effectiveness has been validated in [15], [16], [17]. The input information are the geometrical and electromagnetic descriptions of the environment, including walls, ceiling, floor and furniture if any, as well as the antenna radiation properties.…”

Section: B Ray Tracermentioning

confidence: 99%

Genetic Algorithm Combined with Ray Tracer for Optimizing Cell-Free mMIMO Topology in a Confined Environment

Pessemier

Martens

et al. 2021

2021 15th European Conference on Antennas and Propagation (EuCAP)

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This paper proposes a customized genetic algorithm (GA) to generate the optimal cell-free topology for multi-user massive MIMO (mMIMO) in a confined environment. As far as we know, it is beyond the literature and is the first attempt to apply GA in optimizing the base station (BS) antenna placement for cell-free mMIMO. The BS antennas' placement is encoded with an adjusted binary matrix representation, which is straightforward for the subsequent genetic operations. The explored candidates by GA can evolve beyond the parents, where the fitness of individuals is evaluated dynamically via a ray tracer channel simulator. Accelerated by a warm start strategy and elitist replacement, the proposed customized GA provides near-optimal results in experiments, applicable to generic environment with multiple mobile users and different signal-to-noise ratios.

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Adding diffuse scattering correlation to effective roughness models in ray tracing

Cited by 6 publications

References 5 publications

A Survey of Dense Multipath and Its Impact on Wireless Systems

A Survey of Dense Multipath and Its Impact on Wireless Systems

Simulation and Measurement Validation of a Finite-Length Cylindrical 3D UTD Model

Genetic Algorithm Combined with Ray Tracer for Optimizing Cell-Free mMIMO Topology in a Confined Environment

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