35 research outputs found
Simplified Ray Tracing for the Millimeter Wave Channel: A Performance Evaluation
Millimeter-wave (mmWave) communication is one of the cornerstone innovations
of fifth-generation (5G) wireless networks, thanks to the massive bandwidth
available in these frequency bands. To correctly assess the performance of such
systems, however, it is essential to have reliable channel models, based on a
deep understanding of the propagation characteristics of the mmWave signal. In
this respect, ray tracers can provide high accuracy, at the expense of a
significant computational complexity, which limits the scalability of
simulations. To address this issue, in this paper we present possible
simplifications that can reduce the complexity of ray tracing in the mmWave
environment, without significantly affecting the accuracy of the model. We
evaluate the effect of such simplifications on link-level metrics, testing
different configuration parameters and propagation scenarios.Comment: 6 pages, 6 figures, 1 table. This paper has been accepted for
presentation at ITA 2020. (c) 2020 IEEE. Please cite it as: M. Lecci, P.
Testolina, M. Giordani, M. Polese, T. Ropitault, C. Gentile, N. Varshney, A.
Bodi, M. Zorzi, "Simplified Ray Tracing for the Millimeter Wave Channel: A
Performance Evaluation," Information Theory and Applications Workshop (ITA),
San Diego, US, 202
Methodology for Benchmarking Radio-Frequency Channel Sounders through a System Model
Development of a comprehensive channel propagation model for high-fidelity design and deployment of wireless communication networks necessitates an exhaustive measurement campaign in a variety of operating environments and with different configuration settings. As the campaign is time-consuming and expensive, the effort is typically shared by multiple organizations, inevitably with their own channel-sounder architectures and processing methods. Without proper benchmarking, it cannot be discerned whether observed differences in the measurements are actually due to the varying environments or to discrepancies between the channel sounders themselves. The simplest approach for benchmarking is to transport participant channel sounders to a common environment, collect data, and compare results. Because this is rarely feasible, this paper proposes an alternative methodology - which is both practical and reliable - based on a mathematical system model to represent the channel sounder. The model parameters correspond to the hardware features specific to each system, characterized through precision, in situ calibration to ensure accurate representation; to ensure fair comparison, the model is applied to a ground-truth channel response that is identical for all systems. Five worldwide organizations participated in the cross-validation of their systems through the proposed methodology. Channel sounder descriptions, calibration procedures, and processing methods are provided for each organization as well as results and comparisons for 20 ground-truth channel responses
A Comprehensive Evaluation of Indoor Ranging Using Ultra-Wideband Technology
Ultra-wideband technology shows promise for precision ranging due to its fine time resolution to resolve multipath fading and the presence of lower frequencies in the baseband to penetrate walls. While a concerted effort has been conducted in the extensive modeling of the indoor UWB channel in recent years, to our knowledge only two papers have reported ranging performance, but for limited range and fixed bandwidth and center frequency. In principle, boosting power can guarantee connectivity between transmitter and receiver, but not precision due to the distorting effects of walls and other objects in the direct path. In order to gauge the limits of UWB ranging, we carry out 5000 measurements up to an unprecedented 45 m in non-line-of-sight conditions in four separate buildings with dominant wall material varying from sheet rock to steel. In addition, we report performance for varying bandwidth and center frequency of the system
A Comprehensive Evaluation of Indoor Ranging Using Ultra-Wideband Technology
<p/> <p>Ultra-wideband technology shows promise for precision ranging due to its fine time resolution to resolve multipath fading and the presence of lower frequencies in the baseband to penetrate walls. While a concerted effort has been conducted in the extensive modeling of the indoor UWB channel in recent years, to our knowledge only two papers have reported ranging performance, but for limited range and fixed bandwidth and center frequency. In principle, boosting power can guarantee connectivity between transmitter and receiver, but not precision due to the distorting effects of walls and other objects in the direct path. In order to gauge the limits of UWB ranging, we carry out 5000 measurements up to an unprecedented 45 m in non-line-of-sight conditions in four separate buildings with dominant wall material varying from sheet rock to steel. In addition, we report performance for varying bandwidth and center frequency of the system.</p
Geolocation Techniques - Principles and Applications
Geolocation Techniques: Principles and Applications provides a comprehensive overview of geolocation technologies and techniques, from radio-frequency based to inertial based. The focus of this book is to provide an overview on the different types of infra-structure supported by most commercial localization systems as well as on the most popular computational techniques which these systems employ. This book can serve as a reference for scholarly activities such as teaching, self-learning, or research