180 research outputs found
An Efficient V2X Based Vehicle Localization Using Single RSU and Single Receiver
High accuracy vehicle localization information is critical for intelligent transportation systems and future autonomous vehicles. It is challenging to achieve the required centimeter-level localization accuracy, especially in urban or global navigation satellite system denied environments. Here we propose a vehicle-to-infrastructure (V2I)-based vehicle localization algorithm. First, it is low-cost and hardware requirements are simplified, the minimum requirement is a single roadside unit and single on-board receiver. Second, it is computationally efficient, the available V2I information is formulated as an over-determined system. Then, the vehicle position is estimated in a closed-form manner via the widely used weighted linear least squares (WLLS) method and meter level accuracy is achievable. Furthermore, the numerical performance of WLLS is consistent with the theoretical results in larger signal-to-noise ratio region
V2X Sidelink Positioning in FR1: Scenarios, Algorithms, and Performance Evaluation
In this paper, we investigate sub-6 GHz V2X sidelink positioning scenarios in
5G vehicular networks through a comprehensive end-to-end methodology
encompassing ray-tracing-based channel modeling, novel theoretical performance
bounds, high-resolution channel parameter estimation, and geometric positioning
using a round-trip-time (RTT) protocol. We first derive a novel, approximate
Cram\'er-Rao bound (CRB) on the connected road user (CRU) position, explicitly
taking into account multipath interference, path merging, and the RTT protocol.
Capitalizing on tensor decomposition and ESPRIT methods, we propose
high-resolution channel parameter estimation algorithms specifically tailored
to dense multipath V2X sidelink environments, designed to detect multipath
components (MPCs) and extract line-of-sight (LoS) parameters. Finally, using
realistic ray-tracing data and antenna patterns, comprehensive simulations are
conducted to evaluate channel estimation and positioning performance,
indicating that sub-meter accuracy can be achieved in sub-6 GHz V2X with the
proposed algorithms
Analysis of V2X Sidelink Positioning in sub-6 GHz
Radio positioning is an important part of joint communication and sensing in
beyond 5G communication systems. Existing works mainly focus on the mmWave
bands and under-utilize the sub-6 GHz bands, even though it is promising for
accurate positioning, especially when the multipath is uncomplicated, and
meaningful in several important use cases. In this paper, we analyze V2X
sidelink positioning and propose a new performance bound that can predict the
positioning performance in the presence of severe multipath. Simulation results
using ray-tracing data demonstrate the possibility of sidelink positioning, and
the efficacy of the new performance bound and its relation with the complexity
of the multipath
V2X communication coverage analysis for connected vehicles in intelligent transportation networks: A case study for the city of Xanthi, Greece
Intelligent transportation systems (ITS) have been developed to improve
traffic flow, efficiency, and safety in transportation. Technological
advancements in communication such as the Vehicle-to-Everything (V2X),
Vehicle-to-Vehicle (V2V) and Vehicle-to Infrastructure (V2I) enable the
real-time exchange of information between vehicles and other entities on the
road network, and thus play a significant role in their safety and efficiency.
This paper presents a simulation study that models V2V and V2I communication to
identify the most suitable range of data transmission between vehicles and
infrastructure. The provincial city of Xanthi, Greece is used as a cases study,
and the goal is to evaluate whether the proposed placement of Road Side Unit
(RSU) provided adequate communication coverage on the city's road network. An
analysis through different scenarios identified improvements in traffic
management, driving behavior and environmental conditions under different RSU
coverage. The results highlight that the communication range of 400 meters is
the most adequate option for optimum traffic management in the city of Xanthi.Comment: Wireless World Research Forum, Meeting 49, March 28th-30th 2023,
Pozna\'n, Poland, Towards sustainable and automated communication
Open Platforms for Connected Vehicles
L'abstract è presente nell'allegato / the abstract is in the attachmen
A Tutorial on Joint Radar and Communication Transmission for Vehicular Networks-Part II: State of the Art and Challenges Ahead
In Part I of this three-part tutorial on dual-functional radar-communication (DFRC), we overviewed the fundamental elements of DFRC. As Part II of the tutorial, this letter overviews the state-of-the-art (SoA) in DFRC, with a particular emphasis on the use of the technique for seamless connectivity in the vehicular network. We commence by introducing the conventional beam tracking approaches for millimeter wave (mmWave) communication systems, based exclusively on communication signalling and feedback, followed by the DFRC based schemes tailored for the vehicular network. Finally, we evaluate a number of SoA DFRC schemes through comparative simulations
Data-driven Integrated Sensing and Communication: Recent Advances, Challenges, and Future Prospects
Integrated Sensing and Communication (ISAC), combined with data-driven
approaches, has emerged as a highly significant field, garnering considerable
attention from academia and industry. Its potential to enable wide-scale
applications in the future sixth-generation (6G) networks has led to extensive
recent research efforts. Machine learning (ML) techniques, including
-nearest neighbors (KNN), support vector machines (SVM), deep learning (DL)
architectures, and reinforcement learning (RL) algorithms, have been deployed
to address various design aspects of ISAC and its diverse applications.
Therefore, this paper aims to explore integrating various ML techniques into
ISAC systems, covering various applications. These applications span
intelligent vehicular networks, encompassing unmanned aerial vehicles (UAVs)
and autonomous cars, as well as radar applications, localization and tracking,
millimeter wave (mmWave) and Terahertz (THz) communication, and beamforming.
The contributions of this paper lie in its comprehensive survey of ML-based
works in the ISAC domain and its identification of challenges and future
research directions. By synthesizing the existing knowledge and proposing new
research avenues, this survey serves as a valuable resource for researchers,
practitioners, and stakeholders involved in advancing the capabilities of ISAC
systems in the context of 6G networks.Comment: ISAC-ML surve
Integrated Sensing and Communications: Towards Dual-functional Wireless Networks for 6G and Beyond
As the standardization of 5G solidifies, researchers are speculating what 6G will be. The integration of sensing functionality is emerging as a key feature of the 6G Radio Access Network (RAN), allowing for the exploitation of dense cell infrastructures to construct a perceptive network. In this IEEE Journal on Selected Areas in Commmunications (JSAC) Special Issue overview, we provide a comprehensive review on the background, range of key applications and state-of-the-art approaches of Integrated Sensing and Communications (ISAC). We commence by discussing the interplay between sensing and communications (S&C) from a historical point of view, and then consider the multiple facets of ISAC and the resulting performance gains. By introducing both ongoing and potential use cases, we shed light on the industrial progress and standardization activities related to ISAC. We analyze a number of performance tradeoffs between S&C, spanning from information theoretical limits to physical layer performance tradeoffs, and the cross-layer design tradeoffs. Next, we discuss the signal processing aspects of ISAC, namely ISAC waveform design and receive signal processing. As a step further, we provide our vision on the deeper integration between S&C within the framework of perceptive networks, where the two functionalities are expected to mutually assist each other, i.e., via communication-assisted sensing and sensing-assisted communications. Finally, we identify the potential integration of ISAC with other emerging communication technologies, and their positive impacts on the future of wireless networks
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