Validation of a non-line-of-sight path-loss model for V2V communications at street intersections

Abbas, Taimoor; Thiel, Andreas; Zemen, Thomas; Mecklenbräuker, Christoph F.; Tufvesson, Fredrik

doi:10.1109/itst.2013.6685545

Cited by 38 publications

(38 citation statements)

References 9 publications

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“…In the model C=3.75 dB is the so-called curve shift, L S U =2.94 dB is the sub-urban loss, i s =0 is the urban loss factor, i s =1 the sub-urban loss factor, E L =2.69 is the loss exponent, E S =0.81 is the street exponent, E T =0.957 is the TX distance exponent, and finally d b =180 m is the break even distance. The model was later validated by independent measurement data by Abbas et al [40] with good agreement, but also with the suggestion to include a random offset parameter to reflect variations between different street intersections; random variations were also suggested in [41] based on the comparison of ray tracing results with the model of [42]. Delay Dispersion: As far as the delay dispersion is concerned, the rms delay spread (second central moment of the power delay profile) for V2V environments varies as a function of location, and can be modeled as a random variable (log normally distributed in most cases).…”

Section: Device-to-device Modelsmentioning

confidence: 99%

Propagation Channel Models for Next-Generation Wireless Communications Systems

Molisch

Tufvesson

2014

IEICE Trans. Commun.

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SUMMARYAs new systems and applications are introduced for nextgeneration wireless systems, the propagation channels in which they operate need to be characterized. This paper discusses propagation channels for four types of next-generation systems: (i) distributed Multiple-Input Multiple-Output (MIMO) and Cooperative MultiPoint (CoMP) systems, which require the characterization of correlation between channels from a mobile station to different base stations or access points; (ii) device-todevice communications, where propagation channels are characterized by strong mobility at both link ends (e.g., in vehicle-to-vehicle communications), and/or significant impact of moving shadowing objects; (iii) fulldimensional MIMO, where antenna arrays extend in both the horizontal and vertical dimension, so that azimuthal and elevation dispersion characteristics of the channel become relevant, and (iv) millimeter wave Wireless Local Area Network (WLAN) and cellular communication systems, where the high carrier frequency leads to a change (compared to microwave communications) concerning which propagation processes are dominant. For each of these areas, we give an overview of measurements and models for key channel properties. A discussion of open issues and possible future research avenues is also provided.

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Section: Device-to-device Modelsmentioning

confidence: 99%

Propagation Channel Models for Next-Generation Wireless Communications Systems

Molisch

Tufvesson

2014

IEICE Trans. Commun.

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“…Intersections are a challenging environment for V2V wireless communication, as the V2V communication links may be blocked by high-rise buildings and other obstructions. Measurements have shown that the strength of the received signal power reduces quickly with distance from the intersection [7][8][9][10][11][12][13], resulting in significant degradation of V2V transmission performance; the packet delivery ratio reduced notably at distances of 40-50 m from the intersection [10]. Moreover, the data packet collision problem tends to be more severe at intersections, as the vehicle density is usually higher at an intersection than in other places.…”

Section: Introductionmentioning

confidence: 99%

A Semi-Empirical Performance Study of Two-Hop DSRC Message Relaying at Road Intersections

et al. 2018

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This paper is focused on a vehicle-to-vehicle (V2V) communication system operating at a road intersection, where the communication links can be either line-of-sight (LOS) or non-line-of-sight (NLOS). We present a semi-empirical analysis of the packet delivery ratio of dedicated short-range communication (DSRC) safety messages for both LOS and NLOS scenarios using a commercial transceiver. In a NLOS scenario in which the reception of a safety message may be heavily blocked by concrete buildings, direct communication between the on-board units (OBUs) of vehicles through the IEEE 802.11p standard tends to be unreliable. On the basis of the semi-empirical result of safety message delivery at an intersection, we propose two relaying mechanisms (namely, simple relaying and network-coded relaying) via a road-side unit (RSU) to improve the delivery ratio of safety messages. Specifically, we designed RSU algorithms to optimize the number of relaying messages so as to maximize the message delivery ratio of the entire system in the presence of data packet collisions. Numerical results show that our proposed relaying schemes lead to a significant increase in safety message delivery rates.

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“…In this way, the transmission range of each vehicle is the same and constant, and vehicles move straightly at a constant speed in those protocols. They ignore the channel state information and the mobility model that characterizes the individual, which are important factors to calculate the link stability [3]. Therefore it increases the difficulty to apply the traditional protocols into reality.…”

Section: Introductionmentioning

confidence: 99%

A Stable Routing Protocol for Highway Mobility over Vehicular Ad-Hoc Networks

Lin

2015

2015 IEEE 81st Vehicular Technology Conference (VTC Spring)

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Vehicular ad hoc network (VANET) is a promising technology to enable the communications among vehicles. In intelligent transportation systems (ITSs), VANETs have many unstable channel characteristics such as short transmission time, low packet delivery ratio, frequent link breakage and rapidly changing topology caused by high mobility. One of the critical issues is the design of stable and scalable routing algorithms that are robustness to frequent path disruptions caused by vehicles' mobility. Previous stable routing protocols in VANETs have been generally focused on vehicle position and velocity based on the ignorance of the channel conditions. This paper argues the use of vehicles movement information including highway mobility model besides position, direction, velocity and digital mapping of roads to predict how long a route will last. And the channel state information is introduced to calculate every moving vehicle's transmission range. In this way, a new vehicular reliability model is proposed to facilitate the reliable routing in VANETs. The communication-link reliability is defined as the routes' stable lifetime. The well-known ad-hoc on-demand distance vector (AODV) routing protocol is extended to propose our reliable ad-hoc on-demand distance vector routing protocol AODV-L. To evaluate the proposed routing protocol, we compared the traditional AODV routing protocol with AODV-L through OMNET++. Simulation results demonstrate that AODV-L outperforms significantly the AODV routing protocol in terms of better delivery ratio and less end-to-end delay.

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Validation of a non-line-of-sight path-loss model for V2V communications at street intersections

Cited by 38 publications

References 9 publications

Propagation Channel Models for Next-Generation Wireless Communications Systems

Propagation Channel Models for Next-Generation Wireless Communications Systems

A Semi-Empirical Performance Study of Two-Hop DSRC Message Relaying at Road Intersections

A Stable Routing Protocol for Highway Mobility over Vehicular Ad-Hoc Networks

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