A5074417899- Millimeter-Wave Propagation and Modeling
- Vehicular Ad Hoc Networks (VANETs)
- Power Line Communications and Noise
- Advanced MIMO Systems Optimization
- Wireless Body Area Networks
- Advanced Wireless Communication Techniques
- Wireless Communication Networks Research
- Bluetooth and Wireless Communication Technologies
- Antenna Design and Analysis
- Ultra-Wideband Communications Technology
- Microwave Engineering and Waveguides
- Opportunistic and Delay-Tolerant Networks
- UAV Applications and Optimization
- Energy Efficient Wireless Sensor Networks
- Mathematical Analysis and Transform Methods
- Network Time Synchronization Technologies
- Video Surveillance and Tracking Methods
- Indoor and Outdoor Localization Technologies
- RFID technology advancements
- Cooperative Communication and Network Coding
- Blind Source Separation Techniques
- Wireless Signal Modulation Classification
- Autonomous Vehicle Technology and Safety
- Advanced Image and Video Retrieval Techniques
- Image and Signal Denoising Methods
Austrian Institute of Technology
2011-2023
Forschungszentrum Telekommunikation Wien
2008-2014
Mälardalen University
2013
University of Kassel
2013
Universitat Politècnica de Catalunya
2013
University of Agder
2013
Universitat de Miguel Hernández d'Elx
2013
To make transportation safer, more efficient, and less harmful to the environment, traffic telematics services are currently being intensely investigated developed. Such require dependable wireless vehicle-to-infrastructure vehicle-to-vehicle communications providing robust connectivity at moderate data rates. The development of such vehicular communication systems standards requires accurate models propagation channel in all relevant environments scenarios. Key characteristics channels...
Vehicular communication channels are characterized by a non-stationary time- and frequency-selective fading process due to rapid changes in the environment. The can be assuming local stationarity for region with finite extent time frequency. For this wide-sense uncorrelated-scattering (WSSUS) assumption holds approximately we able calculate frequency dependent scattering function (LSF). In paper, estimate LSF from large set of measurements collected DRIVEWAY'09 measurement campaign, which...
The fading process in high speed vehicular traffic telematic applications at 5 GHz is expected to fulfill the wide-sense stationarity uncorrelated scattering (WSSUS) assumption for very short time-intervals only. In order test this we apply concept of a local time- and frequency-variant function, which estimate from measurements vehicle-to-vehicle wave propagation channels by means multi-window spectrogram. obtained temporal sequence functions (LSF) used calculate collinearity measure. We...
This paper deals with channel estimation for orthogonal frequency-division multiplexing (OFDM) in time-variant wireless propagation channels. We particularly consider the challenges of IEEE 802.11p standard, which is worldwide dominant system vehicular communications. For historic reasons, uses a pilot pattern that identical to used 802.11a, was initially designed indoor channels little or no time variations. Therefore, this violates sampling theorem both large delay spread and Doppler...
The assumption of wide-sense-stationarity (WSS) and uncorrelated scattering (US) wireless propagation channels is widespread for the design analysis channels. However, only valid within a limited range. In this paper, we investigate extension range not in time (WSS), but also frequency (US), measured vehicular We do by using collinearity local function, which bounded spectral distance metric, thus allows us to set an indicative threshold, turn enables WSS US test. prove that fading process...
This paper presents the results of an empirical study wireless propagation channels for vehicle-to-vehicle communications in street intersections, a scenario especially important collision avoidance applications. The are derived from channel measurement campaign performed at 5.6 GHz four different types urban intersections. We present on typical power delay profiles, pathloss and spreads discuss mechanisms. By comparing we find that absence line-of-sight is problematic system coverage, when...
Vehicular communication channels are characterized by a non-stationary time- and frequency-selective fading process due to fast changes in the environment. We characterize distribution of envelope first delay bin vehicle-to-vehicle means its Rician <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="TeX">$K$</tex-math></inline-formula> -factor. analyze time–frequency variability this channel parameter using vehicular...
In this paper we present an overview of a vehicle-to-vehicle radio channel measurement campaign at 5.6 GHz. The selected scenarios are based on important safety-related applications. We explain why these interesting from the aspect propagation. Further describe power-delay profile and Doppler spectral density two situations especially suitable for collision avoidance applications: A traffic congestion situation where one car is overtaking another one, general line-of-sight obstruction...
The time-variant vehicle-to-vehicle radio propagation channel in the frequency band from 59.75 to 60.25 GHz has been measured an urban street city center of Vienna, Austria. We have a set 30 realizations capture effect overtaking vehicle. Our experiment was designed for characterizing large-scale fading and small-scale depending on vehicle's position. demonstrate that large vehicles boost mean receive power by up 10 dB. analysis reveals two-wave with diffuse (TWDP) model is adequate. By...
The notable increase in insect populations over the recent years has been closely linked to rising global temperatures and more frequent drought events, both consequences of climate change. This surge activity had a significant impact on agricultural production [1]. Among crops most affected is sugar beet eastern part Austria [2], where outbreaks weevil (Asproparthenis punctiventris) have become increasingly common. Identifying regions prone such infestations could aid crop planning...
This paper presents a double directional analysis of vehicle-to-vehicle channel measurements conducted in three different traffic scenarios. Using high- resolution algorithm, we derive parameters like Angle-of-Arrival (AOA), Angleof- Departure (AOD), propagation delay and Doppler shift identify underlying mechanisms by combining these estimates with maps the measurement sites. The results show that first-order reflections from small number interacting objects can account for large part...
Inside a tunnel, electromagnetic wave propagation differs strongly from the well understood "open-air" situation. The characterization of tunnel environment is crucial for deploying vehicular communication systems. In this paper we evaluate vehicle-to-vehicle (V2V) radio channel measurements inside tunnel. We estimate time-varying root mean square (rms) delay and Doppler spreads, as excess maximum dispersion. fading process in V2V communications inherently non-stationary. Hence, characterize...
Vehicle-to-vehicle (V2V) communication is a challenging but fast-growing technology. It has the potential to enhance road safety by helping driver avoid collisions during basic maneuvers such as crossing street intersections, changing lanes, merging on highway, and driving safely in blind turns. The significance of V2V applications increases further where visual line-of-sight (LOS) unavailable because buildings, roadside sound berms, or small hills at an intersection point two more roads...
This paper presents the results of an accuracy assessment a deterministic channel model for vehicle-to-vehicle (V2V) communications. Channel simulations obtained from ray-tracing developed by TU Braunschweig are compared to data gathered during DRIVEWAY V2V measurement campaign at 5.6 GHz in city Lund summer 2009. The analysis focuses on PDP and gains urban four-way intersection scenario. Despite some implementation-based limitations model, very good agreement between simulation is achieved....
Cell-free widely distributed massive multiple-input multiple-output (MIMO) systems utilize radio units spread out over a large geographical area. The signal of user equipment (UE) is coherently detected by subset (RUs) in the vicinity UE and processed jointly at nearest baseband processing unit (BPU). This architecture promises two orders magnitude less transmit power, spatial focusing position for high reliability, consistent throughput coverage All these properties have been investigated...
Traffic safety can be improved by using a vehicular dedicated communication protocol. The standard IEEE 802.11p is being developed for this purpose. physical layer properties of draft are based on the already widely used 802.11a standard. Nevertheless, propagation conditions in communications different to ones considered 802.11a, which focusing nomadic indoor usage, and well studied until now. In paper we present simulation results obtained from an implemented model channel describes very...
This paper reports on a power-delay profile measurement campaign emulating mobile vehicle-to-infrastructure urban-highway environment. The measured location is in the city of Brno, Czech Republic. Utilizing correlative 50 GS/s time-domain channel sounder with center frequency 59.6 GHz and 8 bandwidth open-ended WR15 waveguide antennas, we characterize representative millimeter wave radio channels terms RMS delay spread its variability caused by scatterers (i.e., vehicles). exhibits notable...
In this paper we present a software defined radio (SDR) based measurement framework that allows for simultaneous measurements of wireless communication channels over multiple bands. We and discuss results vehicular-to-infrastructure multiband channel campaign at center frequencies 3.2 GHz, 34.3 GHz 62.35 in street crossing scenario. The is conducted using bandwidth 155.5 MHz sounding repetition rate 31.25 μs. compare the time-variant power delay profile (PDP) Doppler spectral density (DSD).
Future automation and control units for advanced driver assistance systems (ADAS) will exchange sensor kinematic data with nearby vehicles using wireless communication links to improve traffic safety. In this paper we present an accurate real-time system-level simulation multi-vehicle scenarios support the development test of connected ADAS systems. The physical data-link layer are abstracted provide frame error rate (FER) a network simulator. FER is strongly affected by non-stationary...
Non wide-sense stationary (WSS) uncorrelated-scatterering (US) fading processes are observed in vehicular communications. To estimate such a process under additive white Gaussian noise we use the local scattering function (LSF). In this paper present an optimal parametrization of multitaper-based LSF estimator. We do by quantizing mean square error (MSE). For that purpose structure two-dimensional Wiener filter and optimize parameters estimator to obtain minimum MSE (MMSE). split WSS regions...
In this paper we analyze the Ricean K-factor for vehicle-to-vehicle (V2V) communications in a typical open sub-urban street crossing. The channel conditions vary from non line-of sight (NLOS) to line-of-sight (LOS). antenna arrays used recording radio channels consist of 4 elements with directional radiation patterns. We measured 16 individual single-input single-output channels, bandwidth 240MHz duration 20 s. performed two kind evaluations. For first analysis partitioned into 24 sub-bands...