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View article: Cramér-Rao Bound Analysis of Radars for Extended Vehicular Targets With Known and Unknown Shape
Cramér-Rao Bound Analysis of Radars for Extended Vehicular Targets With Known and Unknown Shape Open
Due to their shorter operating range and large bandwidth, automotive radars can resolve many reflections from their targets of interest, mainly vehicles. This calls for the use of extended-target models in place of simpler and more widely-…
View article: Optimizing the mmWave Channel Estimation Duration by Rate Prediction
Optimizing the mmWave Channel Estimation Duration by Rate Prediction Open
In millimeter-wave (mmWave) wireless communications, the duration of the channel estimation plays a major role to establish the links before data transmission. However, fixed or long channel estimation can substantially hinder the achievab…
View article: 5G multi-BS Positioning with a Single-Antenna Receiver
5G multi-BS Positioning with a Single-Antenna Receiver Open
Cellular localization generally relies on timedifference-of-arrival (TDOA) measurements. In this paper, we investigate a novel scenario where the mobile user estimates its own position by jointly exploiting TDOA and angle of departure (AOD…
View article: RadChat: Spectrum Sharing for Automotive Radar Interference Mitigation
RadChat: Spectrum Sharing for Automotive Radar Interference Mitigation Open
In the automotive sector, both radars and wireless communication are susceptible to interference. However, combining the radar and communication systems, i.e., radio frequency (RF) communications and sensing convergence, has the potential …
View article: 5G mmWave Downlink Vehicular Positioning
5G mmWave Downlink Vehicular Positioning Open
5G new radio (NR) provides new opportunities for accurate positioning from a single reference station: large bandwidth combined with multiple antennas, at both the base station and user sides, allows for unparalleled angle and delay resolu…
View article: Fast in-Band Position-Aided Beam Selection in Millimeter-Wave MIMO
Fast in-Band Position-Aided Beam Selection in Millimeter-Wave MIMO Open
Millimeter-wave (mm-wave) and massive multiple-input-multiple-output technologies appear as key enablers in future emerging wireless communication systems. Propagation in mm-wave communications is well described by geometric channel models…
View article: 5G mm Wave Downlink Vehicular Positioning
5G mm Wave Downlink Vehicular Positioning Open
5G new radio (NR) provides new opportunities for accurate positioning from a single reference station: large bandwidth combined with multiple antennas, at both the base station and user sides, allows for unparalleled angle and delay resolu…
View article: Tensor Decomposition Based Beamspace ESPRIT for Millimeter Wave MIMO Channel Estimation
Tensor Decomposition Based Beamspace ESPRIT for Millimeter Wave MIMO Channel Estimation Open
We propose a search-free beamspace tensor-ESPRIT algorithm for millimeter wave MIMO channel estimation. It is a multidimensional generalization of beamspace-ESPRIT method by exploiting the multiple invariance structure of the measurements.…
View article: 5G mmWave Vehicular Tracking
5G mmWave Vehicular Tracking Open
Vehicle positioning based on GPS is limited due to multipath and blockage. 5G mmWave signals can provide an attractive complement, as it is possible to estimate the state of a vehicle (position and heading) from transmissions from a single…
View article: Optimal Precoders for Tracking the AoD and AoA of a mmWave Path
Optimal Precoders for Tracking the AoD and AoA of a mmWave Path Open
In millimeter-wave channels, most of the received energy is carried by a few paths. Traditional precoders sweep the angle-of-departure (AoD) and angle-of-arrival (AoA) space with directional precoders to identify directions with largest po…
View article: Impact of Rough Surface Scattering on Stochastic Multipath Component Models
Impact of Rough Surface Scattering on Stochastic Multipath Component Models Open
Multipath-assisted positioning makes use of specular multipath components (MPCs), whose parameters are geometrically related to the positions of the transceiver nodes. Diffuse scattering from rough surfaces affects the observed specular re…
View article: Improved Pedestrian Detection under Mutual Interference by FMCW Radar Communications
Improved Pedestrian Detection under Mutual Interference by FMCW Radar Communications Open
The widespread of automotive radars leads to increase of mutual interference, which in turn degrades road safety. The effect of mutual interference with a focus on detection of pedestrians is investigated. It is shown that detection of ped…
View article: Radar Communication for Combating Mutual Interference of FMCW Radars
Radar Communication for Combating Mutual Interference of FMCW Radars Open
Commercial automotive radars used today are based on frequency modulated continuous wave signals due to the simple and robust detection method and good accuracy. However, the increase in both the number of radars deployed per vehicle and t…
View article: Achievable Information Rates for Nonlinear Fiber Communication via End-to-end Autoencoder Learning
Achievable Information Rates for Nonlinear Fiber Communication via End-to-end Autoencoder Learning Open
Machine learning is used to compute achievable information rates (AIRs) for a simplified fiber channel. The approach jointly optimizes the input distribution (constellation shaping) and the auxiliary channel distribution to compute AIRs wi…
View article: Implicit Cooperative Positioning in Vehicular Networks
Implicit Cooperative Positioning in Vehicular Networks Open
Absolute positioning of vehicles is based on Global Navigation Satellite Systems (GNSS) combined with on-board sensors and high-resolution maps. In Cooperative Intelligent Transportation Systems (C-ITS), the positioning performance can be …
View article: 5GCAR project D3.1 Intermediate 5G V2X Radio
5GCAR project D3.1 Intermediate 5G V2X Radio Open
The 5GCAR project aims to contribute to 5G network design, and specifically to design V2X technology components for V2X use case classes identified in the project. The requirements on reliability, latency, data rates, spectral and energy e…
View article: A Solution for Removing Automotive Radar Interference: Radar Communications
A Solution for Removing Automotive Radar Interference: Radar Communications Open
Automotive radar is becoming an indispensable equipment in modern cars, for different functions including lane keeping,speed control and parking, especially due to its immunity to bad weather conditions [1]. Likewise, vehicle-to-vehicle(V2…
View article: MmWave Hybrid Array with More Users than RF Chains
MmWave Hybrid Array with More Users than RF Chains Open
In millimeter wave communications, hybrid analog-digital arrays consisting of only a few radiofrequency (RF) chains offer an attractive alternative to costly digital arrays. A limitation to hybrid arrays is that the number of streams that …
View article: MIMO with More Users than RF Chains.
MIMO with More Users than RF Chains. Open
Antenna arrays with hybrid analog-digital signal processing capabilities offer a compromise between the performance of digital arrays and the cost-efficiency of analog arrays with a single radio-frequency (RF) chain. A limitation of hybrid…
View article: Implicit Cooperative Positioning in Vehicular Networks
Implicit Cooperative Positioning in Vehicular Networks Open
Absolute positioning of vehicles is based on Global Navigation Satellite Systems (GNSS) combined with on-board sensors and high-resolution maps. In Cooperative Intelligent Transportation Systems (C-ITS), the positioning performance can be …
View article: Direct Localization for Massive MIMO
Direct Localization for Massive MIMO Open
Large-scale MIMO systems are well known for their advantages in communications, but they also have the potential for providing very accurate localization, thanks to their high angular resolution. A difficult problem arising indoors and out…
View article: Location-aided mm-wave channel estimation for vehicular communication
Location-aided mm-wave channel estimation for vehicular communication Open
Millimeter-wave (mm-wave) communication is a promising technology for next-generation wireless systems. One challenging application lies in the vehicular domain, where mm-wave should support ultra-fast and high-rate data exchanges among ve…