Leszek Raschkowski

Leszek Raschkowski
Fraunhofer-Institut für Nachrichtentechnik, Heinrich-Hertz-Institut | HHI · Wireless Communications and Networks

Dipl.-Ing.

About

34
Publications
59,368
Reads
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1,392
Citations
Citations since 2017
18 Research Items
1249 Citations
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2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250

Publications

Publications (34)
Article
Full-text available
Performance testing under realistic propagation channel conditions is essential for virtual drive testing (VDT), where radio channel emulators are typically employed in the laboratory for such applications. Optimal allocation of tap resources in the channel emulator is critical in hardware-in-the-loop emulation of radio channels due to the constrai...
Article
Full-text available
Among the several features and capabilities introduced by every new 3GPP release on 5G cellular systems, the latest Release 17 will be remembered as the first that specifies a set of enhancements and adaptations to support mobile broadband services via satellite direct access. Specifically focused on the necessary physical layer mechanism and proce...
Chapter
In recent years, a high connectivity demand started being experienced in wireless communication. Practically, everyone and everything needs to be connected because of the huge variety of applications existing today. This is a challenging situation for terrestrial telecommunications infrastructure that they cannot address on their own. Therefore, th...
Article
Full-text available
Industrial internet of things (IIoT) is an emerging area that fifth-generation (5G) mobile communication system penetrates industrial manufacturing applications. The indoor factory has larger space and there are a lot of metal machine tools distributed in it, which makes its radio propagation characteristics and corresponding channel models signifi...
Article
Full-text available
In this paper, a review of the achieved accuracy in the literature for ray tracing (RT) based channel modeling is presented with a focus on outdoor propagation scenarios in the sub-6 GHz frequency range. The achieved accuracy is analyzed from three perspectives: 1) The input parameters which include the environmental description in the form of digi...
Preprint
Low Earth orbit (LEO) satellite networks will become an integral part of the global telecommunication infrastructure. Modeling the radio-links of these networks and their interaction with existing terrestrial systems is crucial for the design, planning and scaling of these networks. The 3rd generation partnership project (3GPP) addressed this by pr...
Preprint
Full-text available
The 3GPP new radio (NR) channel model introduced spatial consistency and a correlation model for multiple frequencies. Future extensions of this model will incorporate mobility at both ends of the link. These features are essential for many emerging wireless technologies in the 5G era. However, the existing small-scale-fading (SSF) model does not i...
Preprint
Full-text available
Providing reliable low latency wireless links for advanced manufacturing and processing systems is a vision of Industry 4.0. Developing, testing and rating requires accurate models of the radio propagation channel. The current 3GPP-NR model as well as the QuaDRiGa model lack the propagation parameters for the industrial indoor scenario. To close th...
Preprint
Full-text available
Spatial consistency was proposed in the 3GPP TR 38.901 channel model to ensure that closely spaced mobile terminals have similar channels. Future extensions of this model might incorporate mobility at both ends of the link. This requires that all random variables in the model must be correlated in 3 (single-mobility) and up to 6 spatial dimensions...
Conference Paper
Full-text available
5G mobile communication systems are likely to use the enormous bandwidths available at mm-wave frequencies. However, there is an important propagation effect that can have a major impact on the performance - the ground reflection (GR). This effect is currently not sufficiently covered by existing 3GPP propagation models. The GR causes fading both o...
Conference Paper
Full-text available
In order to realistically model urban micro-cell environments with low base station heights, a measurement campaign has been conducted in the 3.5–3.8 GHz frequency band. The two scenarios of interest are the Urban Micro (UMi) Campus and Open Square scenarios. The findings of this campaign led to a parameter set for the quasi deterministic radio cha...
Conference Paper
Full-text available
Massive MIMO with small-cells are attracting much attention as a promising scenario for 5G. In those deployment scenarios, it is considered that base stations (BSs) are located at heights below 10 m such as on a lamppost or an exterior wall of a building's second floor. However, the throughput performance in such scenarios has not been sufficiently...
Book
Full-text available
Written by leading experts in 5G research, this book is a comprehensive overview of the current state of 5G. Covering everything from the most likely use cases, spectrum aspects, and a wide range of technology options to potential 5G system architectures, it is an indispensable reference for academics and professionals involved in wireless and mobi...
Article
This article first identifies requirements of 5G radio propagation models for relevant propagation scenarios and link types derived from the analysis of recently discussed 5G visions and respective 5G technology trends. A literature survey reveals that none of the state-of-the-art propagation models such as WINNER/IMT-Advanced, COST 2100, and IEEE...
Article
Frequency-agile pathloss models for urban street canyons are discussed in this paper. The models are floating intercept (FI), fixed reference (FR), and ITU-R M.2135 urban microcellular (UMi) line-of-sight (LOS) and Manhattan-grid non-LOS (NLOS) models. These models are parameterized based on channel sounding campaigns in three cities covering radio...
Chapter
Written by leading experts in 5G research, this book is a comprehensive overview of the current state of 5G. Covering everything from the most likely use cases, spectrum aspects, and a wide range of technology options to potential 5G system architectures, it is an indispensable reference for academics and professionals involved in wireless and mobi...
Technical Report
Full-text available
In this report, the end user scenarios, test cases and requirements envisioned by the METIS project are mapped to propagation scenarios. Furthermore they are analysed for deriving a new set of requirements relevant for radio channel and propagation modelling. Since none of the existing channel models in the literature satisfies all these requiremen...
Conference Paper
Full-text available
This work provides an overview of potential interference management techniques for satellite forward and return links to be adopted for the supply of broadband services over Europe. After the analysis of the challenges present in multi-beam satellite systems at high-throughput, the performance assessment proven in realistic conditions of the improv...
Conference Paper
For the 5th generation of terrestrial mobile communications, Multi-Carrier (MC) transmission based on non-orthogonal waveforms is a promising technology component compared to orthogonal frequency division multiplex (OFDM) in order to achieve higher throughput and enable flexible spectrum management. Coverage extension and service continuity can be...
Article
Full-text available
Channel models are important tools to evaluate the performance of new concepts in mobile communications. How-ever, there is a trade-off between complexity and accuracy. In this paper, we extend the popular WINNER channel model with new features to make it as realistic as possible. Our approach enables more realistic evaluation results at an early s...
Technical Report
Full-text available
In this report, the results of the measurement campaigns are provided based on the propagation scenarios defined in METIS project. Channel modelling approaches are discussed and the Initial METIS Channel Model is described in detail. The initial METIS channel model includes both stochastic (generic) and map-based (site-specific) models. Moreover, t...
Conference Paper
The main objective of this paper is to present major challenges regarding the fifth generation (5G) mobile communications propagation modelling work in the European 7 th framework project METIS (Mobile and wireless communications Enablers for the Twenty-twenty Information Society). The goal of the propagation work in METIS is to provide adequate pr...
Conference Paper
In this paper we investigate the downlink performance of `massive` spatial division multiple access for different precoding strategies when deploying a large scale antenna system. `Massive' means that the number of served MSs is increased up to the number of transmit antennas. As intuitive and shown in this work, then user grouping is required so w...
Conference Paper
In this paper we present the implementation of a polarimetric 3D electromagnetical wave propagation simulator utilizing the NVIDIA® OptiX™ ray tracing engine. In order to get a reference for the performance of our simulator we analyze a conference room scenario which has been used for 60 GHz indoor channel analysis before by comparing measured and...

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