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Malte Schellmann

Malte Schellmann
Huawei Technologies German Research Center · Applied Communications Technology Lab

17.25
 · 
Dr.-Ing.

About

62
Publications
41,512
Reads
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2,358
Citations
Research Experience
April 2005 - December 2007
Technische Universität Berlin
Position
  • Research Assistant
April 2004 - November 2009
Fraunhofer-Institut für Nachrichtentechnik, Heinrich-Hertz-Institut
Position
  • Research Assistant

Publications

Publications (62)
Preprint
Full-text available
Fortuna is the connected automated vehicle prototype built by the fortiss research institute in the course of the project PROVIDENTIA. In the project, an intelligent infrastructure prototype is created along a 2.5 km stretch on the highway A9 north of the city of Munich, Germany. This paper presents the vehicle Fortuna and illustrates the requireme...
Article
Full-text available
Technologies for the autonomous driving have reached a level of maturity which enables its realization in the very near future. Incidents like the lethal Tesla car crash in 2017 or the accident of the Uber vehicle in March 2018 show, however, that it is not sufficient for a vehicle to rely solely on its on-board sensors. Communication between vehic...
Chapter
Full-text available
This chapter ventures in detail into antenna design, analog, digital and hybrid beamforming, covers novel physical layer (PHY), media access control (MAC), design paradigms and specific solutions for serving and multiplexing the main service types envisioned for 5th generation (5G). The support of multiple antennas both at the base station (BS) and...
Article
Full-text available
The fifth generation of cellular communication systems is foreseen to enable a multitude of new applications and use cases with very different requirements. A new 5G multiservice air interface needs to enhance broadband performance as well as provide new levels of reliability, latency and supported number of users. In this paper we focus on the mas...
Conference Paper
Full-text available
This paper proposes a unified way of describing 5G air interface (AI) design proposals using a 5G service/frequency map based on work carried out as part of 5G-PPP/H2020 project “METIS-II”. It then crucially proposes a design framework and suitability assessment process for 5G AI candidates. The proposed assessment methodology focuses on “harmoniza...
Conference Paper
Full-text available
In this paper, we present pulse shaped OFDM as an enabler for a flexible PHY design of the air interface for 5G. After introducing the waveform details and its degrees of freedom provided for the system design, we describe the suitable parameterizations to be considered for addressing the diverse requirements envisaged for future 5G systems, which...
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
Full-text available
5th generation mobile networks will have to cope with a high degree of heterogeneity in terms of services, mobility, number of devices and so on. Thus, diverse and often contradicting key performance indicators need to be supported, but having multiple radio access technologies for multi-service support below 6 GHz will be too costly. FANTASTIC-5G...
Article
Full-text available
OFDM-based waveforms with filtering functionalities are considered key enablers for a flexible air-interface design for multi-service support in future mobile systems. By allowing for the flexible configuration of physical layer parameters according to the diverse requirements of a service, these waveforms enable the in-band coexistence of differen...
Technical Report
Full-text available
The METIS-II project envisions the design of a new air interface in order to fulfil all the performance requirements of the envisioned 5G use cases including some extreme low latency use cases and ultra-reliable transmission, xMBB requiring additional capacity that is only available in very high frequencies, as well as mMTC with extremely densely d...
Conference Paper
Full-text available
In filterbank multicarrier systems with offset QAM signaling (FBMC/OQAM), real-field orthogonality is usually not sufficient to yield a frequency isolation of two resource blocks with different MIMO precoding for spatial multiplexing or beamforming. In this paper, we propose a novel scheme to avoid inter-block interference by adopting single band (...
Conference Paper
Full-text available
This paper considers the scenario of massive machine type communication (MTC) in cellular uplink for short packet traffic. For this traffic type, the closed loop Timing Advance (TA) adjustment process applied in current LTE uplink introduces significant overhead in signaling and energy consumption. We propose to pulse shape the OFDM signals using t...
Conference Paper
By application of pulse shaping, the FBMC (Filter Bank Multi Carrier) based offset-QAM-OFDM (OQAM-OFDM) modulation scheme offers a new degree of freedom in designing mobile communication systems. In this contribution we investigate the coexistence performance in terms of interference isolation of individually configured sub-bands, i.e. individual p...
Conference Paper
In the context of spectrum sharing, a loss in spectral efficiency is incurred due to required guard bands needed for a desired co-channel interference level between systems. Our main interest is to show whether FTN signaling can recover the loss of spectral efficiency (SE) due to guard bands by adjusting the symbol duration and tolerating ISI in pr...
Article
Full-text available
For future communication systems, filter bank multicarrier schemes offer the flexibility to increase spectrum utilization in heterogeneous wireless environments by good separation of signals in the frequency domain. To fully exploit this property for frame detection and synchronization, the advantage of the filter bank should be taken at the receiv...
Article
Filterbank multi-carrier with offset quadrature amplitude modulation (FBMC/OQAM) avoids the usage of the cyclic prefix (CP) by using more localized prototype filters. However, channel estimation in highly frequency selective channels is very challenging, especially for the scattered pilots due to the intrinsic interference leaked from the neighbori...
Conference Paper
Full-text available
Faster than Nyquist (FTN) signaling is a nonorthogonal transmission scheme, in which the pulses appear faster than the rate known from the Nyquist criterion. The FTN signaling offers a higher data rate compared to Nyquist signaling but results in intersymbol interference due to the violation of the Nyquist theorem. In this paper, we investigate the...
Conference Paper
Currently deployed mobile communication systems are designed to deliver a proper Quality of Service (QoS) only in certain channel environments. The necessary channel adaptivity is utilized by adaptive modulation and coding schemes by giving up channel capacity. For transmissions in dispersive channels theory predicts a performance gain, when the pu...
Conference Paper
Theory predicts a gain in transmission performance, when adapting pulse shapes of Offset Quadrature Amplitude Modulation (OQAM) Orthogonal Frequency Division Multiplexing (OFDM) systems to delay and Doppler spread in doublydispersive channels. Here we investigate the quantitative gains in reconstruction quality and bit error rate (BER) with respect...
Conference Paper
Full-text available
https://www.metis2020.com/wp-content/uploads/publications/CrownCom_2014_Schellmann_etal_FBMC-based_air_interface_for_5G_Mobile.pdf Scenarios envisaged for mobile communication systems beyond 2020 imply that future applications and services will impose highly diverse requirements on the system design. To appropriately respond to these requiremen...
Article
Full-text available
METIS is the EU flagship 5G project with the objective of laying the foundation for 5G systems and building consensus prior to standardization. The METIS overall approach toward 5G builds on the evolution of existing technologies complemented by new radio concepts that are designed to meet the new and challenging requirements of use cases today??s...
Conference Paper
In 2020, mobile and wireless traffic volume is expected to increase thousand-fold over 2010 figures. Moreover, an increase in the number of wirelessly-connected devices to counts in the tens of billions will have a profound impact on society. Massive machine communication, forming the basis for the Internet of Things, will make our everyday life mo...
Conference Paper
Full-text available
As of today, orthogonal frequency-division multiplexing (OFDM) has been the dominant technique in broadband transmission systems. However, for the application in cognitive radios, the sidelobes of rectangularly pulsed OFDM signals must be well suppressed to satisfy the rigorous spectral masks. In this context, filter-bank based multi-carrier (FBMC)...
Conference Paper
In this paper, we study the coexistence issues of LTE systems operating in the TV white spaces. The study includes a proposal for an appropriate system design as well as a discussion on the LTE system's self-configurability to avoid potential interference to other systems when the resource allocation is made flexible. This is evaluated in terms of...
Article
As one of the future indoor coverage solutions, this paper considers the cognitive Femtocell for LTE system [1], which can opportunistically access the TV white spaces. The paper selects a typical residential building for study case and uses the ray tracing method to obtain the channel profile in european TV bands. Through computer simulation, we d...
Article
Full-text available
The mobile communication technologies beyond the third generation are characterized by flexibility. Due to rapid growth of spectrum demand, future wireless networks should be able to dynamically allocate resources to maintain the quality of service (QoS) and promote the efficient use of radio spectrum. The dynamic spectrum management is an effectiv...
Chapter
Full-text available
In this chapter, a practical concept for resource management in the downlink of a multi-user MIMO-OFDM system is presented, which aims at high user rates while requiring a limited amount of feedback only. An extended score-based scheduling approach guarantees a fair resource allocation to the users, ensuring that users are served even if they exper...
Article
Full-text available
Multiantenna radio systems allow accessing the channel in diversity or spatial multiplexing (SMUX) mode. Adequate switching between these modes according to current channel conditions was shown to yield significant performance improvements while requiring little feedback from the receiving side. We present a transmission concept for the downlink of...
Conference Paper
By analytical means, this paper investigates the application of a multi-periodic preamble for the synchronization in OFDM systems, which is based on an auto-correlation of the received signal. In contrast to common system configurations, the multi-periodic preamble enables to select the two parameters correlation shift and correlation window length...
Article
Full-text available
Applying spatial mode switching in channel adaptive MIMO systems promises to achieve high spectral efficiencies in practical system setups. Several studies have pointed out significant performance gains obtained in realis-tically modeled channel scenarios. We have conducted chan-nel measurements with the Berlin LTE-Advanced Testbed operated in the...
Article
Full-text available
With the introduction of orthogonal frequency- division multiplexing and multiple antennas in cellular networks, there are new opportunities to adapt the transmission to propagation and interference conditions. In this article we describe a practical approach using space-frequency-selective multiuser MIMO scheduling. Frequency-selective feedback is...
Thesis
Full-text available
Die Kombination der MIMO Mehrantennentechnik mit der OFDM Mehrträgerübertragung verspricht das Erzielen hoher spektraler Effizienzen bei moderater Komplexität von Sender- und Empfängerstrukturen. Weiterhin erlaubt das MIMO-OFDM Systemkonzept die flexible Vergabe von Übertragungsressourcen in Zeit, Frequenz und Raum an unterschiedliche Nutzer. Diese...
Article
Full-text available
Multi-cellular radio systems are often limited due to the presence of cochannel interference. Proposed physical layer concepts, e.g. coordinated joint transmission and interference rejection combining, try to strengthen the signal while combating the interference. It is well known that base station cooperation yields great capacity improvement for...
Conference Paper
Full-text available
We consider the downlink of a multi-user MIMO OFDM system in a cellular environment, where users are scheduled to the transmission resources in frequency and space. Targeting a practical solution, we assume the use of fixed DFT- based pre-coding beams at the base stations and linear receivers at the multi-antenna terminals. After having received fe...
Article
Full-text available
In this work, we compare different pre-coding tech-niques and their performance in a cellular MIMO OFDM down-link. The first target is to determine the achievable additional beamforming gain by using a near-optium pre-coder instead of DFT-based pre-coding. In the second step, we include multi-user selection diversity, which turned out to be advanta...
Article
Full-text available
In OFDM-based space division multiple access (SDMA) systems, multiple users are served by a multiantenna base station simultaneously on the same frequency resources. In the uplink, each user's signal may be distorted by an independent carrier frequency offset (CFO), which impairs the orthogonality of the subcarrier signals and, if not properly comp...
Conference Paper
Full-text available
In high-mobility OFDM systems, Doppler distortions cause inter-carrier interference (ICI) that may degrade the system performance severely. Although thoroughly studied, hardly any approaches for ICI estimation and compensation exist that maintain the OFDM-specific subcarrier-wise signal processing and thus provide a solution with reasonable demands...
Conference Paper
Full-text available
Channel adaptive transmission in multi-user MIMO systems is seen as a promising concept to achieve high spectral efficiencies in future radio networks: Based on feedback on actual channel conditions, the base station allocates transmission resources to the user terminals where they can support high data rates. However, due to the delay between eval...
Conference Paper
Full-text available
Information theory predicts huge performance gains in terms of spectrum efficiency by using cooperative transmission from multiple base stations. Cooperation eliminates inter-cell interference and it enables a higher channel rank. The isolated cell capacity is an upper bound for unlimited backbone capacity, infinite signal processing power and infi...
Conference Paper
Full-text available
Multi-cellular radio systems are often limited due to the presence of cochannel interference. Physical layer concepts as e.g. interference rejection combining, optimize the receiver side and thus strengthen the signal while combating the interference at the terminal side only. It is well known that joint transceiver optimization, i.e. coordinated j...
Conference Paper
Full-text available
We consider synchronization techniques required to enhance the cellular network capacity using base station cooperation. In the physical layer, local oscillators are disciplined by the global positioning system (GPS) and over the backbone network for outdoor and indoor base stations, respectively. In the medium access control (MAC) layer, the data...
Conference Paper
Full-text available
Cellular radio systems are often limited due to the presence of cochannel interference. Basically, radio systems may be operated by utilizing asynchronous or synchronous downlink transmission from all base stations in the system, where synchronization between terminals and their serving base station is mandatory in both concepts. We provide a compa...
Article
Full-text available
We consider feedback design for the integration of multi-user MIMO in cellular mobile radio systems. Feedback is given by the mobile ter-minals, which report beam indices referring to a set of fixed pre-coding beams and corresponding signal to signal to interference and noise ratio (SINR) for different supported spatial transmission modes. The SINR...
Conference Paper
Full-text available
Multicellular radio systems are often limited due to the presence of cochannel interference. Proposed physical layer concepts, e.g. coordinated joint transmission and interference rejection combining, try to strengthen the signal while combating the interference. However, the performance may be limited by the available channel knowledge. We provide...
Conference Paper
Doppler distortions caused by mobile users destroy the orthogonality of the signals used in OFDMA systems, causing severe interferences which may limit the system performance. We propose a scheme to estimate and compensate the Doppler distortions in OFDMA systems, where users are assigned subbands of contiguous subcarriers, so called chunks. The sc...
Conference Paper
Full-text available
Multi-antenna radio systems which are capable to select the spatial transmission mode according to the current channel conditions promise to achieve high transmission rates. Considering multiple users, the rates can be further increased if the multi-user diversity is properly utilized. However, fairness constraints have to be taken into account her...
Conference Paper
Full-text available
We demonstrate that the fundamental capacity scaling law of multiple-input multiple-output radio systems, being proportional to the minimum of the number of receive and transmit antennas, holds also for the interference-limited multi-user multi-cell downlink scenario. It can be realized by using a sophisticated combination of physical and medium ac...
Conference Paper
Full-text available
We demonstrate how virtual MIMO techniques can be implemented in a next-generation mobile communication system. In order to test basic principles, joint spatiotemporal processing of two users has been implemented in an uplink scenario. A prerequisite of virtual MIMO is accurate synchronization. It is shown that the carrier frequency offset can be r...
Conference Paper
Full-text available
In wireless communications, different schemes for multiple antennas may be applied in order to achieve high data rates through spatial multiplexing (SM) or reliability through spatial diversity. In this paper, we analyze the throughput achieved by SM and quasi-orthogonal space-time block codes (QSTBC) using a successive interference cancellation (S...
Conference Paper
Full-text available
We evaluate the performance of the common idea to switch between spatial multiplexing and diversity transmission based on the actual channel state, aiming at maximizing the achievable data rate. For different spatial transmission schemes the achievable data rate is evaluated based on the signal to interference and noise ratio (SINR) seen after the...
Conference Paper
The demand for wireless broadband access systems supporting mobility of the individual users has dramatically increased in recent years. To this end, we analyze the impact of user-mobility in the uplink of an OFDMA system on the performance of pilot-aided channel estimation. We analyze the mean square error (MSE) performance of two pilot-aided chan...
Conference Paper
Full-text available
OFDM-SDMA systems are intended to allow multiple users to communicate simultaneously with a base station in the same frequency band. In these systems, each user signal may be distorted by an independent carrier frequency offset (CFO), which will result in a severe degradation of the system performance if no CFO compensation is carried out. The stan...
Conference Paper
Full-text available
This paper investigates the value of spatial diversity for the synchronisation in MIMO-OFDM systems. A preamble-based synchronisation scheme exploiting the available spatial diversity of a MIMO system is proposed and evaluated by simulation. It is shown that synchronisation becomes significantly more reliable compared to a system where only single...
Conference Paper
During the uplink of a multi-user MIMO system, a compensation of different users' carrier frequency offsets (CFOs) at the receiver's side is possible only after the spatial separation of the single user signals. As spatial separation requires knowledge of the communication channel, this issue longs for a channel estimation scheme capable to estimat...

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Projects

Projects (4)
Archived project
Project
FANTASTIC-5G will develop a new multi-service Air Interface (AI) for below 6 GHz through a modular design. For details, see http://fantastic5g.eu/ Involved in work package 3 on radio link design.