Andreas Springer

Andreas Springer
Johannes Kepler University Linz | JKU · Institute for Communications Engineering and RF-Systems

Univ.-Prof. Dipl.-Ing. Dr.

About

310
Publications
47,878
Reads
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2,781
Citations
Citations since 2016
91 Research Items
1593 Citations
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
Introduction
1991 Dipl.-Ing. in Electrical Engineering, Technical University of Vienna, Austria 1996 Dr. techn. (Ph.D) degree Johannes Kepler University Linz (JKU), Austria 2001 Univ.-Doz. (Habilitation) degree, JKU 2005 Professor and head of the Institute for Communications Engineering and RF-Systems at JKU Since 2017 he is co-leader of the “Christian Doppler Lab for Digitally Assisted RF Transceivers for Future Mobile Communications”. Research on wireless communication systems, single- and multi-carrier communications, architectures & algorithms for multiband/multimode transceivers, UMTS/HSDPA/LTE/5G, and wireless sensor networks, millimeter wave communications and recently molecular communications.
Additional affiliations
January 1998 - December 2012
Johannes Kepler Universität Linz
Education
September 1991 - May 1996
Johannes Kepler University Linz
Field of study
  • Mechatronics
October 1985 - June 1991
TU Wien
Field of study
  • Electrical Engineering

Publications

Publications (310)
Article
Full-text available
Abstract This paper proposes a low power application dedicated protocol stack which consists of a contention‐constrained p‐CSMA (CCP) protocol over the LoRa modulation technique and a consecutive successful transmission controlled transport (CSTCT) protocol. The aim of these innovative protocols is to boost the network performance in terms of throu...
Article
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This paper presents a novel network architecture called edge acknowledging and a MAC protocol to enhance the reliability of LoRaWAN confirmed messaging. The edge acknowledging exploits the great capability of the gateway and high reliability of the cable-based connection between the gateway and net server to reduce the vulnerable period of the conf...
Conference Paper
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Functional safety has become a crucial part of industrial automation. With industry environments being connected more than ever, achieving required functional safety depends on establishing safety-critical communication. Numerous application layer safety protocols have been developed to ensure compliance with functional safety standards for wired c...
Article
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With ever more stringent requirements of cellular standards it is an ongoing challenge to find the optimal RF transmitter architecture. In recent years, the multiphase transmitter (MP TX) architecture has been introduced as a promising candidate. It features high power efficiency and avoids phase modulation which is critical for upconversion of ult...
Preprint
Full-text available
Industrial wireless sensor networks are becoming crucial for modern manufacturing. If the sensors in those networks are mobile, the position information, besides the sensor data itself, can be of high relevance. E.g. this position information can increase the trustability of a wireless sensor measurement by assuring that the sensor is not physicall...
Article
This letter proposes a deep learning approach to detect a change in the antenna orientation of transmitter or receiver as a physical tamper attack in OFDM systems using channel state information. We treat the physical tamper attack problem as a semi-supervised anomaly detection problem and utilize a deep convolutional autoencoder (DCAE) to tackle i...
Article
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Digital-to-time converters (DTCs) are a promising technology for radio frequency (RF) transceivers but are prone to spur generation. A common approach to change the spurious emissions to a spur-free shape is a method called dithering. The power added due to dithering is an important aspect of this approach and gives raise to investigations on addit...
Preprint
Full-text available
This letter proposes a deep learning approach for detecting a change in transmitters' or receivers' antenna orientation as a physical tamper attack in OFDM systems using channel state information. We treat the physical tamper attack problem as a semi-supervised anomaly detection problem and utilize a deep convolutional autoencoder (DCAE) to tackle...
Conference Paper
Full-text available
Due to its scalability, tuneability, low latency and high linearity, the radio frequency digital to analog converter (RFDAC) is shown to be an attractive choice for the transmitter architecture for the long term evolution (LTE) and new radio (NR) standards, especially for the sub 8 GHz frequency range. When placing several transmitters (TX) and rec...
Preprint
Full-text available
A continually growing number of sensors is required for monitoring industrial processes and for continuous data acquisition from industrial plants and devices. The cabling of sensors represent a considerable effort and potential source of error, which can be avoided by using wireless sensor nodes. These wireless sensor nodes form a wireless sensor...
Article
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We present a simple, stable, and highly reproducible off-chip-controlled method for generating droplets-on-demand. To induce the droplet generation, externally pre-programmed positive pressure pulses are applied to the dispersed phase input while the continuous phase channel remains at constant input pressure. By controlling solely one fluid phase,...
Conference Paper
Full-text available
We propose to add a monitoring system consisting of so-called path- and guard nodes to industrial wireless sensor network (IWSN), to increase the security level by using RSSI measurements. Via these measurements, the monitoring system determines the presence of a mobile sensor node in a predefined area, which can be used to handle access rights and...
Article
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Cellular standards evolve to support increasingly higher bandwidths which results in strict in- and out-of-band requirements such as lower error vector magnitude (EVM) and/or adjacent channel leakage ratio (ACLR). Digital polar transmitters, which are showing the best performance in terms of power consumption, are challenged to fulfill these requir...
Article
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This article provides an overview on the emerging field of droplet-based microfluidic networks. In such networks, droplets i.e., encapsulating biochemical samples can be adaptively transported via microchannels through different operations for particular experiments. This approach is particularly promising for the next generation of lab-on-a-chip d...
Chapter
Offering many fundamental and practical advantages of relevance for today’s chemical and biological industry, microreactors are rapidly replacing round-bottomed flasks in modern biochemical labs. Compared to the batch processing, microreactors can offer precise control of reaction variables, high-throughput scanning of reaction conditions, increase...
Chapter
Preface Our future is the world we are going to live in, attracting our fantasies, speculations, fears and hopes. We really would like to know something about it and want to be prepared. Therefore, we observe trends. An obvious trend is that our world gets more and more connected. Information is seamlessly following and doing this quickly. We learn...
Article
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Smart transducers based on ISO/IEC/IEEE 21450 provide standardized access to sensors and actuators. Hence, no centralized database is needed for the calibration and interpretation of the data collected by transducers. The smart transducer stores and maintains its individual transducer electronic data sheet (TEDS). Whenever transducers are replaced...
Conference Paper
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In this paper, an overview of different RF transmitter architectures, based on the RF-DAC implementation is given. The evolution of different types of architectures is displayed with the explanation of the main advantages and limitations and/or challenges of each architecture in usage for today's and future cellular handset-applications. The block...
Conference Paper
In this work, we practically realize and investigate various information encoding schemes for droplet-based microfluidic systems. First, we introduce different approaches for representing information using droplets. Then, the most promising approaches are practically tested using fabricated microfluidic chips. Finally, the encoding methodologies ar...
Conference Paper
Full-text available
Zusammenfassung Zur Überwachung von industriellen Prozessen und zur laufenden Messdatenerfassungen von Indust-rieanlagen und-Geräten werden immer mehr und mehr Sensoren benötigt. Diese Entwicklung wird vor allem durch industrielle Internet-of-Things (IoT) Anwendungen gleichzeitig ermöglicht und voran-getrieben. Die Verkabelung stellt einen erheblic...
Article
In wireless communications, knowledge of the radio channel is essential for channel equalization at the receiver side. Time-variant frequency-selective (doubly-selective) radio channels are typically tracked over time by using basis expansion model (BEM). The BEM models time variations by using the Doppler bandwidth, caused by the relative movement...
Article
A precise decentralized clock synchronization method, referred to as Integrated Cooperative Synchronization (ICS) is proposed in this letter. ICS is a delay compensating method that relies on mean-field (MF) message passing, where the measurement phase is integrated into the message passing phase. By selecting an extended factorization of the under...
Conference Paper
Full-text available
In this paper a linear, code-dependent model for drain efficiency estimation of radio-frequency switched-capacitor power amplifiers in back-off operation mode is presented. Given a certain modulation scheme this model provides an estimation for output power and drain efficiency in back-off operation, which enables comparison between different modul...
Article
Two-phase flow microfluidics is a promising platform for realizing Lab-on-a-Chip (LoC) devices, that perform different laboratory functions on a single chip. This is accomplished by processing droplets, containing biological/chemical samples, by different elements each performing specific operations. Usually, the sequence of elements in which dropl...
Article
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Transposition errors fundamentally undermine reliability and capacity in molecular communication, when individual particles are used for information encoding. Recently, several channel coding techniques have been proposed for mitigating the transposition effect. The presented techniques show promising results for diffusion-based channels with drift...
Conference Paper
In this work, we investigate passive droplet routing in microfluidic bus networks as a promising approach for realizing programmable and flexible microfluidic devices. Two main concepts for passive droplet routing have been established in the past: switching by distance and switching by size. In this work, we deliver a unified analysis and comparis...
Article
In this work we propose a secure communication concept for the protection of critical power supply and distribution infrastructure. Especially, we consider the line current differential protection method for modern smart grid implementations. This protection system operates on critical infrastructure, and it requires a precise time behavior on the...
Preprint
Full-text available
In this work, we consider diffusion-based molecular communication with and without drift between two static nano-machines. We employ type-based information encoding, releasing a single molecule per information bit. At the receiver, we consider an asynchronous detection algorithm which exploits the arrival order of the molecules. In such systems, tr...
Article
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A novel digital-intensive hybrid transmitter (TX) architecture is presented, combining conventional inphase and quadrature (I/Q) with constrained phase modulation. The proposed architecture utilizes an RF-DAC with phase modulated RF clock and adjusted I/Q components. By incorporating phase modulation the quadrature component is kept small while the...
Article
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Spatial modulation (SM) and generalized spatial modulation (GSM) are emerging multiple input multiple output (MIMO) schemes that use transmitter (TX) antenna switching for data transmission. Their operating principle makes optimization of channel capacity and mutual information usually more difficult than for conventional MIMO schemes which are not...
Conference Paper
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In this paper a state-space approach for modeling radio-frequency digital-to-analog-converters is presented. We explain the root cause of the sign-change error appearing in RF-DAC architectures with local oscillator (LO) switching and present its impact in time domain and on the spectrum of the output RF signal. The main contribution of this paper...
Article
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A multirate fractional-N RF digital phase-locked loop (DPLL) phase modulator implementation for polar transmitter supporting cellular communication standards up to 4G LTE-A is demonstrated. The RF-DPLL integrates LC-tank-based digital-controlled oscillator (DCO) cores with Σ-Δ-noise shaping and fractional sample rate conversion to account for a bro...
Article
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This article presents an overview of the major trends and challenges involved with the design of multi-band, multi-standard digitally-intensive radio frequency transceivers for next generation mobile communications. In addition, we discuss in detail one aspect of the implementation challenges, namely the occurrence and cancellation of self-interfer...
Article
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In this letter, we investigate the extrinsic log-likelihood ratio (LLR) computation of a soft-input soft-output equalizer used in a turbo equalization system. The optimum LLRs are obtained by a maximum a posteriori based equalizer, which may be computationally expensive. Thus, several reduced-complexity equalizers have been proposed. The most promi...
Conference Paper
This work demonstrates a complete setup of a distributed LoRaWAN-based data-acquisition system where individual LoRa end-devices can be supervised by a remote debugging environment. We present the whole chain of data processing from an embedded Indoor Air Quality (IAQ) monitoring sensor in the field up to the data-storage and visualization for huma...
Article
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This paper shows the generation of a local oscillator (LO) signal for cellular transceivers by means of a phase-locked loop and a phase interpolator (PI) digital-to-time converter (DTC). The PI-DTC allows arbitrary frequency shifts over a wide range. We derive a closed-form description of the spurs in the spectrum of the LO signal caused by quantiz...
Article
Full-text available
In this paper, we study the capacity and symbol error probability (SEP) of generalized spatial modulation (GSM) multiple-input multiple-output (MIMO) using measured channels that are obtained by channel sounding in an indoor office environment at 60 GHz. Spatial modulation (SM) and GSM are emerging low-complexity MIMO schemes that have been extensi...
Conference Paper
Labs-on-Chip integrate and minimize the functionality of complete conventional laboratories on a single chip. An upcoming and especially biocompatible realization are Networked Labs-on-Chips (NLoCs). In NLoCs, small volumes of reagents, so-called droplets, flow in an immiscible fluid in closed channels. An external pump applies a force to this immi...