Andreas Frotzscher

• Dr.-Ing.
• Manager at Fraunhofer Institute for Integrated Circuits

Time series clustering is an unsupervised method of organizing homogeneous time series in groups based on certain similarity criteria. As a result, it can be an essential step in Exploratory Data Analysis (EDA), especially for complex time series data. This applies specifically to industrial datasets for applications like predictive maintenance, en...

Multivariate time series (MTS) are captured in a great variety of real-world applications. However, analysing and modeling the data for classification and forecasting purposes can become very challenging if values are missing in the data set. The need for imputation methods, to fill the gaps in MTS, is well known. Thus, a great variaty of algorithm...

p>Multivariate time series (MTS) are captured in a great variety of real-world applications. However, analysing and modelling the data for classification and forecasting purposes can become very challenging if values are missing in the data set. The need for imputation methods, to fill the gaps in MTS, is well known. Thus, a great variaty of algori...

p>Multivariate time series (MTS) are captured in a great variety of real-world applications. However, analysing and modelling the data for classification and forecasting purposes can become very challenging if values are missing in the data set. The need for imputation methods, to fill the gaps in MTS, is well known. Thus, a great variaty of algori...

In unserer Fachdisziplin bezeichnen wir komplexe technische Systeme als resilient, wenn sie auch beim Auftreten innerer und äußerer Ausfälle und Störungen die angeforderten Systemleistungen aufrechterhalten. Hier sind alle Ingenieurdisziplinen und insbesondere die Automation gefragt, denn eines ist offensichtlich: Die Herausforderungen können wir n...

Inhalt (Auszüge…) Fertigungsautomation – Plant Lifecycle Management Multidimensionale Datenmodellierung und Analyse zur Qualitätssicherung in der Fertigungsautomatisierung . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 B. Lindemann, N. Jazdi, M. Weyrich, Institut für Automatisierungstechnik und Softwar...

The ever-growing proliferation of wireless devices and technologies used for Internet of Things (IoT) applications, such as patient monitoring, military surveillance, and industrial automation and control, has created an increasing need for methods and tools for connectivity prediction, information flow monitoring, and failure analysis to increase...

Die Digitalisierung der Gesellschaft und Industrie schreitet unaufhörlich voran, und die Bedeutung des Zugangs zu uneingeschränkter mobiler Vernetzung für unser gesellschaftliches und berufliches Leben nimmt somit ebenfalls stetig zu. Mit der Entwicklung der 5G Mobilfunkgeneration, aber auch echtzeitfähiger lokaler Funknetze werden in Zukunft digit...

In this paper we give an overview of the German project cluster FAST which targets a technical breakthrough by real-time with latencies below 1 ms to enable advanced applications in the area of connectivity, traffic, manufacturing and health. FAST is based on 25 technical projects conducted by over 80 partners in industry and research. The innovati...

The industrial wireless automation sector exhibits a huge market growth in the last years. Today, many appli-cations already use wireless technologies. However, the existing wireless solutions do not yet offer sufficient performance with respect to real-time and reliability requirements, particularly for closed-loop control applications. As a resul...

Wireless solutions in industrial automation appli-cations must meet high requirements regarding reliability and latency. The preferred usage of the license-free 2.4 GHz ISM frequency band bears the risk of error-prone coexistence of various wireless networks within a production site and could result in system failures. This represents a significant...

This paper presents new architectures for RF pulse width modulation (RF-PWM) that allow for efficient implementation. For the 2.6Ghz band the modulator can now be built with standard components. The concepts support binary and M-ary output alphabets. One variant is capable of generating M-ary RF-PWM signals deploying one switching device only. The...

Transmitter leakage (TxL) has a significant impact on the performance of frequency division duplex devices using zero-IF receivers and thus requires a suitable compensation. In contrast to analog approaches, digital TxL compensation approaches can easily be reconfigured and therefore are highly attractive for multiband mobile devices. In this contr...

In this paper, we present a novel so-called class-O distributed base station system where the remote unit and the central unit are connected via an optical link. In contrast to existing systems, we transmit a binary RF signal over the optical link which significantly reduces the complexity of the remote unit. The conversion from an analog to a bina...

Transmitter Leakage has a significant impact on the system performance in mobile devices using zero-IF receivers and thus requires a suitable compensation. In contrast to analog approaches, digital Tx Leakage compensation approaches can easily be reconfigured and therefore are highly attractive for future mobile devices, using software defined radi...

Transmitter Leakage has a significant impact on zero-IF transceivers for mobile FDD terminals and therefore must be compensated. When Tx Leakage compensation approaches are designed, their capability to adapt to changing leakage conditions must be specified. Therefore, in this contribution we analyse the time variance of Tx Leakage considering the...

Transmitter leakage has a significant impact on the system performance in mobile devices using zero-IF receivers and thus requires a suitable compensation. In contrast to analog approaches, digital Tx leakage compensation approaches can easily be reconfigured and therefore are highly attractive for future mobile devices, using software defined radi...

Transmitter leakage has a significant impact on the system performance in mobile devices using zero-IF receivers. In contrast to analog approaches, digital Tx leakage compensation approaches can easily be reconfigured and therefore are highly attractive for future mobile devices, using software defined radios. In this contribution we present a digi...

Transmitter Leakage has a significant impact on the system performance in mobile devices using zero-IF receivers. In this contribution, the statistical properties of the Tx Leakage impact in zero-IF receivers are derived, in the context of Uplink and Downlink OFDM transmission. In order to design suitable algorithms for the digital compensation of...

Phase Noise (PN) is a serious challenge in wireless transmission systems as it can cause significant degradation of the system performance. Recent publications propose iterative PN compensation algorithms for single or multicarrier systems. In this paper we will present an unscented Kalman filter PN tracking algorithm working in time domain, which...

In frequency division duplex transceivers the transmit signal is leaking through the duplexer into the receive branch. For the case of zero-IF receivers the nonlinearity of the I/Q down converter generates 2nd order intermodulation products of the transmitter leakage, causing severe interference to the desired receive signal in the baseband. In thi...

Frequency division duplex transceivers employing the zero-if principle suffers from Tx leakage. In this contribution a baseband representation of the Tx leakage impact in zero-if receivers is derived and the statistical properties of the involved baseband signals are analysed. Additionally requirements on the digital compensation of Tx leakage are...

Transmitter Leakage has a significant impact on frequency division duplex transceivers in mobile devices using zero-IF receivers. In this contribution, the statistical properties of the Tx Leakage impact in zero-IF receivers is derived, in the concept of Uplink and Downlink OFDM transmission. In order to design suitable algorithms for the digital c...

A major drawback of the orthogonal frequency division multiplex (OFDM) principle is the high dynamic range of the transmit signal. The transmit power amplifier (PA) and other elements in the signal path have to operate at high input power backoff (IBO), which decreases the efficiency of the PA and leads to higher costs. This paper presents a novel...