@inproceedings{24059,
  abstract     = {{We present a complete Visible Light Communication (VLC) system for experimental Vehicular VLC (V-VLC) research activities. Visible light is becoming an important technology complementing existing Radio Frequency (RF) technologies such as Cellular V2X (C-V2X) and Dedicated Short Range Communication (DSRC). In this scope, first works helped introducing new simulation models to explore V-VLC capabilities, technologies, and algorithms. Yet, experimental prototypes are still in an early phase. We aim bridging this gap with our system, which integrates a custom-made driver hardware, commercial vehicle light modules, and an Open Source signal processing implementation in GNU Radio, which explicitly offers rapid prototyping. Our system supports OFDM with a variety of Modulation and Coding Schemes (MCS) and is compliant to IEEE 802.11; this is in line with the upcoming IEEE 802.11 LC standard as well. In an extensive series of experiments, we assessed the communication performance by looking at realistic inter vehicle distances. Our results clearly show that our system supports even higher order MCS with very low error rates over long distances.}},
  author       = {{Amjad, Muhammad Sohaib and Tebruegge, Claas and Memedi, Agon and Kruse, Stephan and Kress, Christian and Scheytt, Christoph and Dressler, Falko}},
  booktitle    = {{IEEE International Conference on Communications (ICC)}},
  pages        = {{1--6}},
  publisher    = {{ICC 2019 - 2019 IEEE International Conference on Communications (ICC)}},
  title        = {{{An IEEE 802.11 Compliant SDR-Based System for Vehicular Visible Light Communications}}},
  doi          = {{10.1109/ICC.2019.8761960}},
  year         = {{2019}},
}

@inproceedings{24048,
  abstract     = {{This paper presents an area-efficient 19.25 GHz to 77 GHz frequency quadrupler for automotive radar applications. To reduce chip area, the delay lines of each doubler stage have been drastically shrunk by means of meandering, slow wave structures, and capacitive loading. Additional circuit techniques were applied to further reduce chip area. Compared to previously published Gilbert cell frequency multipliers the presented quadrupler achieves the shortest electrical length of the delay lines reported so far allowing for compact, low-cost radar transceivers. The chip was implemented in a IHP 130nm SiGe BiCMOS technology (f T /f max =240/340GHz). It dissipates 91.5mW from a 3.3V supply.}},
  author       = {{Kruse, Stephan}},
  booktitle    = {{IEEE MTT-S International Microwave and RF Conference 2019}},
  publisher    = {{IEEE}},
  title        = {{{An Area Efficient 19.25 GHz to 77 GHz Gilbert Cell Frequency Quadrupler with 55% Shrinked Delay Lines in 130nm SiGe BiCMOS }}},
  doi          = {{10.1109/IMaRC45935.2019.9118726}},
  year         = {{2019}},
}

@article{24056,
  abstract     = {{Source-free all optical sampling, based on the convolution of the signal spectrum
with a frequency comb in an electronic-photonic, co-integrated silicon device will be presented
for the first time, to the best of our knowledge. The method has the potential to achieve very high
precision, requires only low power and can be fully tunable in the electrical domain. Sampling
rates of three and four times the RF bandwidths of the photonics and electronics can be achieved.
Thus, the presented method might lead to low-footprint, fully-integrated, precise, electrically
tunable, photonic ADCs with very high-analog bandwidths for the digital infrastructure of
tomorrow.}},
  author       = {{Misra, Arijit and Kress, Christian and Singh, Karanveer and Preussler, Stefan and Scheytt, Christoph and Schneider, Thomas}},
  journal      = {{Opt. Express}},
  number       = {{21}},
  pages        = {{29972--29984}},
  title        = {{{Integrated source-free all optical sampling with a sampling rate of up to three times the RF bandwidth of silicon photonic MZM}}},
  doi          = {{10.1364/OE.27.029972}},
  volume       = {{27}},
  year         = {{2019}},
}

@inproceedings{24054,
  abstract     = {{Optical sampling of pseudo random microwave signals with sinc-shaped Nyquist pulse sequences has been demonstrated in an integrated silicon photonics platform. An electronic-photonic, co-integrated depletion type silicon intensity modulator with high extinction ratio has been used to sample the microwave signal with a sampling rate, which corresponds to three times its RF bandwidth. Thus, a sampling rate of 21 GSa/s is achieved with a 7 GHz modulator, with 3 dBm of differential input power.}},
  author       = {{Misra, Arijit and Kress, Christian and Singh, Karanveer and Preussler, Stefan and Scheytt, Christoph and Schneider, Thomas}},
  booktitle    = {{2019 International Topical Meeting on Microwave Photonics (MWP)}},
  pages        = {{1--4}},
  title        = {{{Integrated All Optical Sampling of Microwave Signals in Silicon Photonics}}},
  doi          = {{10.1109/MWP.2019.8892128}},
  year         = {{2019}},
}

@misc{8482,
  author       = {{Jurgelucks, Benjamin and Schulze, Veronika and Feldmann, Nadine and Claes, Leander}},
  title        = {{{Arbitrary sensitivity for inverse problems in piezoelectricity}}},
  year         = {{2019}},
}

@inproceedings{12952,
  author       = {{Dreiling, Dmitrij and Feldmann, Nadine and Henning, Bernd}},
  keywords     = {{piezoelectric materials, piezoelectric properties, DC bias field, non-linear material parameters}},
  location     = {{Nürnberg}},
  publisher    = {{AMA Service GmbH}},
  title        = {{{A DC bias approach to the characterisation of non-linear material parameters of piezoelectric ceramics}}},
  doi          = {{10.5162/sensoren2019/5.1.2}},
  year         = {{2019}},
}

@inproceedings{24186,
  abstract     = {{A 2nd transconductance subharmonic receiver for 245 GHz spectroscopy sensor applications has been proposed. The receiver consists of a 245 GHz on-chip folded dipole antenna, a CB (common base) LNA, a 2nd transconductance SHM (subharmonic mixer), and a 120 GHz push-push VCO with 1/64 divider. The receiver is fabricated in fT/fmax = 300/500 GHz SiGe:C BiCMOS technology. The receiver dissipates a low power of 288 mW. Integrated with the on-chip antenna, the receiver is measured on-chip with a conversion gain of 15 dB, a bandwidth of 15 GHz, and the chip will be utilized in PCB board design for gas spectroscopy sensor application.}},
  author       = {{Mao, Yanfei and Shiju, E. and Schmalz, Klaus and Scheytt, Christoph}},
  booktitle    = {{Journal of Semiconductors}},
  title        = {{{245 GHz Subharmonic Receiver With Onchip Antenna for Gas Spectroscopy Application}}},
  year         = {{2018}},
}

@inproceedings{24192,
  abstract     = {{The terahertz frequency range provides abundant bandwidth (25GHz ~ 50 GHz) to achieve ultra-high-speed wireless communication and enables data rates up to and above 100 Gbps. We choose Parallel Sequence Spread Spectrum (PSSS) as an analog friendly modulation and coding scheme that allows for an efficient mixed-signal implementation of a 100 Gbps wireless communication system. In our system design, we require a DAC (Digital to Analog converters) running at 1.67 G symbols/sec. The optimization of the bit resolution of this DAC will considerably reduce the hardware implementation efforts. In this work, we presented the analytical model for PSSS modulation and deduced a mathematical formula to calculate the number of discrete level amplitudes along with their probability distribution appearing at the output of the PSSS modulated signal. The analytical analysis assists in predicting the number of the quantization level of the DAC needed at the PSSS transmitter. The theoretical analysis shows that there are in total 225 discrete levels at the output of the PSSS encoder which leads to an 8-bit resolution of DAC. In this paper, we analyzed the variation of BER (Bit Error Rate) to the clipping of low probability amplitude levels and found that there is an only slight increase of the BER when we clip off the low probability amplitude levels. Thus, there is a tradeoff involved in a minor growth of BER concerning the reduction of the DAC bit resolution. Finally, we can reduce the DAC bit resolution from 8 bits to 7 bits and thus simplify the hardware implementation efforts of DAC operating at 1.67 Gbps.}},
  author       = {{Karthik, KrishneGowda and Wimmer, Lara and Javed, Abdul Rehman and Wolf, Andreas and Scheytt, Christoph and Kraemer, Rolf}},
  booktitle    = {{15th International Symposium on Wireless Communication Systems (ISWCS) }},
  location     = {{Lisbon, Portugal }},
  publisher    = {{IEEE}},
  title        = {{{Analysis of PSSS modulation for optimization of DAC bit resolution for 100 Gbps systems}}},
  doi          = {{10.1109/ISWCS.2018.8491216}},
  year         = {{2018}},
}

@article{24194,
  author       = {{Adelt, Peer and Koppelmann, Bastian and Müller, Wolfgang}},
  journal      = {{International Workshop on RISC-V Research Activities}},
  location     = {{Munich, DE}},
  title        = {{{Current and Future RISC-V Activities for Virtual Prototyping and Chip Design}}},
  volume       = {{Presentation}},
  year         = {{2018}},
}

@inproceedings{24195,
  abstract     = {{This paper demonstrates system level analysis of an energy efficient Radio Frequency (RF) receiver. The receiver is based on a Surface Acoustic Wave (SAW) correlator which is used for highly linear demodulation and interferer suppression in conjunction with envelope detection for ultra-low power dissipation and hardware efficiency. The receiver is to be used in Wireless Sensor Networks (WSN) as a Wake-up Receiver (WuR) to reduce the network nodes power dissipation and provide asynchronous data communication. Low latency and high interference robustness makes this scheme interesting for industrial real-time applications. In this paper, the SAW correlator transfer function is derived, which functions as a Matched Filter (MF). Since the receiver uses envelope detection and based on the characteristic of the SAW, the receiver sensitivity is analyzed by means of a non-linear approach.}},
  author       = {{Abughannam, Saed and Scheytt, Christoph}},
  booktitle    = {{2nd URSI AT-RASC}},
  pages        = {{1--4}},
  publisher    = {{IEEE}},
  title        = {{{System Analysis of a Wake-Up Receiver Based on Surface Acoustic Wave Correlator}}},
  doi          = {{10.23919/URSI-AT-RASC.2018.8471531}},
  year         = {{2018}},
}

@inproceedings{24196,
  abstract     = {{This paper presents an approach for analog fault effect simulation automation based on random fault selection with a high fault coverage of the circuit under test by means of fault injection and simulation based on advanced sampling techniques. The random fault selection utilizes the likelihood of the fault occurrence of different electrical components in the circuit with a confidence level. Defect models of different devices are analyzed for the calculation of the fault probability. A case study with our implemented tool demonstrates that likelihood calculation and fault simulation provides means for efficient fault effect simulation automation.}},
  author       = {{Wu, Liang and Hussain, Mohammad Khizer and Abughannam, Saed and Müller, Wolfgang and Scheytt, Christoph and Ecker, Wolfgang}},
  booktitle    = {{2018 13th International Conference on Design & Technology of Integrated Systems In Nanoscale Era (DTIS)) }},
  publisher    = {{IEEE}},
  title        = {{{Analog fault simulation automation at schematic level with random sampling techniques}}},
  doi          = {{10.1109/DTIS.2018.8368549}},
  year         = {{2018}},
}

@misc{24198,
  author       = {{Scheytt, Christoph and Wu, Liang}},
  title        = {{{Integrier‐ und Halte‐Schaltung }}},
  year         = {{2018}},
}

@inproceedings{24199,
  abstract     = {{This work describes a dielectric sensing system applying a 120 GHz electrical interferometer for contactless permittivity measurements. The applied IC was fabricated in a 130 nm SiGe process featuring an ft and fmax of 240 GHz and 330 GHz. The on-chip system contains a 120 GHz VCO with a tuning range of 7 GHz featuring a divide-by-64 circuit to enable external PLL operation. An important feature of the IC is high-precision and high-resolution phase shifting based on a slow-wave transmission lines approach with digital control. This allows for direct digital readout ability. The on chip power detector provides DC output signals giving the opportunity to record transfer functions of the interferometer. It enables sample emulation capability by phase shift inducement in the measurement as well as a reference transmission line. The motherboard of the system provides PLL stabilization for frequency sweeps. The proposed approach is capable of automated dielectric monitoring by phase compensation.}},
  author       = {{Wessel, Jan and Schmalz, Klaus and Scheytt, Christoph and Kissinger, Dietmar}},
  booktitle    = {{2018 IEEE Radio and Wireless Symposium (RWS)}},
  issn         = {{2164-2974 }},
  publisher    = {{IEEE}},
  title        = {{{Sensitive permittivity detector for dielectric samples at 120 GHz}}},
  doi          = {{10.1109/RWS.2018.8304967}},
  year         = {{2018}},
}

@inproceedings{3588,
  abstract     = {{In scientific computing, unstructured meshes are a crucial foundation for the simulation of real-world physical phenomena. Compared to regular grids, they allow resembling the computational domain with a much higher accuracy, which in turn leads to more efficient computations.<br />There exists a wealth of supporting libraries and frameworks that aid programmers with the implementation of applications working on such grids, each built on top of existing parallelization technologies. However, many approaches require the programmer to introduce a different programming paradigm into their application or provide different variants of the code. SYCL is a new programming standard providing a remedy to this dilemma by building on standard C ++17 with its so-called single-source approach: Programmers write standard C ++ code and expose parallelism using C++17 keywords. The application is<br />then transformed into a concrete implementation by the SYCL implementation. By encapsulating the OpenCL ecosystem, different SYCL implementations enable not only the programming of CPUs but also of heterogeneous platforms such as GPUs or other devices. For the first time, this paper showcases a SYCL-<br />based solver for the nodal Discontinuous Galerkin method for Maxwell’s equations on unstructured meshes. We compare our solution to a previous C-based implementation with respect to programmability and performance on heterogeneous platforms.<br}},
  author       = {{Afzal, Ayesha and Schmitt, Christian and Alhaddad, Samer and Grynko, Yevgen and Teich, Jürgen and Förstner, Jens and Hannig, Frank}},
  booktitle    = {{Proceedings of the 29th Annual IEEE International Conference on Application-specific Systems, Architectures and Processors (ASAP)}},
  isbn         = {{978-1-5386-7479-6}},
  keywords     = {{tet_topic_hpc}},
  pages        = {{49--56}},
  title        = {{{Solving Maxwell's Equations with Modern C++ and SYCL: A Case Study}}},
  doi          = {{10.1109/ASAP.2018.8445127}},
  year         = {{2018}},
}

@article{3740,
  abstract     = {{Oblique propagation of semi-guided waves across slab waveguide structures with bent corners is investigated. A critical angle can be defined beyond which all radiation losses are suppressed. Additionally an increase of the curvature radius of the bends also leads to low-loss configurations for incidence angles below that critical angle. A combination of two bent corner systems represents a step-like structure, behaving like a Fabry-Perot interferometer, with two partial reflectors separated by the vertical height between the horizontal slabs. We numerically analyse typical high-index-contrast Si/SiO2 structures for their reflectance and transmittance properties. When increasing the curvature radius the resonant effect becomes less relevant such that full transmittance is reached with less critical conditions on the vertical distance or the incidence angle. For practical interest 3-D problems are considered, where the structures are excited by the fundamental mode of a wide, shallow rib waveguide. High transmittance levels can be observed also for these 3-D configurations depending on the width of the rib.}},
  author       = {{Ebers, Lena and Hammer, Manfred and Förstner, Jens}},
  journal      = {{Optics Express}},
  keywords     = {{tet_topic_waveguide}},
  number       = {{14}},
  pages        = {{18621--18632}},
  publisher    = {{OSA Publishing}},
  title        = {{{Oblique incidence of semi-guided planar waves on slab waveguide steps: effects of rounded edges}}},
  doi          = {{10.1364/OE.26.018621}},
  volume       = {{26}},
  year         = {{2018}},
}

@inproceedings{18107,
  author       = {{Heymann, Jahn and Bacchiani, M. and Sainath, T. N.}},
  booktitle    = {{2018 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}},
  pages        = {{6722--6726}},
  title        = {{{Performance of Mask Based Statistical Beamforming in a Smart Home Scenario}}},
  doi          = {{10.1109/ICASSP.2018.8462372}},
  year         = {{2018}},
}

@inproceedings{8085,
  author       = {{Obeng-Akrofi, George and Oppong Akowuah, Joseph and Opoku-Agyemang, Gifty and Nkrumah, Isaac and Donkor, Micheal  K. E. and Tamakloe, Reuben Y. and Ampong, Francis K. and Klaus, Tobias and Krauter, Stefan and Waldhoff, Maike and Olenberg, Alexander and Kenig, Eugeny}},
  booktitle    = {{Proceedings of SWC2017/SHC2017}},
  isbn         = {{9783981465976}},
  publisher    = {{International Solar Energy Society}},
  title        = {{{An Automated Solar-Biomass Hybrid Dryer System for Rural Communities in Ghana}}},
  doi          = {{10.18086/swc.2017.26.10}},
  year         = {{2018}},
}

@misc{4576,
  author       = {{Sprenger, Alexander and Hellebrand, Sybille}},
  keywords     = {{WORKSHOP}},
  publisher    = {{30. Workshop "Testmethoden und Zuverlässigkeit von Schaltungen und Systemen" (TuZ'18)}},
  title        = {{{Stochastische Kompaktierung für den Hochgeschwindigkeitstest}}},
  year         = {{2018}},
}

@inproceedings{4579,
  abstract     = {{Semi-guided waves confined in dielectric slab waveguides are being considered for oblique angles of propagation. If the waves encounter a linear discontinuity of (mostly) arbitrary shape and extension, a variant of Snell's law applies, separately for each pair of incoming and outgoing modes. Depending on the effective indices involved, and on the angle of incidence, power transfer to specific outgoing waves can be allowed or forbidden. In particular, critical angles of incidence can be identified, beyond which any power transfer to non-guided waves is forbidden, i.e. all radiative losses are suppressed. In that case the input power is carried away from the discontinuity exclusively by reflected semi-guided waves in the input slab, or by semi-guided waves that are transmitted into other outgoing slab waveguides. Vectorial equations on a 2-D cross sectional domain apply. These are formally identical to the equations that govern the eigenmodes of 3-D channel waveguides. Here, however, these need to be solved not as an eigenvalue problem, but as an inhomogeneous problem with a right-hand-side that is given by the incoming semi-guided wave, and subject to transparent boundary conditions. The equations resemble a standard 2-D Helmholtz problem, with an effective permittivity in place of the actual relative permittivity. Depending on the properties of the incoming wave, including the angle of incidence, this effective permittivity can become locally negative, causing the suppression of propagating outgoing waves. A series of high-contrast example configurations are discussed, where these effects lead to - in some respects - quite surprising transmission characteristics.}},
  author       = {{Hammer, Manfred and Ebers, Lena and Hildebrandt, Andre and Alhaddad, Samer and Förstner, Jens}},
  booktitle    = {{2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)}},
  isbn         = {{9781538654385}},
  keywords     = {{tet_topic_waveguides}},
  publisher    = {{IEEE}},
  title        = {{{Oblique Semi-Guided Waves: 2-D Integrated Photonics with Negative Effective Permittivity}}},
  doi          = {{10.1109/mmet.2018.8460455}},
  year         = {{2018}},
}

@inproceedings{4581,
  author       = {{Grynko, Yevgen and Förstner, Jens}},
  booktitle    = {{2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)}},
  isbn         = {{9781538654385}},
  keywords     = {{tet_topic_numerics, tet_topic_shg}},
  publisher    = {{IEEE}},
  title        = {{{Application of the Discontinuous Galerkin Time Domain Method in Nonlinear Nanoplasmonics}}},
  doi          = {{10.1109/mmet.2018.8460261}},
  year         = {{2018}},
}