Search

Your search keyword '"A. Kuhn"' showing total 2,970 results
Start Over Author "A. Kuhn" Publisher ieee
2,970 results on '"A. Kuhn"'

1. Full-Field Through-Chip IR-Thermography-based Quality Testing & Failure Analysis on Electroplated Aluminium Interconnects for Cryogenic Applications in Ion-Trap Quantum Computers

Author

May, D., primary, Wunderle, B., additional, Cirulis, I., additional, Braun, S., additional, Zschenderlein, U., additional, Heilmann, J., additional, Pantou, R., additional, Schacht, R., additional, Rzepka, R., additional, Ras, M. Abo, additional, Kurth, S., additional, and Kuhn, H., additional

Published
2024
Full Text
View/download PDF

2. SDR-based demonstration system and applicability of SNR aggregation for multistage distributed cooperative communication in MANETs

Author

Yüksel, Mus'ab, Rolny, Raphael T. L., Kuhn, Marc, Kuhn, Michael, Yüksel, Mus'ab, Rolny, Raphael T. L., Kuhn, Marc, and Kuhn, Michael

Abstract

Multistage or hierarchical distributed cooperative communication on the physical layer is a promising approach to overcome the scalability limitation of Mobile Ad-hoc Networks (MANETs). Standalone nodes that could successfully decode messages join transmission and support each other. They become a virtual transmit cluster and send simultaneously. While information theoretic research has demonstrated that an approximately linear scaling behaviour can be achieved, imperfections and constraints of practical systems have not been taken into account. Within this paper, we present a scalable and modular low-cost demonstration system based on software-defined radios (SDRs) to study distributed cooperative communication in practical MANETs. Furthermore, we apply SNR aggregation in combination with distributed cooperative transmission. To this end, we show a practical implementation approach and investigate the performance by measurements and simulations. Our results clearly highlight the advantages of combining distributed cooperative communication and SNR aggregation, e. g. to overcome larger distances in a distributed long haul multiple-input single-output (MISO) scenario or to enable a more efficient broadcast.

Published
2023

3. Distributed cooperative transmission in MANETs with multiple timing and carrier frequency offsets

Author

Yüksel, Mus'ab, Rolny, Raphael, Kuhn, Marc, Kuhn, Michael, Yüksel, Mus'ab, Rolny, Raphael, Kuhn, Marc, and Kuhn, Michael

Abstract

Cooperative transmission is a promising approach to establish robust communication in Mobile Ad-Hoc Networks (MANETs). In low-complexity MANETs several transmitters (TX) can be aggregated to a virtual multiple input system. For such a setup, the impact of various timing and carrier frequency offsets (TO, CFO) has to be mitigated. We propose an effective, purely time-domain based equalizer structure that allows to establish cooperative transmission with a transmit diversity scheme in presence of aforementioned impairments and multipath channels. Exemplarily investigating the broadcast performance by outage simulations in a MANET scenario, we can demonstrate the benefits and indicate that the proposed structure is auspicious to improve the general scalability of MANETs.

Published
2023

19. Optimized Multicore Fiber Designs for Coherent Combination

Author

Jauregui, Cesar, primary, Klenke, Arno, additional, Steinkopff, Albrecht, additional, Aleshire, Chistopher, additional, Bahri, Mehran, additional, Nold, Johannes, additional, Kuhn, Stefan, additional, Haarlammert, Nicoletta, additional, Schreiber, Thomas, additional, and Limpert, Jens, additional

Published
2023
Full Text
View/download PDF

21. Coherently Combined High Power Multicore Fibers

Author

Limpert, Jens, primary, Klenke, Arno, additional, Steinkopf, Albrecht, additional, Aleshire, Chistopher, additional, Bahri, Mehran, additional, Nold, Johannes, additional, Kuhn, Stefan, additional, Haarlammert, Nicoletta, additional, Schreiber, Thomas, additional, and Jauregui, Cesar, additional

Published
2023
Full Text
View/download PDF

26. Applicability of Space-Time Block Codes for distributed cooperative broadcasting in MANETs with high node mobility

Author

Yüksel, Mus'ab, Rolny, Raphael, Kuhn, Marc, Kuhn, Michael, Yüksel, Mus'ab, Rolny, Raphael, Kuhn, Marc, and Kuhn, Michael

Abstract

​© 2022 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works., Mobile Ad-Hoc Networks (MANETs) are often characterized by high node mobility and rapid topology changes which in turn can cause high packet loss rates. In order to cope with this, MANETs typically rely on routing algorithms that try to efficiently distribute messages in the entire network. Such routing schemes introduce an overhead that limits the scalability of MANETs with respect to the number of nodes and/or mobility. Cooperative communication techniques have the potential to improve the efficiency of distributing messages and thus to increase the MANET scalability. In this paper, we propose an efficient cooperative broadcasting scheme based on distributed transmit diversity. To this end, we adapt Space-Time Block- Codes (STBCs), that were initially designed for a co-located setup in quasi-static environments, to a distributed setup with time-variant channels. We perform a comprehensive analysis based on bit error simulations to compare different STBC candidates and identify Linear-Scalable Dispersion Codes (LSDCs) to be a valuable option. For those, we propose an improvement of the inner-code for different channel models without the need for channel state information at the transmitter (CSIT). Besides, we validate the performance advantage of cooperative broadcasting by outage simulations in typical MANET scenarios.

Published
2022

27. Multi-carrier (OFDM) cooperative transmission in MANETs with multiple carrier frequency offsets

Author

Yüksel, Mus'ab, Rolny, Raphael T. L., Kuhn, Marc, Kuhn, Michael, Yüksel, Mus'ab, Rolny, Raphael T. L., Kuhn, Marc, and Kuhn, Michael

Abstract

Cooperative transmission, realized by aggregating several nodes to a virtual multiple input system, is an auspicious approach to establish a more robust and effective communication in MANETs. In such a setup, impairments, i. e. multiple timing and carrier frequency offsets (TO, CFO) will occur. While multi-carrier schemes, e. g. Orthogonal Frequency Division Multiplexing (OFDM), are well-known to mitigate the impact of multipath propagation and TO, multiple CFO causes inter-carrier-interference (ICI) which typically degrades the performance significantly. Within this paper, we propose an effective code and equalizer structure that allows to overcome this limitation. It mitigates the impact of multiple CFO that can be significantly larger than the subcarrier spacing with a reasonable computational effort. For that, we utilize inherent code properties of Linear-Scalable Dispersion Codes (LSDCs) and propose a communication system composed of an equalizer structure in combination with LSDCs that enables multi-carrier distributed cooperative transmission for practical MANETs with high node mobility. We demonstrate the benefits of cooperative transmission in comparison to classical non-cooperative multi-hop or concurrent transmission by outage simulations, which clearly indicate that our proposal can be of crucial importance for the overall MANET scalability. Lastly, we compare our OFDM system with a recently proposed time-domain equalization single-carrier system and point out use cases, where the OFDM system can be more advantageous.

Published
2022

28. Multi-carrier (OFDM) cooperative transmission in MANETs with multiple carrier frequency offsets

Author

Mus'ab Yuksel, Raphael T. L. Rolny, Marc Kuhn, and Michael Kuhn

Subjects
Distributed space-time coding, Frequency offset, Wireless communication, 004: Informatik, MANET, OFDM, Cooperative communication
Abstract

Cooperative transmission, realized by aggregating several nodes to a virtual multiple input system, is an auspicious approach to establish a more robust and effective communication in MANETs. In such a setup, impairments, i. e. multiple timing and carrier frequency offsets (TO, CFO) will occur. While multi-carrier schemes, e. g. Orthogonal Frequency Division Multiplexing (OFDM), are well-known to mitigate the impact of multipath propagation and TO, multiple CFO causes inter-carrier-interference (ICI) which typically degrades the performance significantly. Within this paper, we propose an effective code and equalizer structure that allows to overcome this limitation. It mitigates the impact of multiple CFO that can be significantly larger than the subcarrier spacing with a reasonable computational effort. For that, we utilize inherent code properties of Linear-Scalable Dispersion Codes (LSDCs) and propose a communication system composed of an equalizer structure in combination with LSDCs that enables multi-carrier distributed cooperative transmission for practical MANETs with high node mobility. We demonstrate the benefits of cooperative transmission in comparison to classical non-cooperative multi-hop or concurrent transmission by outage simulations, which clearly indicate that our proposal can be of crucial importance for the overall MANET scalability. Lastly, we compare our OFDM system with a recently proposed time-domain equalization single-carrier system and point out use cases, where the OFDM system can be more advantageous.

Published
2022

35. MEMS-Based Fingerprinting Architecture for Trustworthy Electronics

Author

Meinel, Katja, primary, Schott, Christian, additional, Mayer, Franziska, additional, Gupta, Dhruv, additional, Mittag, Sebastian, additional, Hahn, Susann, additional, Weidlich, Sebastian, additional, Bülz, Daniel, additional, Forke, Roman, additional, Hiller, Karla, additional, Heinkel, Ulrich, additional, and Kuhn, Harald, additional

Published
2023
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results