13 research outputs found
Mitigating Smart Jammers in Multi-User MIMO
Wireless systems must be resilient to jamming attacks. Existing mitigation
methods based on multi-antenna processing require knowledge of the jammer's
transmit characteristics that may be difficult to acquire, especially for smart
jammers that evade mitigation by transmitting only at specific instants. We
propose a novel method to mitigate smart jamming attacks on the massive
multi-user multiple-input multiple-output (MU-MIMO) uplink which does not
require the jammer to be active at any specific instant. By formulating an
optimization problem that unifies jammer estimation and mitigation, channel
estimation, and data detection, we exploit that a jammer cannot change its
subspace within a coherence interval. Theoretical results for our problem
formulation show that its solution is guaranteed to recover the users' data
symbols under certain conditions. We develop two efficient iterative algorithms
for approximately solving the proposed problem formulation: MAED, a
parameter-free algorithm which uses forward-backward splitting with a box
symbol prior, and SO-MAED, which replaces the prior of MAED with soft-output
symbol estimates that exploit the discrete transmit constellation and which
uses deep unfolding to optimize algorithm parameters. We use simulations to
demonstrate that the proposed algorithms effectively mitigate a wide range of
smart jammers without a priori knowledge about the attack type.Comment: arXiv admin note: text overlap with arXiv:2201.0877
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2020 Proceedings of the 3rd International Conference on Trauma Surgery Technology in Giessen
The 3
rd event of the Giessen International Conference on Trauma Surgery Technology on
October, the 17th 2020 was hosted on Zoom in accordance with the worldwide corona
situation. Dr Mieczakowski, Dr Yu, and Wolfram drafted in 2018 from Jan’s apartment in Bremen the
manuscript which was submitted to and approved for funding by the Deutsche
Forschungsgemeinschaft (DFG). At that time, we had no idea what substantial changes the
conferencing concept would require. This is why we would like to thank again Michele. She first
planned this year’s event after the 2019 date and then in the spring of 2020 had to replan for the
new situation
Kiri Wilmannile
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Industrie 4.0 in der Galvanotechnik
Digital transformation offers great potential in the electroplating technology. Especially the use of data to improve the electrolyte control, to enable the introduction of predictive maintenance approaches or to increase the quality is an excitingfield of application. The article provides an overview of opportunities and obstacles concerning the introduction of industry 4.0, explains frequently used terms and introduces the topic of data acquisition, data analysis and simulation. Finally, practical examples from projects of the Fraunhofer IPA, the IFF of the University of Stuttgart and the IWF of the TU Braunschweig will be used to present the first SME-suitable solutions for digital transformation in the electroplating industry
Industrie 4.0 in der Galvanotechnik
Digital transformation offers great potential in the electroplating technology. Especially the use of data to improve the electrolyte control, to enable the introduction of predictive maintenance approaches or to increase the quality is an exciting field of application. The article provides an overview of opportunities and obstacles concerning the introduction of industry 4.0, explains frequently used terms and introduces the topic of data acquisition, data analysis and simulation. Finally, practical examples from projects of the Fraunhofer IPA, the IFF of the University of Stuttgart and the IWF of the TU Braunschweig will be used to present the first SME-suitable solutions for digital transformation in the electroplating industry