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

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

Kölle, Christoph Friedrich Karl von, 1781-1848, saksa diplomaat ja kirjanikTänab kirja eest ja palub enda juurest läbi astud

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