A
Alexander Koelpin
Researcher at Hamburg University of Technology
Publications - 299
Citations - 3241
Alexander Koelpin is an academic researcher from Hamburg University of Technology. The author has contributed to research in topics: Radar & Antenna (radio). The author has an hindex of 23, co-authored 276 publications receiving 2427 citations. Previous affiliations of Alexander Koelpin include Brandenburg University of Technology & University of Erlangen-Nuremberg.
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Journal ArticleDOI
Robust Resource Allocation for MIMO Wireless Powered Communication Networks Based on a Non-Linear EH Model
TL;DR: This paper proposes a joint time allocation and power control scheme, which takes into account the uncertainty regarding the channel state information (CSI) and provides robustness against imperfect CSI knowledge, and formulate two non-convex optimization problems for different objectives.
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The Six-Port in Modern Society
TL;DR: The six-port concept is based on the additive superposition of the two RF input signals using four different relative phases leading to constructive or destructive interaction, and the resulting signals are directly downconverted to baseband by diode circuits operated in detector or mixing mode.
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Six-Port Radar Sensor for Remote Respiration Rate and Heartbeat Vital-Sign Monitoring
Gabor Vinci,Stefan Lindner,Francesco Barbon,Sebastian Mann,M. Hofmann,Alexander Duda,Robert Weigel,Alexander Koelpin +7 more
TL;DR: In this paper, a monostatic radar based on a six-port interferometer operating a continuous-wave signal at 24 GHz and a radiated power of less than 3 GHz is presented.
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Radar-Based Heart Sound Detection
Christoph Will,Kilin Shi,Sven Schellenberger,Tobias Steigleder,Fabian Michler,Jonas Fuchs,Robert Weigel,Christoph Ostgathe,Alexander Koelpin +8 more
TL;DR: Using the detected heart sounds considerably improves radar-based heartbeat monitoring, while the achieved performance is also competitive to phonocardiography.
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A CDMA Modulation Technique for Automotive Time-of-Flight LiDAR Systems
TL;DR: In this article, an application of optical code division multiple access (OCDMA) modulation based on optical orthogonal codes for automotive time-of-flight light detection and ranging (LiDAR) system sensors using avalanche photodiode (APD) detectors is presented.