Zobrazeno 1 - 10
of 546
pro vyhledávání: '"Czylwik A"'
Publikováno v:
EURASIP Journal on Wireless Communications and Networking, Vol 2011, Iss 1, p 67 (2011)
Abstract We investigate the resource allocation problem for the downlink of a multiple-input multiple-output orthogonal frequency division multiple access (MIMO-OFDMA) system. The sum rate maximization itself cannot cope with fairness among users. He
Externí odkaz:
https://doaj.org/article/103c722cdb354f9894a20bd65b11284f
Autor:
Dilyan Damyanov, Tobias Kubiczek, Kevin Kolpatzeck, Andreas Czylwik, Thorsten Schultze, Jan C. Balzer
Publikováno v:
IEEE Access, Vol 11, Pp 9680-9690 (2023)
Terahertz time-domain spectroscopy (THz-TDS) is a promising tool for high-resolution 3D imaging of objects due to the high center frequency and bandwidth compared to microwave systems. In addition, terahertz waves have a higher penetration depth than
Externí odkaz:
https://doaj.org/article/9caad0db464c4792ad51229ec7f20643
Autor:
Jan C. Balzer, Clara J. Saraceno, Martin Koch, Priyansha Kaurav, Ullrich R. Pfeiffer, Withawat Withayachumnankul, Thomas Kurner, Andreas Stohr, Mohammed El-Absi, Ali Al-Haj Abbas, Thomas Kaiser, Andreas Czylwik
Publikováno v:
IEEE Journal of Microwaves, Vol 3, Iss 1, Pp 268-288 (2023)
Terahertz (THz) systems open up the possibility of new applications of electromagnetic waves. Enormous bandwidths up to several terahertz enable the development of powerful spectroscopy systems that can provide insights into the structure and materia
Externí odkaz:
https://doaj.org/article/15de34e22e344279948599f822d0dee4
Autor:
Xuan Liu, Lisa Schmitt, Benedikt Sievert, Jonas Lipka, Chong Geng, Kevin Kolpatzeck, Daniel Erni, Andreas Rennings, Jan C. Balzer, Martin Hoffmann, Andreas Czylwik
Publikováno v:
IEEE Access, Vol 10, Pp 84458-84472 (2022)
With the increase in potential uses of terahertz technology, the need for terahertz transceivers with application-oriented adaptive radiation patterns has emerged. Reconfigurable reflectarrays consisting of actuated sub-wavelength reflectors have bee
Externí odkaz:
https://doaj.org/article/09bd0f0334be4d14acecc6c8e274df7c
Publikováno v:
IEEE Access, Vol 8, Pp 170672-170680 (2020)
The scattering phenomenon caused by rough surfaces has a dominant role in shaping the reflected field at terahertz (THz) frequencies, both in specular and non-specular directions. Most surfaces in nature are randomly rough, and the surface height obe
Externí odkaz:
https://doaj.org/article/176425cb81904307b8a1ca9e9788f5ea
Autor:
Bennis, Mehdi, Simsek, Meryem, Saad, Walid, Valentin, Stefan, Debbah, Merouane, Czylwik, Andreas
The deployment of small cell base stations(SCBSs) overlaid on existing macro-cellular systems is seen as a key solution for offloading traffic, optimizing coverage, and boosting the capacity of future cellular wireless systems. The next-generation of
Externí odkaz:
http://arxiv.org/abs/1303.5698
Autor:
Dilyan Damyanov, Benedikt Friederich, Milad Yahyapour, Nico Vieweg, Anselm Deninger, Kevin Kolpatzeck, Xuan Liu, Andreas Czylwik, Thorsten Schultze, Ingolf Willms, Jan C. Balzer
Publikováno v:
IEEE Access, Vol 7, Pp 147704-147712 (2019)
In this paper, we propose a fast terahertz time-domain imaging method using a radar migration algorithm. We demonstrate high-resolution imaging in reflection without any collimating or focusing optics in the terahertz beam. In the proposed method, th
Externí odkaz:
https://doaj.org/article/c6cd1cd916ad4f47adf3f634a2397bbc
Publikováno v:
Journal of Microelectromechanical Systems. 32:195-207
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::304fc38b85591c0084d8e310e451694c
https://doi.org/10.1109/jmems.2023.3236145
https://doi.org/10.1109/jmems.2023.3236145
Publikováno v:
Mathematics, Vol 9, Iss 20, p 2592 (2021)
One serious disadvantage of any multicarrier-modulation technique such as orthogonal frequency division multiplexing (OFDM) is its high peak-to-average-power ratio (PAPR) which might lead to signal clipping in several scenarios. To maximize the trans
Externí odkaz:
https://doaj.org/article/13afb1251f414d168fbea3c5308827ec
Publikováno v:
Sensors, Vol 21, Iss 16, p 5389 (2021)
Terahertz time-domain spectroscopy systems driven by monolithic mode-locked laser diodes (MLLDs) exhibit bandwidths exceeding 1 THz and a peak dynamic range that can compete with other state-of-the-art systems. Their main difference compared to fiber
Externí odkaz:
https://doaj.org/article/855ba8d97fb84faaa5d7e9a26322c4e0