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9 results on '"Petrovic, Denis"'

4. Effects of phase noise on OFDM systems with and without PLL: characterization and compensation

Author

Petrovic, Denis, Rave, Wolfgang, and Fettweis, Gerhard

Subjects
Algorithm, Algorithms -- Methods, Phase-locked loops -- Usage, Electromagnetic noise -- Measurement, Oscillators (Electronics) -- Usage
Abstract

In this paper, we propose an algorithm for suppressing intercarrier interference due to phase noise in coded orthogonal frequency division multiplexing (OFDM) systems. The algorithm approximates the phase-noise waveform by using a Fourier series approximation for the current phase-noise realization. Thereby, it cancels the effects of the phase noise beyond the standard common phase error correction used in contemporary OFDM standards. The algorithm requires that the correlation properties of the intercarrier interference are known. We calculate these properties in terms of the phase-noise spectral correlation matrix for both Wiener and Ornstein-Uhlenbeck phase-noise models, respectively. This modeling corresponds to a free-running oscillator, as well as a phase-locked loop realization of the local oscillator in orthogonal frequency division multiplexing transceivers. For both transceiver configurations, we investigate the performance of the proposed algorithm. It is demonstrated that the new algorithm achieves as much as one order of magnitude better performance in terms of packet/bit error rate when compared to a receiver with only the common phase error suppression. Index Terms--Orthogonal frequency division multiplexing (OFDM), phase-locked loop, phase noise.

Published
2007

5. Mechanistic Studies of the Deslongchamps Annulation

Author

Petrovic Denis, Michael Kreibich, and Reinhard Brückner

Subjects
Annulation, Primary (chemistry), 010405 organic chemistry, Stereochemistry, Organic Chemistry, Substituent, 010402 general chemistry, 01 natural sciences, Benzoquinone, 0104 chemical sciences, Adduct, chemistry.chemical_compound, chemistry, Reagent, Proton NMR
Abstract

The Cs2CO3-mediated annulations (“Deslongchamps annulations”) of three spirocyclic benzoquinone monoketals 5b–d with an ester or acyl substituent at C-2 to two tert-butyl esters of γ,δ-unsaturated β-ketocarboxyl acids (“Nazarov reagents”; 2a,b) were monitored 1H NMR spectroscopically. This revealed that a primary product, by all likelihood the Michael adduct, forms fast and prior to the appearance of the Deslongchamps adduct. These primary products form reversibly. This was proved by two crossover and four scavenging experiments. Therein, components already incorporated in one of the mentioned primary products ended up in Deslongchamps adducts different from the one, which would have resulted if the respective primary product had reacted alone. However, these experiments leave open whether our primary products are intermediates en route to Deslongchamps products or whether they represent dead ends.

Published
2017

6. Deslongchamps Annulations with Benzoquinone Monoketals

Author

Petrovic Denis and Reinhard Brückner

Subjects
Annulation, Molecular Structure, Cyclohexanones, Chemistry, Organic Chemistry, Stereoisomerism, Ketones, Spironolactone, Biochemistry, Benzoquinone, Catalysis, Deprotonation, Benzoquinones, Organic chemistry, Spiro Compounds, Physical and Theoretical Chemistry
Abstract

The so-called Deslongchamps annulation of deprotonated γ,δ-unsaturated β-ketoesters 15 to 2-(alkoxycarbonyl)cyclohex-2-en-1-ones or similarly activated cyclohex-2-en-1-ones offers a versatile access to various kinds of decalindiones. The scope of Deslongchamps annulations was extended by establishing acceptor-substituted benzoquinone monoketals such as 13 as viable substrates. They gave octalindiones such as 35 with diastereoselectivities ≥ 95:5.

Published
2011

8. Dirty RF: A New Paradigm

Author

Fettweis, Gerhard, primary, Löhning, Michael, additional, Petrovic, Denis, additional, Windisch, Marcus, additional, Zillmann, Peter, additional, and Rave, Wolfgang, additional

Published
2006
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9. Short‐range Wireless Communications

Author

Fettweis, Gerhard, primary, Zimmermann, Ernesto, additional, Allen, Ben, additional, O'Brien, Dominic C., additional, Chevillat, Pierre, additional, Jungnickel, Volker, additional, Jorswiek, Eduard, additional, Zillmann, Peter, additional, Petrovic, Denis, additional, Schwieger, Katja, additional, Windisch, Marcus, additional, Seller, Olivier, additional, Siohan, Pierre, additional, Lallemand, Frédéric, additional, Salingue, Guy, additional, Pierrot, Jean‐Benoît, additional, Debbah, Merouane, additional, Gesbert, David, additional, Knopp, Raymond, additional, van der Perre, Liesbet, additional, Brown, Tony, additional, Zhang, David, additional, Malik, Wasim, additional, Edwards, David, additional, Stevens, Christopher, additional, Ouvry, Laurent, additional, Morche, Dominique, additional, Oppermann, Ian, additional, Celentano, Ulrico, additional, Katz, Marcos, additional, Wang, Peter, additional, Kalliojarvi, Kari, additional, Arnon, Shlomi, additional, Matsumoto, Mitsuji, additional, Green, Roger, additional, Jivkova, Svetla, additional, Coronel, P., additional, Schott, W., additional, Zasowski, T., additional, Ghavami, Mohammad, additional, He, Ru, additional, Sorgel, Werner, additional, Kuhnert, Christiane, additional, Wiesbeck, Werner, additional, Hernandez, Marco, additional, Siwiak, Kazimierz, additional, Manny, Ben, additional, Mucchi, Lorenzo, additional, Morosi, Simone, additional, and Ran, M., additional

Published
2006
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