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Erscheinungsjahr
- 2009 (179) (entfernen)
Institut
- Fachbereich Medizintechnik und Technomathematik (66)
- IfB - Institut für Bioengineering (29)
- Fachbereich Elektrotechnik und Informationstechnik (27)
- INB - Institut für Nano- und Biotechnologien (26)
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- Fachbereich Chemie und Biotechnologie (16)
- Fachbereich Energietechnik (12)
- Solar-Institut Jülich (12)
- Fachbereich Maschinenbau und Mechatronik (8)
- Fachbereich Bauingenieurwesen (6)
Volltext vorhanden
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- Englisch (179) (entfernen)
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In this paper, the multicarrier physical layers of WiMAX are evaluated in the context of airport data links. The orthogonal frequency-division multiplexing (OFDM) and orthogonal frequency-division multiple-access (OFDMA) cases are applied to the forward link (FL) and reverse link (RL), respectively. The performance of the so called parking and taxi scenarios is presented for airport communications in C-band. Numerical results show that the proposed scheme brings good performance for both the FL and the RL. For the OFDMA case a structure changing called double-tile is also proposed to improve the system performance.
Ahlbrink, N. ; Alexopoulos, Spiros ; Andersson, J. ; Belhomme, B. ; Teixeira Boura, Cristiano José ; Gall, J. ; Hirsch, T.
The utilisation of vehicle-oriented gasoline in general aviation is very desirable for both ecological and economical reasons, as well as for general considerations of availability. As of today vehicle fuels may be used if the respective engine and cell are certified for such an operation. For older planes a supplementary technical certificate is provided for gasoline mixtures with less than 1 % v/v ethanol only, though. Larger admixtures of ethanol may lead to sudden engine malfunction and should be considered as considerable security risks. Major problems are caused by the partially ethanol non-withstanding materials, a necessarily changed stochiometric adjustment of the engine for varying ethanol shares and the tendency for phase separation in the presence of absorbed water. The concepts of the flexible fuel vehicles are only partially applicable in the view of air security.