-
[show abstract]
[hide abstract]
ABSTRACT: The paper describes some essential trends in the development of satellite communications and introduces promising future applications. Important developments are the set up of standards based on digital video broadcast (DVB) and the application of on-board switching taking into account quality of service (QoS). Other developments are the application of multiprotocol label switching (MPLS) to satellite networks and the usage of optical inter-satellite and inter-platform links. Seamless interworking with terrestrial wireless access networks and with terrestrial core networks is of paramount importance for the success of satellite networks. Future applications of satellite communications include aeronautical satellite communications, satellite-based air traffic management and personalised land mobile radio broadcasting.
Personal, Indoor and Mobile Radio Communications, 2004. PIMRC 2004. 15th IEEE International Symposium on; 10/2004
-
[show abstract]
[hide abstract]
ABSTRACT: Two analytical methods for determining the packet error rate in
the non-interleaved Rayleigh fading channel are presented. The first
method is an exact evaluation of the packet error rate, whereas the
second method is based on a k-state digital channel model. The fading
model is a nonfrequency selective Rayleigh fading with a first-order low
pass spectrum for the quadrature fading components. The analytical
methods are complemented by simulations. The influence of the fading
bandwidth on the packet error rate and the packet throughput is
discussed. Block codes as well as convolutional codes are considered.
The results show that without forward error correction the throughput
for slow fading is higher than for fast fading. With forward error
correction the packet error rate is sensitive to the fading bandwidth.
Furthermore it is shown that the convolutional code with intra packet
interleaving is least sensitive to slow fading
IEEE Transactions on Communications 03/1995; · 1.68 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: Within the next years, a large number of new satellite systems for broadband multimedia communications will be developed for fixed, portable and mobile terminals. In order to satisfy the expanded bandwidth requirements and to avoid the restricted capacity of lower frequency bands, these systems will operate at frequency bands above 18 GHz.
Space Technology. 20(2000-6):1-10.
-
[show abstract]
[hide abstract]
ABSTRACT: Der UMTS-Standard sieht eine Integration von terrestrischen Mobilfunknetzen und Satellitennetzen vor. Ferner eröffnen die Entwicklung neuer Satellitengenerationen und die Fortschritte in der Handy-Technologie neue Möglichkeiten, die Satellitenkommunikation effizienter und kostengünstiger zu realisieren. Könnte somit S-UMTS nach dem Debakel von Iridium eine neue Chance für den arg gebeutelten Satellitenmobilfunk sein ?
telekom praxis. 77(2000-12):20-26.
-
ISBN: ISSN 1438-1648
-
WWRF Kick-Off Meeting, March 6-7, 2001, Munich, Germany;
-
DLR Nachrichten Sonderausgabe 25 Jahre Forschung mit der Falcon, DLR. 100(2001-1):44-47.
-
ATM-Sat Workshop, Oberpfaffenhofen, 12. Dezember 2000, Vortrag;
-
pages 1-433; , ISBN: ISBN 3-540-66840-3
-
3rd PROMETHEUS Workshop, 26-27 April 1990, Turin, Italien.;
-
Funkschau.
-
Institutskolloquium bei NT, OP, 23.11.1994;
-
[show abstract]
[hide abstract]
ABSTRACT: Several possible frequency bands are discussed for application in PROMETHEUS and DRIVE short- and medium-range communications. This paper considers the following frequencies: 900 MHz, 2.5 GHz, 6 GHz, 60 GHz. The aspects transmit power, transmission range, frequency reuse, bandwidth efficiency, influence of precipitation, attenuation due to obstacles, antennas and multipath fading will be discussed. Within the European PROMETHEUS research program the DLR investigates the 60 GHz link and is developping a channel model. A draft multipath propagation model is presented and compared with measurements. The probability density function of the received power shows a Rice/Rayleigh-Lognormal distribution. Simulations with measured channel data results in packet error rates in the order of 10-4 - 10-1 depending on the vehicles distance and the environment.
Vortragender: W. Schaefer;
-
Mobile and Personal Satellite Communications, 174-201, 23 figs.
-
U.R.S.I. Commsphere '97, Lausanne, Februar 1997;
-
-
DLR-Nachrichten.
-
IMSC '97, Pasadena, Ca, 16.-18.6.97;
-
DGLR-Kolloquium, Bonn, 22.05.96;
-
