Efficient channel quantization scheme for multi-user MIMO broadcast channels with RBD precoding. - In: IEEE International Conference on Acoustics, Speech and Signal Processing, 2008, ISBN 978-1-4244-1483-3, (2008), S. 2389-2392
http://dx.doi.org/10.1109/ICASSP.2008.4518128
Channel representative interference cancellation (CRIC) for MIMO multi-hop systems in the Manhattan scenario. - In: IEEE International Conference on Acoustics, Speech and Signal Processing, 2008, ISBN 978-1-4244-1483-3, (2008), S. 1613-1616
http://dx.doi.org/10.1109/ICASSP.2008.4517934
Tensor-based framework for the prediction of frequency-selective time-variant MIMO channels. - In: International ITG Workshop on Smart Antennas, 2008, ISBN 978-1-4244-1757-5, (2008), S. 147-152
http://dx.doi.org/10.1109/WSA.2008.4475550
Quality of service oriented spatial processing in the Manhattan grid. - In: International ITG Workshop on Smart Antennas, 2008, ISBN 978-1-4244-1757-5, (2008), S. 362-369
http://dx.doi.org/10.1109/WSA.2008.4475583
Receive antenna impact on spatio-temporal availability in satellite-to-indoor broadcasting. - In: International ITG Workshop on Smart Antennas, 2008, ISBN 978-1-4244-1757-5, (2008), S. 48-54
http://dx.doi.org/10.1109/WSA.2008.4475536
Performance comparison of TOA and TDOA based location estimation algorithms in LOS environment. - In: 5th Workshop on Positioning, Navigation, and Communication, 2008, (2008), S. 71-78
http://dx.doi.org/10.1109/WPNC.2008.4510359
Ontologie-basierte kontextsensitive Dienste für die Bedürfnisse pflegebedürftiger Menschen. - In: Seniorengerechte Schnittstellen zur Technik, (2008), S. 23-30
Literaturangaben
Die fortschreitende Entwicklung moderner Kommunikationsnetze ermöglichte in den vergangenen Jahren das Entstehen intelli-genter Systeme, die in der Lage sind Dienste anzubieten, die sich an den Nutzer und dessen Präferenzen anpassen. Diese Dienste nennt man kontextsensitive Dienste. - Unter Zuhilfenahme von Kontextinformationen, die über menschliche Interaktionen mit der Umwelt gewonnen werden (wie beispielsweise der Standort eines Benutzers, die Tageszeit, Menschen und Geräte in der Nähe eines Benutzers, dessen aktuelle Aktivität), werden geeignete Dienste ausgewählt und angeboten. - In diesem Beitrag wird die grundlegende Architektur für ein System vorgestellt, welches solche kontextsensitiven Dienste für die Bedürfnisse pflegebedürftiger Menschen, die allein zu Hause leben und Betreuung brauchen, anbieten kann.
Handover-aware SIP-based VoIP provided by a roaming-enabled architecture (REACH). - In: IEEE Sarnoff Symposium, 2008, ISBN 978-1-4244-1843-5, (2008), insges. 6 S.
The protocols of Voice-over-IP (SIP, RTP and RTCP) have several issues, for example the NAT and the firewall problem. They lead to solutions such as "Back-to-back User Agents" (B2BUA), "Session Border Controllers" and helper-protocols such as "Simple Traversal of UDP through NATs" (STUN) and "Traversal Using Relay NAT" (TURN). - This paper focusses on a different challenge, a problem that arises when a user becomes mobile and his IP-enabled telephone is forced to change its network access technology due to network coverage issues ("perform a vertical handover"). We present a middleware-based solution that makes SIP-based VoIP handover-aware and effectively solves the NAT and firewall problem. - This approach builds on the "Roaming-Enabled Architecture" (REACH), a plugin-driven middleware that uses proxy servers. REACH offers for multiple data capturing schemes required to provide an easy-to-use handover-aware solution, but VoIP was not supported yet. Here, we present a self-implemented "Session Border Controller" for SIP and RTP that was divided into two designed to be used within the infrastructure of REACH. - This mechanism adds full support for VoIP to the REACH software suite, allowing telephony in combination with any kind of vertical handover such as hard-, soft and softer handovers in IP-based networks of any kind.
http://dx.doi.org/10.1109/SARNOF.2008.4520062
REACH: a roaming-enabled architecture for multi-layer capturing. - In: IEEE Wireless Communications and Networking Conference, 2008, (2008), S. 2699-2704
Modern mobile PCs have different kinds of network access technologies, such as wire-based interfaces (Ethernet) or wireless adapters (IEEE 802.11 WLAN, GPRS/GSM or UMTS). Ongoing research deals with the problem of performing a "vertical handover", that allows switching your currently used network access technology on-the-fly without interruption of the application sessions. - The "Roaming-Enabled Architecture" (REACH) presented in this paper is a middleware-based approach that does not use IP mobility extensions and does not depend on modifications of the infrastructure. In fact, it is related to the already published mechanisms {MSOCKS} and the {Universal Seamless Handoff Architecture} (USHA). - However, REACH is designed plugin-driven in order to support multiple coexistent schemes to perform vertical handovers on different layers of the Internet protocol suite. Each {relay plugin} is able to intercept data coming from the applications, which is necessary to route all data through the protection schemes in order to make the mobile nodes handover-aware. - Hard and soft handovers are supported by REACH as well as softer handovers and channel bundling. A mobile node can connect to multiple proxy servers simultaneously in order to utilize different services, take care of some forms of performance degradation that are related to triangle routing and to do load balancing.
http://dx.doi.org/10.1109/WCNC.2007.473
AlGaN/GaN-based MEMS with two-dimensional electron gas for novel sensor applications. - In: Physica status solidi, ISSN 1610-1642, Bd. 5 (2008), 6, S. 1914-1916
http://dx.doi.org/10.1002/pssc.200778424