Dorferneuerung als raumordnungspolitische Entwicklungsaufgabe: dargestellt am Beispiel von vier nordhessischen Doerfern Eine geographische Untersuchung zur Implementationsproblematik der Regionalpolitik, unter Beruecksichtigung des Zukunftsinvestitionsprogramms der Bundesregierung (ZIP)

Bibliothek Weltwirtschaft Kiel A 160534 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Optical wireless communications for broadband access in home area networks

As a part of the EU-FP7 R&D programme. the OMEGA project (hOME Gigabit Access) anus at bridging the gap between mobile broadband terminals and the wired backbone network in homes. To provide Gb/s connectivity a combination of various technologies is considered. Beside radio frequencies, the wireless links will use infrared and visible light. Combined with power-line communications this enables a home area network (HAN) that meets the vision of broadband home networking, ‘without new wires’. A technology-independent MAC layer is foreseen to control Such network and to provide services as well as connectivity to any device the User wishes to connect. Moreover, this MAC layer should allow the service to follow the User from device to device in any room of a building/apartment. The contribution presents ideas and approaches for broadband optical wireless (OW) communications Using infrared Gb/s hotspots and 100 Mb/s information broadcasting by means of interior lighting based on white-light LEDs. Important issues concerning the physical layer are discussed

Wireless Optical Network for a Home Network

During the European collaborative project OMEGA, two optical-wireless prototypes have been developed. The first prototype operates in the near-infrared spectral region and features Giga Ethernet connectivity, a simple transceiver architecture due to the use of on-off keying, a multi-sector transceiver, and an ultra-fast switch for sector-to-sector hand over. This full-duplex system, composed by one base station and one module, transmits data on three meters. The second prototype is a visible-light-communications system based on DMT signal processing and an adapted MAC sublayer. Data rates around to 100 Mb/s at the physical layer are achieved. This broadcast system, composed also by one base station and one module, transmits data up to two meters. In this paper we present the adapted optical wireless media-access-control sublayer protocol for visible-light communications. This protocol accommodates link adaptation from 128 Mb/s to 1024 Mb/s with multi-sector coverage, and half-duplex or full-duplex transmission

Visible-light communication system enabling 73 Mb/s data streaming

The hOME Gigabit Access (OMEGA) home-area-network project aims at bridging the gap between home and access network and providing Gb/s connectivity to users. The project considers a combination of various technologies such as radio-frequency and wireless optical links operating at infrared and visible wavelengths. When combined with power-line communications (PLC), this enables a home backbone that meets the project’s “without new wires” vision. A technology-independent MAC layer will control this network and provide services as well as connectivity to any number of devices the user wishes to connect to in any room of a house/apartment. In order to make this vision come true, substantial progress had to be achieved in the fields of optical wireless physical layer development and data-link-layer protocol design. This paper reports an experimental demonstration of an indoor visible-light wireless link including a MAC layer protocol adapted to optical wireless communications systems. The system operates at 84 Mb/s broadcast and was successfully used to transmit three high-definition video streams