Peter Mandl

Free Space Optics in different (civil and military) application scenarios in combination with other wireless technologies

In this paper Free Space Optics (FSO) in combination with other wireless technologies (including WLAN and satellite communications in civil-military-cooperation (CIMIC)) is presented. At first modular communication systems are shown, which allows worldwide access to the Internet or other networks by combining satellite communications, FSO, Wireless LAN, Local Multipoint Distribution System (LMDS) and DVB-T (terrestrial digital video broadcast). Wireless LAN offers connectivity to mobile users in a network cell, Free Space Optics allows quick installation of broadband fixed wireless links instead of cables and satellite communications provides a backbone between distant locations in the world. DVB-T is the current video broadcast standard (instead of former analogue TV) and will also be used for Internet-access (see project SEE TV-WEB). Different scenarios (and results) using modular wireless technologies are shown. Free Space Optics and wireless applications (including satellite) installed at a civil-military exercise in Styria (southern part of Austria) and other application scenarios are presented. In this civil-military cooperation a mobile satellite earth station (equipped with FSO and Wireless LAN) was used for videoconferencing between military and civil organizations. Applications with DVB-T will supplement a few scenarios in combining wireless technologies with FSO.

Wireless synchronous broadband last mile access solutions for multimedia applications in license free frequency spectrums

A dominant percentage of last mile Internet connections within entire Europe are realized with copper cable pairs (POTL) which are limited in bandwidth by cable length (attenuation) and the number of XDSL lines in a telecommunication cable (crosstalk). Exposed users often cannot get state of the art broadband Internet connections for these reasons and in addition also have to share existing bandwidth with other users which can lead to low bitrates. Current trends show a strong demand of synchronous broadband Internet lines for high quality multimedia applications (e.g. VoD, online video communities and video conferencing). This paper will focus on alternative wireless synchronous license exempt optical and radio frequency wireless last mile access technologies and shows advantages and disadvantages between different methods.

Selected health and law issues regarding mobile communications

Over the next years the demand of wireless communication will increase tremendously. More and more mobile end devices require a high data rate connection e.g. to a smart home (Internet of Things, IoT) or to the internet. The radiation power pattern of base stations and mobile end devices will completely change for the 5G technology. Therefore the electromagnetic exposure especially to human body will increase in the future, because most of the wireless connections are realized in RF technology. In this contribution two different measurement setups are presented. The first shows the electromagnetic radiation regarding a base station powered by a mobile phone provider over a timespan of a number of days. The second figures out the electromagnetic radiation of a handheld mobile end device to a human head in an area with very poor reception values. The results of those measurements where compared with legal and health limits. All measured and calculated results regarding the base stations were within the legal exposure limits. The calculated legal exposure limits of mobile devices were exceeded twice in areas within very poor reception values. Regarding the expected higher bandwidth and corresponding higher electromagnetic exposure to human bodies in future there have to be periodic measurements to comply with radiation limits.

Law situation of license exempt free space optic beams influencing private properties

FSO (Free Space Optic) communication systems offer significant technical and operational advantages such as higher bandwidth, robustness to electromagnetic interference, high degree of spatial confinement and low power consumption. These systems use optical frequencies from 300 GHz to 30 PHz including infrared, visible and ultraviolet bands. In comparison to RF based systems, FSO units can operate license free because of a lack of spectrum regulation above 3 THz. For typical FSO applications, the optical beams are directed over a number of estates. This paper will show the investigation of FSO system related regulatory framework and eye safety issues. The main focus will be on the situation of FSO beams crossing (private) properties with regards to the Austrian law.

FSO and WLAN as backward channel for internet connections of peripheral regions only covered by DVB-T

Nowadays FSO (Free Space Optics) is a well-established technology for closing the last mile gap. This contribution will show the usage of FSO in combination with other Wireless Technologies (in the special case with WLAN and DVB-T) for regions of low Internet coverage. FSO allows a broadband access with high data rate for users not connected so far by fibre cables. It is a well-known fact that peripheral regions lack of reasonable broadband Internet services. Landlines often are outdated or have very high attenuation. WLAN and FSO (Free Space Optics) are license free transmission technologies and DVB-T has become a geographically widespread technology. This paper will show an alternative Internet access method using WLAN and FSO systems as a data uplink and DVB-T as a downlink channel for broadband data access. The work is carried out within international co-operations in the frame of a Special Programme of European Union SEE (South-East-Europe). The main objective of this strategic project is to tackle the Digital Divide by developing a joint, coordinated and viable initiative which will increase the accessibility and availability of AVMS on-demand and Information Society services offering at least minimal Internet experience to the vulnerable groups such as elderly, persons with disabilities, economically weak and all those who have a limited access to Internet services due to lack of access (rural) or limited computer/Internet literacy.

Verwendung von DVB-T, WLAN und FSO für Internetanbindungen in unterversorgten Regionen

SummaryIt is a well-known fact that peripheral regions often lack of reasonable broadband Internet services. Landlines are often outdated or have very high attenuation. WLAN and FSO (Free Space Optics) are license free transmission technologies and DVB-T has become a geographically widespread technology. This paper will show an alternative Internet access method using WLAN and FSO systems as a data uplink and DVB-T as a downlink channel for broadband data access.ZusammenfassungEs ist eine bekannte Tatsache, dass ländliche Regionen oftmals nur mit schmalbandigen Internetdiensten angebunden sind. Die zur Verfügung stehenden Kabelverbindungen sind oft überaltert oder haben hohe Dämpfungswerte. WLAN und FSO (Free Space Optics) sind lizenzfreie Übertragungstechnologien, und DVB-T ist eine sehr weitverbreitete Technologie geworden. Diese Publikation zeigt eine alternative Internet-Zugangstmethode, bei der WLAN- und FSO-Systeme als Datenrückkanal und DVB-T als Vorwärtskanal für breitbandige Internetverbindungen verwendet werden.

Verwendung von Lichtfunk, Glasfaser und WLAN als temporäre Installation für Multimediaanwendungen

ZusammenfassungImmobilieninvestoren verlangen heute immer leistungsstärkere technische Infrastrukturen in Gebäuden, um am Markt konkurrenzfähig zu bleiben und den Benutzern höchsten Komfort bieten zu können. Um die leistungsfähige Konvergenz von Telefonie (SIP VoIP), Internet über WLAN und digitalem TV zu zeigen, wird in dieser Publikation das Zusammenspiel verschiedener Last Mile Access-Technologien (WLAN, FSO, Glasfaser) in Verbindung mit hoch (HDTV) und niedrig auflösenden (SDTV) Multimediasignalen im Zuge eines Testaufbaus dargestellt und im Feldversuch geschildert. Es werden die Vor- und Nachteile der einzelnen Technologien in der Praxis dargelegt und erörtert.SummaryNowadays real estate investors request more and more high-performance buildings to be competitive on the market and to deliver the highest convenience to its users. To present the convergence of telephony (SIP VoIP), Internet services over WLAN and digital TV this paper shows the interaction of state-of-the-art last mile access technologies (WLAN, FSO, fiber optics) in combination with high (HDTV) and low (SDTV) resolution multimedia signals during a test setup. Advantages and disadvantages of the used technologies in this special case will be shown and discussed.