Deutsche Telekom

About: Deutsche Telekom is a company organization based out in Welwyn Garden City, United Kingdom. It is known for research contribution in the topics: Telecommunications network & Signal. The organization has 3473 authors who have published 5208 publications receiving 65429 citations. The organization is also known as: DTAG & German Telecom.

10.7-Gb/s Discrete Multitone Transmission Over 25-m Bend-Insensitive Multicore Polymer Optical Fiber

Abstract: We report on 10.7-Gb/s transmission over 25-m multicore polymer optical fiber (MC-POF) which allows a robust transmission and ease of installation including tight bends. The discrete multitone modulation technique is applied to the intensity-modulated direct-detection optical channel in order to achieve high spectral efficiency. The use of bend-insensitive MC-POF reduces significantly the admissible bending radius to 2.5 mm without any signal distortion resulting in a very robust installation. The POF-optimized receiver comprises a silicon pin photodiode with an active diameter of 400 and a transimpedance amplifier.

A collaborative system for protecting against the propagation of malwares in a network

Abstract: The present invention is a system for using a collective computing power of a plurality of network stations in a communication network in order to overcome threats generated by malicious applications. Collaboratively, a large group of simple network stations implement a vaccination mechanism, proliferating information concerning malicious applications (malwares) throughout the network in an efficient manner.

An efficient ontology-based expert peering system

Abstract: This paper proposes a novel expert peering system for information exchange. Our objective is to develop a real-time search engine for an online community where users can query experts, who are simply other participating users knowledgeable in that area, for help on various topics. We consider a graph-based scheme consisting of an ontology tree where each node represents a (sub)topic. Consequently, the fields of expertise or profiles of the participating experts correspond to subtrees of this ontology. Since user queries can also be mapped to similar tree structures, assigning queries to relevant experts becomes a problem of graph matching. A serialization of the ontology tree allows us to use simple dot products on the ontology vector space effectively to address this problem. As a demonstrative example, we conduct extensive experiments with different parameterizations. We observe that our approach is efficient and yields promising results.

Method for dialog control of voice-operated information and call information services incorporating computer-supported telephony

Abstract: A method provides customer with simple and flexible dialog control and faster access to the desired information. In response to a customer call, a control program for dialog control created with the aid of a graphical editor as a flow chart is started, once access authorization is checked. All of the computer-supported telephony (CTI) information input modules and information output modules provided within the framework of the dialog control service in question, which are subject to continuous monitoring, are simultaneously made available in parallel to the customer via a control module for controlling the resources. The customer can actively intervene in the dialog already during the welcome via the information input modules allocated to him. The dialog commences again at the place designated by the customer. The method is suitable for at least information, news and connection services which are based on very significant parallelism and which are configured for mass telephony.

Practical deployment of network coding for real-time applications in 5G networks

Abstract: The 5G communication system will provide flexible and programmable networks by leveraging softwarization technologies such as NFV and SDN. That advanced feature of 5G networks will be demonstrated in the context of real-time video surveillance for public safety. Specifically, we demonstrate for the first time a practical deployment of Random Linear Network Coding (RLNC) with NFV and SDN technologies to improve video quality against packet loss due to congestion at the core network and signal impairment of lossy channels at network edges. The demonstration implements NFV and SDN applications on COTS devices to prove its flexibility and portability.