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 & Terminal (electronics). The organization has 3473 authors who have published 5208 publications receiving 65429 citations. The organization is also known as: DTAG & German Telecom.

Sourcing Innovation from You Customer: How Multinational Enterprises Use Web Platforms for Virtual Customer Integration

Abstract: Integrating the customer in the innovation process is believed to be a powerful means to reduce failure rates and to increase the revenue from new products Although many companies have launched programs to enable such integration, the understanding of the mechanisms behind successful programs remains limited Furthermore, the benefit of integrating customers in the innovation process has to be weighed against the costs Virtual customer integration has been discussed as a way to limit these costs and bring the benefits of potentially unlimited scalability Using a sample of the Euro Stoxx 50 companies, we shed light on the various types of virtual customer integration platforms, their limitations, their benefits and the mechanisms that have to be put in place to make them succeed Results indicate that only a limited number of platforms go beyond the sourcing of ideas Especially the integration of the customer in the execution phase of the innovation process remains largely limited to digital goods

A Terahertz Wireless Communication Link Using a Superheterodyne Approach

Abstract: This article presents a wireless communication point-to-point link operated in the low terahertz (THz) range, at a center frequency of 300 GHz. The link is composed of all-electronic components based on monolithic millimeter wave integrated circuits fabricated in an InGaAs metamorphic high electron mobility transistor technology. Different configurations and architectures are compared and analyzed. The superheterodyne approach proves to be the most promising of all, being compliant with the new IEEE standard for 100 Gb/s wireless transmissions and showing compatibility to accessible, already available modems. The first option of realizing the superheterodyne configuration is by combining the 300-GHz transmitter and receiver with of-the-shelf up and down converters operating at a center frequency of 10 GHz. In this case, data rates of up to 24 Gb/s are achieved. The second option employs a fast arbitrary waveform generator that uses a carrier frequency to up-convert the baseband data. In this case, data rates of up to 60 Gb/s and transmission distances of up to 10 m are achieved with complex modulated signals like 16-QAM and 32-QAM. The baseband signal is composed of pseudo-random binary sequences and is analyzed offline using fast analog to digital converters. In superheterodyne configuration, multichannel transmission is demonstrated. Channel data rates of 10.2 Gb/s using 64-QAM are achieved. The successful transmission of aggregated channels in this configuration shows the potential of THz communication for future high data rate applications.

Caterpillar RLNC (CRLNC): A Practical Finite Sliding Window RLNC Approach

Abstract: Random linear network coding (RLNC) is a popular coding scheme for improving communication and content distribution over lossy channels. For packet streaming applications, such as video streaming and general IP packet streams, recent research has shown that sliding window RLNC approaches can reduce the in-order delay compared with block-based RLNC. However, existing sliding window RLNC approaches have prohibitive computational complexity or require feedback from the receivers to the sender. We introduce caterpillar RLNC (CRLNC), a practical finite sliding window RLNC approach that does not require feedback. CRLNC requires only simple modifications of the encoded packet structure and elementary pre-processing steps of the received coded packets before feeding the received coding coefficients and symbols into a standard block-based RLNC decoder. We demonstrate through extensive simulations that CRLNC achieves the reliability and low computational complexity of block-based RLNC, while achieving the low in-order delays of sliding window RLNC.

Improving user and ISP experience through ISP-aided P2P locality

Abstract: Despite recent improvements, P2P systems are still plagued by fundamental issues such as overlay/underlay topological and routing mismatch, which affects their performance and causes traffic strains on the ISPs. In this work, we aim to improve overall system performance for ISPs as well as P2P systems by means of traffic localization through improved collaboration between ISPs and P2P systems. More specifically, we study the effects of different ISP/P2P topologies as well as a broad range of influential user behavior characteristics, namely content availability, churn, and query patterns, on end-user and ISP experience. We show that ISP-aided P2P locality benefits both P2P users and ISPs, measured in terms of improved content download times, increased network locality of query responses and desired content, and overall reduction in P2P traffic.