Browsing by Keyword "Communication systems"
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Item DVB-S2 and DVB-T RF transmission in 1-mm GI-POF system(2014-08-15) Beltrán, Marta; Cabezón, Xabier; Campo, Miguel A.; Trueba, Roberto; Lekue, Antonio; Pac, Jose M.; Cortés, Francisco J.; Llorente, Roberto; FACTORY; Tecnalia Research & InnovationAn optical system for the transmission of digital video broadcasting (DVB) signals is proposed and experimentally demonstrated. The transmission media comprises 1-mm diameter graded-index plastic optical fiber (GI-POF) with a relatively high bandwidth. The system is fully engineered using low-cost off-the-self components including a vertical-cavity surface-emitting laser, a silicon avalanche photodiode, POF connectors, and all integrated radio frequency (RF) circuitry. The RF distribution of standard DVB-satellite second generation signals in 950-2150 MHz and DVB-terrestrial signals in 470-790 MHz over 25-m GI-POF is successfully demonstrated.Item A road to media-aware user-dependent self-adaptive Networks(2009) Areizaga, Enrique; Pérez, Luis; Verikoukis, Christos; Zorba, Nizar; Jacob, Eduardo; Ödling, Per; HPAThe Telecommunications world has been using the wholesale model for a long time, covering both the Connectivity and Service provisioning. This business model is 100% proof for analog telephony and even for Internet Access, but it's starting to show its weakness when Broadcast services offers are brought to the market. Creativity and innovation are key factors for the success of new business roles, more precisely disruptive creativity (one of the pillars of Schumpeter's philosophy: research on topics that big companies will not invest as they are not part of their day-to-day products, services or process). However, the obsession for absolute control by Telecommunications operators is stopping the disruptive creativity in new multimedia services provisioning (either by Service Providers or by users acting as producers). But, there are a lot of signs that show that it is about time to move from the "Buy bandwidth" to the "Buy personalized services". This paper addresses the new bunch of advanced technologies provided by media-aware, user-dependent, self-adaptive Networks (a.k.a. R2D2Networks) in order to exploit the costeffectiveness of European Infrastructures already deployed, whilst applying research into the User-centric based multimedia services environment, with specific attention to the efficient management of connectivity resources among the home, inbuilding and access networks. R2D2Networks will provide a network management system that doesn't rely on any specific content provider models, or require major changes in the network architectures. This means that time to market can be short, and that also smaller operators can benefit from this solution.