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In this paper, a multi-channel cognitive radio network is considered in which both primary users (PUs) and secondary users (SUs) can sense and make use of idle channels, i.e. both kinds of users are cognitive. We study a situation where a PU, while transmitting, can sense idle channels with a better transmission rate than the one currently occupied and can switch to such a better channel. This switching...
This paper describes a multi-core processor that integrates 48 cores, 4 DDR3 memory channels, and a voltage regulator controller in a 64 2D-mesh network-on-chip architecture. Located at each mesh node is a five-port virtual cut-through packet-switched router shared between two IA-32 cores. Core-to-core communication uses message passing while exploiting 384 KB of on-die shared memory. Fine grain power...
IPTV has been hailed as a “killer app” of the Internet for a long time, but it has yet to really make a major breakthrough, due to various technical and political reasons. The recent influx of community-driven video distribution has re-actualized the research into efficient distribution methods for streaming video. In this paper, we suggest a number of modifications and extensions to the BitTorrent...
The trench-assistance concept has proven its efficiency for bend-insensitive single-mode fibers. Here, we show how it applies to multi-mode fibers for which bend losses can also be significantly decreased while ensuring full compliance with OM3 and OM4 standards.
A stable and secure operation of the electricity grid is mainly achieved by contracting power generators to ancillary services in addition to their main commercial product, active power. Electricity from Renewable Energy Sources (RES-e) is today generally exempted from the participation in ancillary services. However, the increasing share integration of variable RES-e with a limited predictability...
DSL aggregation networks are evolving to the standard platform for the delivery of multimedia services such as television and network based personal video recording. These multimedia services introduce large challenges for network operators as they are sensitive to packet loss. Therefore, admission control mechanisms are required to avoid congestion caused by allowing too many sessions. However, as...
The introduction of new added value services such as IPTV has introduced great challenges for today's broadband DSL access networks as these services have stringent quality demands. In an attempt to protect the quality delivery of existing sessions, operators employ admission control mechanisms that limit the amount of sessions transmitted in the network. Current admission control mechanisms require...
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