18,580 research outputs found
Exploring Energy-Efficient Reconfigurable Architectures for DSP Algorithms
Future hand-held multimedia terminals require a very high performance on a very small energy budged. Such devices can only be realized if their entire system is energy cognisant. In this paper a reconfigurable systems-architecture for mobile multimedia systems is introduced. The Field Programmable Function Array (FPFA) is discussed in detail. Several digital signal processing algorithms are discussed and mapped on the FPFA. Also,the power radius theory about low-power design is introduced
A Reconfigurable Platform For Cognitive Radio
TodayÂżs rigid spectrum allocation scheme creates a spectrum scarcity problem for future wireless communications. Measurements show that a wide range of the allocated frequency bands are rarely used. Cognitive radio is a novel approach to improve the spectrum usage, which is able to sense the spectrum and adapt its transmission while coexisting with the licensed spectrum user. A reconfigurable radio platform is required to provide enough adaptivity for cognitive radio. In this paper, we propose a cognitive radio system architecture and discuss its possible implementation on a heterogeneous reconfigurable radio platform
Thermalisation of inhomogeneous quantum scalar fields in 1+1D
Using an improved version of the Hartree approximation, allowing for
ensembles of inhomogeneous configurations, we show in a
theory, that initially the system thermalises with a Bose-Einstein
distribution. For later times and larger couplings we see deviations.Comment: Presented at CAPP 2000, 4 pages including figures, typo's correcte
Deformation rings which are not local complete intersections
We study the inverse problem for the versal deformation rings
of finite dimensional representations of a finite group over a
field of positive characteristic . This problem is to determine which
complete local commutative Noetherian rings with residue field can arise up
to isomorphism as such . We show that for all integers
and all complete local commutative Noetherian rings with residue
field , the ring arises in this way. This
ring is not a local complete intersection if , so we
obtain an answer to a question of M. Flach in all characteristics.Comment: 16 page
The Chameleon project in retrospective
In this paper we describe in retrospective the main results of a four year project, called Chameleon. As part of this project we developed a coarse-grained reconfigurable core for DSP algorithms in wireless devices denoted MONTIUM. After presenting the main achievements within this project we present the lessons learned from this project
Modelling of a reverse flow catalytic membrane reactor for the partial oxidation of methane
Gas-To-Liquid (GTL) processes have great potential as alternative to conventional oil and coal processing for the production of liquid fuels. In GTL-processes the partial oxidation of methane (POM) is combined with the Fischer-Tropsch reaction. An important part of the investment costs of a conventional GTL-plant is related to cryogenic air separation. These costs could be substantially reduced by separating air with recently developed oxygen perm-selective perovskite membranes, which operate at similar temperatures as a POM reactor. Integration of these membranes in the POM reactor seems very attractive because oxygen reacts at the membrane surface resulting in a high driving force over the membrane increasing the oxygen permeation
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