We present a new technique to investigate EMC/EMI interactions in high speed transmission lines on the chip level. The time-domain method is based on the different nature of the problem in conductors and semiconductor...
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We present a new technique to investigate EMC/EMI interactions in high speed transmission lines on the chip level. The time-domain method is based on the different nature of the problem in conductors and semiconductors, compared to the insulating media that separate them. Therefore, the static problem in the silicon oxide is separated from the diffusion problem in conductors. The latter one is solved by an efficient DuFort-Frankel technique, while the static problem is solved by a coarse FEM mesh. In each step, the two problems are appropriately coupled by means of proper interface conditions
In a previous paper, it was proposed a method applied to image simplification in terms of graylevel and flat zone reduction, by histogram classification via morphological processing. It this method, it is possible to ...
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ISBN:
(纸本)9728865406
In a previous paper, it was proposed a method applied to image simplification in terms of graylevel and flat zone reduction, by histogram classification via morphological processing. It this method, it is possible to reduce the number of graylevels of an image to n graylevels by selecting n regional maxima in the processed histogram and discarding the remaining ones, in other to classify the histogram via application of watershed operator. In the previous paper, it was proposed the choice of the n highest regional maxima. By far, it is not the best criterion to choose the regional maxima and other criteria had been were tested in order to obtain a better histogram classification. In this paper we propose the selection of the regional maxima via application of dynamics, a measurement of contrast usually applied to find markers to morphological segmentation.
An interleaver is a critical component for the channel coding performance of turbo codes. Algebraic constructions are of particular interest because they admit analytical designs and simple, practical hardware impleme...
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ISBN:
(纸本)142440505X
An interleaver is a critical component for the channel coding performance of turbo codes. Algebraic constructions are of particular interest because they admit analytical designs and simple, practical hardware implementation. Also, the recently proposed quadratic permutation polynomial (QPP) based interleavers by Sun and Takeshita (IEEE Trans. Inform. Theory, Jan. 2005) provide excellent performance for short-to-medium block lengths. In this work the minimum distance of turbo codes with QPP-based interleavers is considered in detail. Large tables of optimum (in terms of turbo code minimum distance and multiplicity) QPPs for turbo codes with 8-state and 16-state constituent codes are presented. The minimum distances are compared to existing results in the literature on dithered relative prime (DRP) interleavers. The optimality of the new tables makes them an excellent source of information to advance the understanding of permutation polynomial (PP) based interleavers
Security has become a crucial issue in both communication systems and networks. PELICAN is a latest developed MAC function based on RIJNDAEL encryption algorithm. In this work two alternative architectures, for the ef...
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Security has become a crucial issue in both communication systems and networks. PELICAN is a latest developed MAC function based on RIJNDAEL encryption algorithm. In this work two alternative architectures, for the efficient VLSI implementation of PELICAN, are proposed. Both architectures design aim to high optimization, regarding requested covered area. Comparisons concerning performance and allocated resources are given, with the conventional design
In this paper, we study the performance of multihop free-space optical (FSO) wireless systems over turbulence-induced fading channels. The analysis is carried out for systems employing amplify-and-forward (AF) or deco...
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In this paper, we study the performance of multihop free-space optical (FSO) wireless systems over turbulence-induced fading channels. The analysis is carried out for systems employing amplify-and-forward (AF) or decode-and-forward (DF) relays and for turbulence channels which can be modeled by the Gamma-Gamma distribution. An exact analytical expression for the end-to-end outage probability of AF systems is obtained, while a closed-form expression of DF systems is derived. The average bit-error probability of a dual-hop FSO system employing a DF relay is studied as a special case. Numerical examples are also presented to illustrate the proposed analysis and to further investigate the effects of the turbulence severity on the multihop FSO systems' performance.
Recent developments in optical communications have allowed simpler optical devices to improve network resource utilization. As such, we propose adding a lambda-monitoring device to a wavelength-routing switch (WRS) al...
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Recent developments in optical communications have allowed simpler optical devices to improve network resource utilization. As such, we propose adding a lambda-monitoring device to a wavelength-routing switch (WRS) allowing better performance when traffic is routed and groomed. This device may allow a WRS to aggregate traffic over optical routes without incurring in optical-electrical-optical conversion for the existing traffic. In other words, optical routes can be taken partially to route demands creating a sort of "lighttours". In this paper, we compare the number of OEO conversions needed to route a complete given traffic matrix using either lighttours or lightpaths
Several ways in which computer-Aided Control System Design software and rapid prototyping tools have been used to enhance the controls educational program at our university are described. A key to the use in a lecture...
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Several ways in which computer-Aided Control System Design software and rapid prototyping tools have been used to enhance the controls educational program at our university are described. A key to the use in a lecture course has been to provide the students with a computer running the software during every exam. This motivates the students to learn to use the software and facilitates giving exam problems that focus on control design and analysis rather than on mechanical calculations. The use of computer-aided design software and rapid prototyping tools in the lab saves money and allows us to do more complicated experiments and simple projects. It also allows us to emphasize aspects of networked and embedded control systems that are not covered anywhere else within our curriculum.
In this paper we look at the serial concatenation of linear block codes with a rate-1 recursive convolutional code (accumulator). In particular, we present results for extended Bose Chaudhuri Hocquenghem (eBCH) codes....
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ISBN:
(纸本)9783800729470
In this paper we look at the serial concatenation of linear block codes with a rate-1 recursive convolutional code (accumulator). In particular, we present results for extended Bose Chaudhuri Hocquenghem (eBCH) codes. These codes offer low error floors, good performance and more flexible rate choices than product codes. Reduced complexity list decoding is used to decode the eBCH codes in order to maintain low decoding complexity.
We present a novel scheme for the transmission of H.264/AVC video streams over lossy packet networks. The proposed scheme exploits the error resilient features of H.264/AVC codec and employs Reed-Solomon codes to prot...
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We present a novel scheme for the transmission of H.264/AVC video streams over lossy packet networks. The proposed scheme exploits the error resilient features of H.264/AVC codec and employs Reed-Solomon codes to protect effectively the streams. The optimal classification of macroblocks into slice groups and the optimal channel rate allocation are achieved by iterating two interdependent steps. Simulations clearly demonstrate the superiority of the proposed method over other recent algorithms for transmission of H.264/AVC streams
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