Browsing by Subject "Signal processing"
Now showing items 120 of 23

Article
A biologically inspired networking model for wireless sensor networks
(2010)Wireless sensor networks have emerged in strategic applications such as target detection, localization, and tracking, where the large scale renders centralized control prohibitive. In addition, the finite batteries of the ...

Conference Object
A broadband balun using metamaterial phaseshifting lines
(2005)A 3port device that converts a singleended input to a differential output over a large bandwidth is presented. The balun comprises a Wilkinson divider, followed by a +90° negativerefractiveindex (NRI) metamaterial (MM) ...

Article
A broadband series power divider using zerodegree metamaterial phaseshifting lines
(2005)A metamaterial 1:4 series power divider that provides equal power split to all four output ports over a large bandwidth is presented, which can be extended to an arbitrary number of output ports. The divider comprises four ...

Conference Object
Capacity for MIMO systems at low SNR
(2010)The paper introduces an asymptotic series expansion for the mutual information of MultipleInput MultipleOutput (MIMO) channels. For low signal to noise ratio (SNR) the first term of expansion approaches mutual information ...

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Determining model accuracy as a function of inputs and system parameters
(American Society of Mechanical Engineers (ASME), 2004)Vital to the effectiveness of simulationbased design is having a system model of known quality. Previous research introduced an algorithm called AVASIM for assessing model validity systematically and quantitatively. AVASIM ...

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Distributed minimumtime weight balancing over digraphs
(IEEE Computer Society, 2014)We address the weightbalancing problem for a distributed system whose components (nodes) can exchange information via interconnection links (edges) that form an arbitrary, possibly directed, communication topology (digraph). ...

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Distributed stopping for average consensus in directed graphs via a randomized eventtriggered strategy
(IEEE Computer Society, 2014)We consider how an iterative strategy for asymptotic average consensus in a directed graph (digraph) can be adapted so that the nodes can determine, in a distributed manner, a stopping criterion that allows them to terminate ...

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Faulttolerant discretetime linear timeinvariant filters
(Institute of Electrical and Electronics Engineers Inc., 2000)Modular redundancy, the traditional approach to fault tolerance, is prohibitively expensive because of the overhead in replicating the hardware. In this paper we discuss alternative methods for obtaining faulttolerant ...

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Minimax rate distortion for a class of sources
(2010)This paper deals with rate distortion or source coding with fidelity criterion, in measure spaces, for a class of source distributions. The class of source distributions is described by a relative entropy constraint set ...

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Optimal preprocessing strategies for perfect reconstruction of binary signals under powerconstrained transmission
(2004)In this paper we further explore our deterministic worstcase framework for perfect reconstruction of discrete data transmissions through dispersive communication channels. Specifically, we are concerned with perfect ...

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Optimum immigration policies based on linear quadratic theory
(2010)In this paper, it is demonstrated that the Theory of Linear Quadratic is applicable in deriving optimum immigration policies, while maintaining population and immigration levels close to certain prespecified reference ...

Doctoral Thesis Open Access
Outage and ergodic capacity for a class of channels
(Πανεπιστήμιο Κύπρου, Πολυτεχνική Σχολή / University of Cyprus, Faculty of Engineering, 201304)Η χρήση πολλαπλών κεραιών τόσο στον πομπό όσο και στον δέκτη σε ασύρματα συστήματα (ΜΙΜΟ) αποτελεί μια πολύ ενεργή ερευνητική περιοχή τα τελευταία χρόνια λόγω των εξαιρετικών βελτιώσεων στην επίδοση σε σύγκριση με τα ...

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Outage capacity and probability for a class of MIMO channels
(2010)This paper is concerned with outage capacity and probability of MultipleInput MultipleOutput (MIMO) systems for a class of channel distributions. The results illustrate how outage probability and capacity degrade as a ...

Article
Outage probability under channel distribution uncertainty
(2012)Outage probability and capacity of a class of blockfading MIMO channels are considered under partial channel distribution information. Specifically, the channel or its distribution is not known but the latter is known to ...

Article
Probabilistic approaches to fault detection in networked discrete event systems
(2005)In this paper, we consider distributed systems that can be modeled as finite state machines with known behavior under faultfree conditions, and we study the detection of a general class of faults that manifest themselves ...

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Robust capacity of a Gaussian noise channel with channel and noise uncertainty
(2005)This paper is concerned with the problem of defining, and computing the capacity of a continuoustime additive Gaussian noise communication channel when the true frequency response of the channel, and the power spectral ...

Article
Stochastic differential equations for modeling, estimation and identification of mobiletomobile communication channels
(2009)Mobiletomobile networks are characterized by node mobility that makes the propagation environment time varying and subject to fading. As a consequence, the statistical characteristics of the received signal vary continuously, ...

Article
Structural modification. Part 1: Rotational receptances
(2005)The inverse problem of assigning natural frequencies and antiresonances by a modification to the stiffness, mass and damping of a structure is addressed. Very simple modifications such as the addition of masses and grounded ...