Browsing by Author "Djouadi, S. M."
Now showing items 120 of 39

Conference Object
Action functional stochastic H∞ estimation for nonlinear discrete time systems
Charalambous, Charalambos D.; Farhadi, A.; Djouadi, S. M. (2002)This paper presents an action functional, sample path optimization technique, for formulating and solving nonlinear discretetime stochastic H∞ estimation problems. These H∞ problems are formulated as minimax dynamic games ...

Conference Object
Burgers Model of Turbulence: Probabilistic Representations Free Energy and Relative Entropy
Charalambous, Charalambos D.; Djouadi, S. M. (200306)

Conference Object
Capacity of gaussian channels with noise uncertainty
Denic, S. Z.; Charalambous, Charalambos D.; Djouadi, S. M. (2004)In this paper the problem of defining, and computing the capacity of a communication channel when the statistic of an additive noise is not fully known, is addressed. The communication channel is specified as a continuous ...

Conference Object
Characterization of the Optimal Disturbance Attenuation for Nonlinear Stochastic Uncertain Systems
Charalambous, Charalambos D.; Rezaei, F.; Djouadi, S. M. (2003)This paper is concerned with an abstract formulation of stochastic optimal control systems, in which uncertainty is described by a relative entropy constraint between the nominal measure and the uncertain measure, while ...

Conference Object
A convex programming approach to the multiobjective H2/H∞ problem
Djouadi, S. M.; Charalambous, Charalambos D.; Repperger, D. W. (2002)In this paper, Banach space duality theory for the multiobjective H2/H∞ problem developed recently by the authors, is used to develop algorithms to solve this problem by approximately reducing the dual and predual ...

Conference Object
Distributed stochastic power control for timevarying longterm and shortterm fading wireless networks
Olama, M. M.; Djouadi, S. M.; Charalambous, Charalambos D.; Sahyoun, S. (2007)In this paper, new timevarying wireless channel models that capture both the space and time variations of longterm and shortterm fading wireless networks are developed. The proposed models are based on stochastic ...

Conference Object
Estimation and identification of timevarying longterm fading channels via the particle filter and the em algorithm
Ma, X.; Olama, M. M.; Djouadi, S. M.; Charalambous, Charalambos D. (2011)In this paper, we are concerned with the estimation and identification of timevarying wireless longterm fading channels. The dynamics of the fading channels are captured using a meanreverting linear stochastic differential ...

Conference Object
Estimation and identification of timevarying longterm fading wireless channels with application to power control
Olama, M. M.; Jaladhi, K. K.; Djouadi, S. M.; Charalambous, Charalambos D. (Institute of Electrical and Electronics Engineers Inc., 2007)This paper is concerned with modeling of timevarying wireless fading channels, parameter estimation, identification, and optimal power control from received signal measurements. Wireless channels are represented by ...

Conference Object
Estimation of mobile station position and velocity in multipath wireless networks using the unscented particle filter
Olama, M. M.; Djouadi, S. M.; Papageorgiou, I. G.; Charalambous, Charalambos D. (2007)This paper presents a method based on wave scattering model for tracking a user. The 3D wave scattering multipath channel model of Aulin is employed together with particle Altering to obtain mobile station location and ...

Conference Object
A general framework for continuous time power control in time varying long term fading wireless networks
Olama, M. M.; Djouadi, S. M.; Charalambous, Charalambos D. (2007)In this paper, a general framework for continuous time power control algorithm under time varying long term fading wireless channels is developed. This contrasts most of the power control algorithms introduced in the ...

Article
Information theoretic bounds for compound MIMO Gaussian channels
Denic, S. Z.; Charalambous, Charalambos D.; Djouadi, S. M. (2009)In this paper, achievable rates for compound Gaussian multipleinputmultipleoutput (MIMO) channels are derived. Two types of channels, modeled in the frequency domain, are considered when: 1) the channel frequency response ...

Conference Object
Large deviations and deterministic measures of information
Charalambous, Charalambos D.; Djouadi, S. M. (Institute of Electrical and Electronics Engineers Inc., 2003)In recent years, Large Deviations theory has found important applications in many areas of engineering and science including communication and control systems. The objective of this note is to introduce and explore connections ...

Conference Object
MIMO disturbance and plant uncertainty attenuation by feedback
Djouadi, S. M.; Charalambous, Charalambos D. (2002)This paper investigates the ability of feedback to reduce plant and disturbance uncertainties in the MIMO case, by solving two fundamental problems posed by Zames in the late seventies. The approach used here is Banach ...

Conference Object
Multiobjective H2/H∞ by banach space operator theory
Djouadi, S. M.; Charalambous, Charalambos D.; Repperger, D. W. (2001)In this paper Banach space duality theory and operator theory are combined to show that the optimal performance index in the multiobjective H2/H∞ is equal to the operator induced norm of a particular operator. This operator ...

Conference Object
On multiobjective H2/H∞ optimal control
Djouadi, S. M.; Charalambous, Charalambos D.; Repperger, D. W. (2001)In this paper the solutions to the optimal multiobjective H2/H∞ problem are characterized using Banach space duality theory, and shown to satisfy a flatness or allpass condition. Dual and predual spaces are identified, and ...

Conference Object
On optimal performance for linear timevarying systems
Djouadi, S. M.; Charalambous, Charalambos D. (2004)In this paper we consider the optimal disturbance attenuation problem and robustness for linear timevarying (LTV) systems. This problem corresponds to the standard optimal H ∞ problem for LTI systems. The problem is ...

Article
Optimal filtering over uncertain wireless communication channels
Ma, X.; Djouadi, S. M.; Charalambous, Charalambos D. (2011)In this letter, filtering over wireless communication channels subject to packet losses is considered. The packet losses are assumed to follow a Bernoulli distribution. The latter is interpreted as a special case of a ...

Conference Object
Position and velocity tracking in cellular networks using particle and Kalman filtering with comparison
Olama, M. M.; Djouadi, S. M.; Charalambous, Charalambos D. (2006)This paper presents two methods for tracking a User based on Aulin's Wave scattering channel model. The first method is based on the extended Kalman Alter approach, while the second method is based on the particle Alter ...

Article
Position and velocity tracking in mobile networks using particle and Kalman filtering with comparison
Olama, M. M.; Djouadi, S. M.; Papageorgiou, I. G.; Charalambous, Charalambos D. (2008)This paper presents several methods based on signal strength and wave scattering models for tracking a user. The receivedsignal level method is first used in combination with maximum likelihood (ML) estimation and ...

Article
Recursive Estimation and Identification of TimeVarying LongTerm Fading Channels
Olama, M. M.; Jaladhi, K. K.; Djouadi, S. M.; Charalambous, Charalambos D. (2007)