This paper considers an asynchronous direct-sequence code division multiple access (DS-CDMA) communication system over an AWGN channel. We are interested in estimating the propagation delay from the diierent users to the receiver. The Cram er-Rao bound for such an estimator is derived and compared with the measured variance of three algorithms. The performance of the classical correlation-based...

– By analysing the diffusive dynamics of epidemics and of distress in complex networks, we study the effect of the assortativity on the robustness of the networks. We first determine by spectral analysis the thresholds above which epidemics/failures can spread; we then calculate the slowest diffusional times. Our results shows that disassortative networks exhibit a higher epidemiological thresh...

Parameter estimation of polynomial phase signals (PPSs) is of great interest in various practical applications. In this paper, parametric methods for parameter estimation of polynomial phase signals are discussed and compared. The suboptimal maximum likelihood estimation methods, such as the high-order ambiguity function (HAF) and the product HAF (PHAF) are presented. The polynomial time freque...

An algorithm is presented for propagating the effect of single or multiple faults in a system modeled by a cognitive map. The cognitive map is a directed causal graphs that can be used to model complex dynamic system. Also shown is the propagation of variance estimates of uncertainty associated with the presence of a fault and with the arcs, representing strength of causality, in the cognitive ...

This paper concerns the propagation of particles through a quenched random medium. In the oneand two-dimensional models considered, the local dynamics is given by expanding circle maps and hyperbolic toral automorphisms, respectively. The particle motion in both models is chaotic and found to fluctuate about a linear drift. In the proper scaling limit, the cumulative distribution function of th...

We extend recently developed schemes for field quantization in absorbing dielectric media with local susceptibilities to dielectric systems described by a nonlocal susceptibility, in order to quantize the electromagnetic field in quantum wells embedded in planar semiconductor microcavities. As an application of the formalism, we analyze the effects of the propagation through a semiconductor mic...

Contents 1 Introduction 143 2 Derivation of NLSE from wave propagation 144 3 Derivation of NLSE from BEC 146 3.1 Dimensionless GPE 148 3.2 Reduction to lower dimension 148 4 The NLSE and variational formulation 150 4.1 Conservation laws 150 4.2 Lagrangian structure 151 4.3 Hamiltonian structure 152 4.4 Variance identity 153 5 Plane and solitary wave solutions of NLSE 157 6 Existence/blowup resu...

We present the behavior of a sensitivity measure defined to evaluate the impact of model inaccuracies over the posterior marginal density of the variable of interest, after the evidence propagation is executed, for extreme perturbations of parameters in Gaussian Bayesian networks. This sensitivity measure is based on the Kullback-Leibler divergence and yields different expressions depending on ...