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In most approximation techniques for implementing a variable fractional delay, like Lagrange interpolation, the magnitude response varies considerably with the delay. Instead, it would be desirable to keep the magnitude response the same for all delay values. In this paper, we propose a novel method for optimizing the parameters of the least-squared error spline transition band fractional delay FIR...
The Lyapunov second method is developed for linear coupled system of delay differential and functional equations. By conventional approaches such equations may be reduced to the neutral systems and the known results for the latter may be exploited. In the present paper we introduce a new approach by constructing Lyapunov-Krasovskii functional that corresponds directly to the descriptor form of the...
In this paper we propose classical control theory to look at the end-to-end congestion control algorithm used by the Transmission Control Protocol/Internet Protocol (TCP/IP). By using this approach we show that classical control modeling using Laplace transforms and Smith's principle give a simple and rigorous model of the role played by congestion window and advertised window variables in today's...
In this paper, LPV identification and gain-scheduling (GS) control of a sewer system composed by a detention tank and a single reach sewer is proposed. First, a linear parameter-varying (LPV) control-oriented model for the single reach canal is presented and identified using LPV identification methods. Then, LPV GS theory is used to designing a PI GS controller guaranteeing performance and stability...
We consider a class of nonlinear time-variant infinite dimensional a class retarded systems governed by functional-differential equations in a Banach space. It is assumed that the linear part of the equations is unbounded variable operator and the nonlinearities satisfy the local Lipschitz conditions. A solution estimate is derived. By virtue ofthat estimate stability conditions are established.
This paper presents a new method for symbol estimation in the downlink of a CDMA communication system. Our approach is based on the observation that the slowly-fading CDMA signal model may be expressed as a linear combination of the convolved independent symbol sequences. A blind source separation approach based on maximization of output entropy is used for the blind separation of the sources; the...
This paper describes a solution to a consensus problem whereby a group of agents evolve in continuous-time and exchange information at discrete instants of times. In the setup adopted each agent is viewed as a node in a graph, its evolution is represented by a scalar node variable, and all agents seek to agree on a common value. The agents are allowed to exchange information among each other but only...
In this paper, robust fault detection using a parity equation passive robust approach based on generating an adaptive threshold considering that the system to be monitored can be described by an interval linear parameter varying (LPV) model with variable transport delay is proposed. This approach allows to consider parameters and associated uncertainty intervals dependence on the operating point....
This work presents different results on the stability of linear time-delay systems by a simple method derived from the Nyquist criterion. The main characteristic is the simplicity of the stability tests, maintaining analysis rigour. Based on this simple stability test, delay-independent and delay-dependent stability criteria are derived, being possible the statement of those criteria as numerically...
Typical digital implementations of feedback controllers periodically measure the state, compute the control law, and update the actuators. Although periodicity simplifies the analysis and implementation, it results in a conservative usage of resources. In this paper we drop the periodicity assumption in favor of self-trigger strategies that decide when to measure the state, execute the controller,...
This work considers the problem of stabilization of first order linear systems subject to a relatively large input-output time delay. As it is known, the stability analysis of this type of systems becomes difficult due to the dead-time term involved. The proposed prediction scheme has a similar structure of a Smith predictor scheme together with a output injection compensation to guarantee predictor...
We consider nonlinear control systems with encoded feedback over delayed data-rate-limited communication channels. It is assumed that a smooth static state feedback exists, which renders the closed loop system ISS with respect to measurement noise, if there is no delay nor any data rate restriction. For this case we present an encoder/decoder scheme for which it can be shown that semi-global asymptotic...
The present work presents an integrated hybrid predictive control strategy to optimize the real time operations of a public transport system, where the control actions applied dynamically to buses are combined with signal priority strategies. A traffic simulator is integrated into a simulation platform of a public transport system. Each of the strategies proposed is tested and validated separately...
In this paper, we study a joint inventory and routing problem (IRP) for the food supply chain and we investigate the impact of customer satisfaction level under the optimization of the total expected cost. We propose a new bi-objective mathematical model by taking into account multi capacitated vehicles for perishable products from one supplier to many customers by considering total traveling time...
The Alamouti coded Space Frequency Block Code (SFBC) based Orthogonal Frequency Division Multiplexing (OFDM) scheme is upon analyzed by assuming that the Channel Frequency Response (CFR) remains constant over Alamouti code period (two adjacent OFDM subcarriers). But when the channel is highly frequency selective, this assumption does not hold good and causes inter-symbol-interferences (ISI). Thus,...
AODV protocol is a comparatively more popular on demand routing protocol in mobile ad hoc networks. However, reliability in terms of data communication is not much satisfactory in traditional AODV. This paper presents an AODV with end to end reliability (AODV-EER). The main idea of proposed modification in AODV is to find the route with lowest drop rate from source to destination. We also propose...
A new group delay representation, which yields value zero for periodic signals irrespective to the initial phase and the relative level of each harmonic component. This new group delay representation provides a unified basis for defining "aperiodicity" in speech sounds. For example, the periodic to noise ratio or harmonic to noise ratio is directly derived from the deviation of this group...
Dynamic Voltage Restorer (DVR) injects a compensated voltage to mitigate undesirable impacts on critical loads due to voltage sag/swell. In this work the controllers for DVR is proposed in stationary reference frame and injects a voltage which is in phase with the positive sequence of grid voltage. The method for load reference generation for stationary reference frame control is highly determinantal...
Adders play an important role in digital circuits. Logarithmic adders are efficient in delay reduction of carry generation/propagation in contrary to linear adders. It is found from simulations that even logarithmic adders suffer from delay, chip area over head and additional latches in the presence of ripple carry adders at the time of FPGA realization. The main motive of this work is to design and...
A delay-dependent functional observer is designed for linear time-invariant (LTI) systems with time-varying input delay. Compared to delay-free observers, delay-dependent functional observers are less conservative and cover more systems. The designed functional observer is with minimum possible order (minimal). Necessary and sufficient conditions of the existence of the observer and asymptomatic stability...
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