The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We propose an asynchronous, decentralized algorithm for consensus optimization. The algorithm runs over a network of agents, where the agents perform local computation and communicate with neighbors. We design the algorithm so that the agents can compute and communicate independently at different times and for different durations. This reduces the waiting time for the slowest agent or longest communication...
In this paper, we propose a simple yet effective parametric adaptive filter (PAF) and demonstrate its excellent performance in acoustic echo cancellation applications. Specifically, the proposed PAF decomposes an adaptive filter into three components: a normalized finite impulse response filter, a gain factor and a time-shift factor. With a novel update scheme for the PAF, these three components can...
Wireless sensor networks (WSNs) have increasingly become the viable means of distributed sensing and control for a wide array of applications. The energy-sensitive sensor nodes in these systems are often augmented by an energy harvesting device, allowing for continuous operation. The drawback, however, is that the availability of communication resources is uncertain. Decentralized optimization is...
The consensus of double-integrator discrete-time multi-agent system is studied based on the second-order neighbors' information in this paper. The comparison between the convergence rate of second-order neighbor protocol and the one of general protocol is analyzed. Considering there exists delay in communication, the consensus condition of double-integrator discrete-time multi-agent system with delay...
By using iterative learning control method, we study the output tracking problem for a class of singular linear systems with state delays. For a given singular linear delay system, we give a kind of closed-loop PD-type iterative learning control algorithm. Then we discuss the convergence conditions of the closed-loop PD-type iterative learning control algorithm, and analyze completely the convergence...
The IP Multimedia Subsystem (IMS) seems to be the technology that will prevail in Next Generation Networks (NGN s), since the interworking environment and the service flexibility that this technology offers to the currently deployed wireless broadband technologies makes it appealing to users, service developers and network operators. In this paper a heterogeneous network model based on the IMS that...
This paper presents a state observer for drift observable nonlinear systems when output measurements are affected by a known and bounded time varying delay. The proposed observer is an improvement over our previous work in [15] and it includes a delay-dependent gain to attain exponential convergence to zero of the estimation error. The result is illustrated through an application to nonlinear systems...
Dual decomposition coupled with the subgradient method has found application to optimal resource management in communication networks, as it can lead to distributed and scalable algorithms. Network entities—nodes or functional layers—exchange Lagrange multipliers and primal minimizers of the Lagrangian function towards optimizing a network-wide performance metric. It is of interest to study the performance...
In this paper, we propose an adaptive observer for nonlinear systems with slope restricted nonlinearities, unknown parameters and delayed outputs. The delay is assumed constant and the unknown parameter is assumed piece-wise constant. Based on the Lyapunov-krasovskii approach, we show that, for sufficiently small values of the time-delay, both state estimation and parametric convergence are ensured...
We analyze the convergence of gradient-based optimization algorithms that base their updates on delayed stochastic gradient information. The main application of our results is to gradient-based distributed optimization algorithms where a master node performs parameter updates while worker nodes compute stochastic gradients based on local information in parallel, which may give rise to delays due to...
This paper proposes a discontinuous-impulsive output feedback which is a sampled based second order sliding mode controller. First, constructive convergence conditions are established for the controller, in the unperturbed and perturbed case. An adaptation mechanism is based on the aforementioned convergence conditions and allows to reduce gain magnitude.
The present work reports a sufficient condition for the consensus of a network of nonidentical Euler-Lagrange (EL) systems with variable time-delays in the communications. The EL-systems are controlled by simple Proportional plus damping (P+d) schemes and the interconnection network is modeled as an undirected weighted graph. Additionally, for the case without delays, the paper reports a new Strict...
This paper considers a class of generalized convex games where each player is associated with a convex objective function, a private convex inequality constraint and a private convex constraint set. The component functions are potentially non-smooth. The players aim to compute a Nash equilibrium through communicating with neighboring players. We study two distributed computation algorithms and show...
In this paper, a constrained consensus problem is studied in unbalanced networks in the presence of communication delays. Here each agent needs to lie in a closed convex set while reaching a consensus. The communication graphs considered are directed, dynamically changing, and not necessarily balanced and only the union of the graphs is assumed to be strongly connected among each time interval of...
We propose a framework that allows to study hybrid systems with delays through generalized concepts of solutions. Such generalized solutions have proved to be suitable for the analysis and design of hybrid control systems. Extending these concepts to systems with delays is motivated by control applications where hybrid feedback control laws play an important role but delays are often inevitable. Our...
It is promising to enhance the spatial domain diversity for the conventional coordinated multi-point (CoMP) transmission/reception over the heterogeneous network structure of relay stations and home base stations in addition to conventional base stations. However, supporting potentially massive mobile stations (MSs) is the critical challenge in the heterogeneous network CoMP (Het-CoMP), which results...
In this paper, the authors present a proof-of concept demonstrator for an adaptive inter-system-interface gateway between LMR and IP based networks. To underline the flexibility of the proposed solution, a satellite link is utilized to enable the integration of an independent LMR cell or direct connected terminals (MicroSpot) into an existing infrastructure over long distances without the need for...
A multiple-input multiple-output (MIMO) channel equalization scheme for time-varying wireless channels is proposed. The proposed equalization technique uses set-membership affine projection (SM-AP) algorithm for updating filter weights of a decision feedback equalizer (DFE). The performance of the proposed scheme is investigated through simulations using wireless channel models recommended by International...
The purpose of this paper is to present performance characteristics of a quick response digital peak-current-mode 380V dc-dc converter for the green IT system. A proto-type is constructed as the digital control dc-dc converter used in the higher voltage direct current (HVDC) system for the green IT. The proto-type uses the digital peak-current-mode control to show a superior transient response. A...
Optical-wireless convergence is becoming one of the evolutionary technologies to provide quality-of-service (QoS) guaranteed ubiquitous access to end users. In this paper, we analyze the effect of GEPON cycle-length on the QoS performance of the GEPON-LTE converged network, when different resource handling mechanisms are used. The simulation results indicate that the influence of different cycle-lengths...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.