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.
This paper proposes a time and frequency synchronization technique for MIMO OFDM system by employing the loosely synchronous (LS) codes as the training sequences. The auto-correlation functions of all LS codes are ideal, and there exists an interference-free window (IFW) or a zero correlation zone (ZCZ) in their cross-correlation functions of the LS codes around the origin. These properties of the...
Time synchronization is one of core technologies in distributed systems and communication fields. The "Network Time Protocol" (NTP) is the current widely accepted standard for synchronizing clocks over the Internet. NTP uses a hierarchical scheme in order to synchronize the clocks in the network. It mainly adopts a phase-locked loop technique to adjust the local clock. This paper develops...
The synchronous computational model with its simple computation and communication mechanism makes it easy to describe, simulate and formally verify synchronous embedded systems at a high level of abstraction. In synchronous models, a local refinement increasing the delay in a single computation block may affect the functionality of the entire model. We provide a synchronization algorithm that preserves...
We consider a formation control system where individual systems are controlled by a path-following design and the path variables are to be synchronized. We first show a passivity property for the path following system and, next, combine this with a passivity-based synchronization algorithm developed in Arcak, M. (2006), The passivity approach expands the classes of synchronization schemes available...
Precise positioning is one attractive application of ultra wideband (UWB) systems. Its enormous bandwidth has generated high expectation on the spatial resolution that it could achieve. However, synchronization in the presence of dense multipath is challenging, since the first arrival is not necessarily the strongest one due to channel fading. It is unclear how high a spatial resolution can be realized...
This paper presents a new synchronization algorithm for grid connection of a doubly fed induction generator (DFIG) in wind generation system. A stator flux-oriented vector control is used for the variable speed DFIG operation. By controlling the generator excitation current the amplitude of the stator EMF is adjusted equal to the amplitude of the grid voltage. To set the generator frequency equal...
This paper presents a new synchronization algorithm for grid connection of a doubly fed induction generator (DFIG) in wind generation system. A stator flux-oriented vector control is used for the variable speed DFIG operation. By controlling the generator excitation current the amplitude of the stator EMF is adjusted equal to the amplitude of the grid voltage. To set the generator frequency equal...
Synchronization is of concern in AC power systems. Existing synchronization algorithms are hardware intensive. A single phase synchronization scheme referred to as a multi-rate phase locked loop (MPLL) has been reported. The stability of the MPLL is influenced by amplitude variations. An amplitude estimation module based on a fast Fourier transform (FFT) algorithm and an automatic gain control (AGC)...
The management of ad-hoc networks raises interesting problems, that are particularly challenging for networks of mobile nodes. Considering the inherent complexity of these systems, the development of distributed applications relying on wireless communication protocols would be greatly simplified by the use of specific tools for supporting testing and step-by-step debugging. In this paper we describe...
This paper presents a comparative study of state-change complexity in optimum- and linear-time synchronization algorithms for a large-scale of cellular automata. We implement most of the synchronization algorithms developed so far and investigate their state-change complexities on a computer. The state-change complexity in several synchronization algorithms on two-dimensional arrays is also studied.
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.