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Considering the great influence of the residual frequency offset on the phase estimate in burst-mode communication systems, the symmetrical frame structure is applied to the joint frequency-phase estimate. Firstly, based on a general data frame structure, the Cramer-Rao Bounds(CRBs) for asymmetrical burst and symmetrical burst with DA/NDA synchronization mode are given. Secondly, the concept of symmetrical...
Based on model reference adaptive control (MRAC), a MRAC synchronous controller is designed. And the reference model of the MRAC is determined according to the linear mathematical model of the electro-hydraulic servo system. Then the synchronous controller is applied to position synchronization of two cylinders system. The experiment results show that the proposed controller can effectively reduce...
This paper presents an IntraBody Communication (IBC) based receiver front end module design. By introducing Binary Signal Recovery (BSR) module with Blind Oversampling Clock and Data Recovery (BOCDR) synchronization technique, the proposed receiver achieves data speed-2.5Mb/s and transmission distance-170cm with 1.84e-6 Bit Error Rate (BER). In the proposed IBC receiver, distorted and noisy signal...
In this paper, we consider the problem of synchronized path following for multiple underactuated autonomous underwater vehicles subject to parametric modeling uncertainty and unmodeled dynamics. Nonlinear path following controllers are proposed for individual vehicles that yield convergence of the position tracking errors to a small neighborhood of the origin. Vehicles coordination is reached through...
This paper is concerned with the coordinated tracking of linear multi-agent systems with a dynamic leader. The input of the leader is time-varying and cannot be obtained by any follower agents. Distributed iterative learning controllers are developed based on the relative state information of neighboring agents. Lyapunov-Krasovskii functionals are used to show the stability properties of the closed-loop...
This paper is concerned with the synchronized path following problem of multiple underactuated autonomous underwater vehicles (AUVs) in the presence of uncertain dynamics and input constrains. Nonlinear path following controllers are proposed for individual AUV that yield convergence of the position tracking errors to a small neighborhood of the origin. Vehicles coordination is achieved by synchronizing...
The practical applications of wireless sensor networks require robust time synchronization. In this paper we describe the Flooding Time Synchronization Protocol (FTSP) that provides time synchronization service in such networks. We found there are Key nodes and Non-key nodes when using FTSP in the case of temperature interference. This protocol was designed to utilize low communication bandwidth,...
For communications and networking channels, coding techniques are widely used to correct errors in corrupted messages. The “Quality of Protection” (QoP) that can be provided via error correction directly affects the “Quality of Service” (QoS) experienced by users. The errors are commonly assumed to be substitution or erasure errors. Such systems rely on perfect synchronization so that no bit is deleted...
Distributed beamforming has the great potential of performance improvement in wireless networks while the carrier synchronization overhead will reduce its performance gain. In this paper the effects of carrier synchronization on link throughput of distributed beamforming is studied. The expressions of the frequency and initial phase used by each cooperative node are derived for the existing round-trip...
Workflow management systems (WfMSs) have gained increasing attention recently as an important technology to improve information system development in dynamic and distributed organizations. However the absence of verification facilities in most WfMSs causes the resulting implementation of large and complex workflow models to be at risk of undesirable runtime executions. This problem of design validation...
With the development of mobile devices, researchers pay more and more attention to application software based on it. Currently, most animation making software is oriented for professional people, which are tedious and complex on operation. It is difficult for novices to understand the making animation process. Aimed at removing the complexity barrier and allowing nonprofessional users to create a...
Based on the works of S-W Lei and V.K.N. Lau, we propose a novel adaptive interleaving scheme for the application in orthogonal frequency division multiplexing (OFDM) systems. The new scheme has improved the original one in the following two aspects: (1) We have derived the equivalent bit level channel state information thus the symbol level interlever is changed to the bit level; (2) We have modified...
Though XML is applied intensively in a lot of applications, XML parsing is not practical in many fields because of its poor performance. Parallel XML parsing on multi-core is a promising choice. Previous methods all adopt data parallel approach on XML parsing. As the semi-structured nature of XML, they were obliged to divide the data into well-formed XML chunks and then parse these chunks parallel...
Particle image velocimetry with out-trigger synchronization system developed by the authors was applied to investigate the flow patterns and hemo-compatibility in the blood pumps. The results showed that: the particle image velocimetry with outer trigger realized the continuous sample of velocity in one flow path in the pumps; both the absolute velocity and relative velocity varied with impeller design,...
This paper mainly aims at BPSK signals to establish and validate a timing estimation method named as WP.Z algorithm that uses two samples/symbol sampling rate and its modified algorithm. Both of them have been carried on modeling and simulating in detail and their performance is evaluated under various parameters. It is not only discussed the accuracy, astringency and applied bound between two algorithms,...
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