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In this paper, we address the energy-efficient contact discovery issue in Pocket Switched Networks (PSNs), in which the nodes' mobility pattern shows strong social property. In a PSN, although the end-to-end connection may be disconnected most of the time for a given source-destination pair, several nodes periodically gather at certain hot spots and form well connected clusters. Based on such mobility...
Based on IEEE 802.15.4, a contention-free period (CFP) adopts guarantee time slot (GTS) mechanism to ensure each device can access the radio channel. However, it is hard to get the authority to access the radio channel due to more competitors access the radio channel simultaneously. To cope with this issue, we proposed a guarantee time slot mechanism to enhance the performance and utilization of using...
The synchronous programming model is perfect for modeling, simulation, verification and implementation of reactive systems. While this paradigm can be directly implemented as hardware circuits, multithreaded software implementations are typically based on asynchronous threads. For this reason, an efficient multithreaded software implementation of a synchronous program requires a so-called desynchronization...
Today, local data networks, many last-mile access networks and even some backbone networks are based on packet transmission protocols, especially the Ethernet. Generally, there are several protocols and standards, which could be used for the purpose of clock distribution (synchronization) over packet networks. One of the most accurate protocols is Precision Clock Synchronization Protocol (PTP, IEEE...
We present the Arbitrating Value Transfer Protocol (AVTP), a deterministic binary countdown algorithm for multi-hop wireless networks. AVTP enables deterministic arbitration among contending nodes within a given hop radius, which may be chosen to reach network-wide arbitration, thereby exceeding the capabilities of existing protocols. In addition, the deterministic agreement on data values among all...
In this paper, we described time synchronization performances with Precise Time Protocol (PTP). The synchronization experiments between a master clock and slave clocks were performed for two cases, that is, one with direct connection and the other with switches. From the experiments, the followings were observed. In the case of direct connection, actual and average offsets between the master and the...
Femtocell technology has drawn considerable attention as a cost-effective mean to improve cellular coverage and capacity. Data loading and offloading to the macro Base Station (mBS) is supported through internet backhaul which exhibits the uniqueness of this technology. Interference is one of the most challenging phenomenon's that arise due to the non-synchronized femtocell. It is known that fBS and...
In this paper, the problem of impulsive synchronization of a kind of generalized complex dynamical systems with delay and derivative coupling is investigated. Both the communication delay and derivative coupling, which provide more information about the complex dynamical systems, are considered. Based on a new Lyapunov function and impulsive stability technique that is used to play an important role...
Synchronization of chaotic system has become an important area of study. A chaotic system is a nonlinear deterministic system that possesses complex and unpredictable behaviour. Based on nonlinear state coupling, this paper derived a delay independent sufficient exponential synchronization condition based on the Lyapunov stability method and the Halanay inequality lemma. The proposed condition is...
The asymptotic synchronization problem of a class of uncertain and delayed chaotic systems is addressed with adaptive compensation designs in this paper. General uncertainties on systems and time-delays in the coupling network are eliminated by the adaptive control scheme, as well as its circuit realization are proposed. Then, an approach that is based on application of Lyapunov stability theory for...
This paper discusses the synchronization problem for a class of Lurie type complex dynamical networks with time-varying delay. Based on a Lyapunov-Krasovskii functional, some new delay-dependent synchronization criteria are derived in the form of linear matrix inequalities by employing a delay decomposition and free matrix method. And a strategy for synchronization is presented based on a linear feedback...
In this paper, we proposed an asynchronous wave-pipelined Serializer and Deserializer, or WP-SERDES in brief, that is totally clock-free. In contrast to conventional SERDES that employ power hungry phase-locked loops (PLLs) for synchronization in serializers and clock-data recovery (CDR) circuits in deserializers, the proposed WP-SERDES employs delay elements (DEs) consisting of inverter chains for...
Clock gating is one of the important techniques to achieve low power and small area in high-performance synchronous circuit design. In this paper, we propose a three-phase clock gating optimization methodology by using clustering and merging algorithm to construct a gated clock tree with minimal number of clock gating cells and buffers. In addition, according to the fan-out numbers of a clock gating...
This study proposes an energy detection based time synchronization scheme for IR-UWB systems. The proposed synchronization scheme may achieve symbol timing synchronization within a symbol interval. The mean square error (MSE) performance of the proposed scheme is compared with that of the TDLC algorithm, in both residential line-of-sight (LOS) and non-line-of-sight (NLOS) propagation environments...
Motion canceling bilateral control (MCBC) is a method to synchronize motion of a teleoperation robot and a target, while an operator can obtain tactile sensation of the remote target. This interface helps the operator by taking a task and reduces his/her workload. However, the delay caused by the sensors deteriorates the synchronization performance and transparency of the MCBC. Therefore, synchronization...
In this paper, we describe a mobile application that synchronizes the playback of a video stream among a group of mobile devices while the video playback is controlled (e.g. pause, resume, seek) by one of the devices. This feature allows a group of people to collaborate remotely in real-time through watching the same video on their mobile devices. To make this application work for heterogeneous mobile...
Small playback lag in live streaming is important for time-critical and interactive applications such as live stock, market updates, sports and remote education. In this paper, we present Elite addresses the playback lag problem in peer-assisted live streaming systems. Instead of deploying a large initial offset to all the users, Elite seeks the possibility of initializing users with layered proportional...
The synchrophasor technology has become focus of many theoretical, conceptual and practical studies lately due to an increased opportunity to improve power system reliability and security through enhanced monitoring, protection and control. The paper provides a survey of signal processing, communication and networking issues surrounding this topic so that professionals from related areas can benefit...
This paper addresses the problem of indoor location for devices that are connected to WLAN. Nowdays most of the smart terminals: mobile phones, portable computers and tablets are WLAN enabled. Location of these devices is of interest to network security issues as well as employee and company security and reliability. Most of the algorithms on the market use triangulation as a basic rule for location...
Parallelization of big-data analytics services over a federation of heterogeneous clouds has been considered to improve performance. However, contrary to common intuition, there is an inherent tradeoff between the level of parallelism and the performance for big-data analytics principally because of a significant delay for big-data to get transferred over the network. The data transfer delay can be...
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