The Experts below are selected from a list of 20721 Experts worldwide ranked by ideXlab platform

Mei Leng - One of the best experts on this subject based on the ideXlab platform.

Khalid A Qaraqe - One of the best experts on this subject based on the ideXlab platform.

  • on maximum likelihood estimation of clock offset and skew in networks with exponential delays
    IEEE Transactions on Signal Processing, 2008
    Co-Authors: Qasim M Chaudhari, Erchin Serpedin, Khalid A Qaraqe
    Abstract:

    Clock synchronization represents a crucial element in the operation of wireless sensor networks (WSNs). For any general time synchronization protocol involving a two-way Message Exchange mechanism, e.g., timing synch protocol for sensor networks (TPSN) [see S. Ganeriwal, R. Kumar, and M. B. Srivastava, "Timing Synch Protocol for Sensor Networks," in Proceedings of the First International Conference on Embedded Network Sensor Systems," 2003, pp. 138-149], the maximum likelihood estimate (MLE) for clock offset under the exponential delay model was derived in [D. R. Jeske, ";On the Maximum Likelihood Estimation of Clock Offset," IEEE Transactions on Communications, vol. 53, no. 1, pp. 53-54, January 2005] assuming no clock skew between the nodes. Since all practical clocks are running at different rates with respect to each other, the skew correction becomes important for achieving long term synchronization since it results in the reduction of the number of Message Exchanges and hence minimization of power consumption. In this paper, the joint MLE of clock offset and skew under the exponential delay model for a two way timing Message Exchange mechanism and the corresponding algorithms for finding these estimates are presented. Since any time synchronization protocol involves real time Message Exchanges between the sensor nodes, ML estimates for other synchronization protocols can be derived by employing a similar procedure. In addition, due to the computational complexity of the MLE, a simple, computationally efficient and easy to implement algorithm is presented as an alternative to the ML estimator which particularly suits the low power demanding regime of wireless sensor networks.

Yik-chung Wu - One of the best experts on this subject based on the ideXlab platform.

  • Low-Complexity Maximum-Likelihood Estimator for Clock Synchronization of Wireless Sensor Nodes Under Exponential Delays
    IEEE Transactions on Signal Processing, 2011
    Co-Authors: Mei Leng, Yik-chung Wu
    Abstract:

    In this paper, the clock synchronization for wireless sensor networks in the presence of unknown exponential delay is investigated under the two-way Message Exchange mechanism. The maximum-likelihood estimator for joint estimation of clock offset, clock skew and fixed delay is first cast into a linear programming problem. Based on novel geometric analyses of the feasible domain, a low-complexity maximum likelihood estimator is then proposed. Complexities of the proposed estimators and existing algorithms are compared analytically and numerically. Simulation results further demonstrate that our proposed algorithms have advantages in terms of both performance and computational complexities.

P C Saxena - One of the best experts on this subject based on the ideXlab platform.

  • one round authenticated identity based tri partite key agreement protocol for internet of things based sensors
    Social Science Research Network, 2018
    Co-Authors: Mahender Kumar, P C Saxena
    Abstract:

    Key Exchange protocol is a cryptographic protocol that provides a secure communication in the sensor network in which sensor devices have low power and low memory. Joux proposed the key agreement protocol for three-party based on the pairing. Later many schemes have been proposed for three-party but could not suitable for the sensor network. In this article, we proposed one-round three-party authenticated ID-based key establishment protocol for sensor network whose security is based on solving ECDLP and BDHP. We show that our proposed scheme is secure against man-in-middleattack, perfect forward secrecy, no key control, and Known session key security. The proposed system has less computational cost, bandwidth cost and Message Exchange as compared to the other related schemes.

Nan Lin - One of the best experts on this subject based on the ideXlab platform.

  • Design and Implementation of Message Router in Enterprise Service Bus
    Computer Engineering, 2011
    Co-Authors: Nan Lin
    Abstract:

    Message router is the core component of Enterprise Service Bus(ESB) and its design directly affects the system integration performance.To solve the problems such as service discovery and mapping,concurrency control and life-cycle management of Message Exchange,this paper presents a JBI-based Normalized Message Router(NMR) and mainly introduces its the architecture,Message routing algorithm and Message Exchange state machine.An application demo is given to verify the efficiency,reliability and safety of the NMR in complicated enterprise integration environment.