scholarly journals Study of Selection of Timing System External Clock Synchronization Methods Based on Matrix Switch Technology

2016 ◽  
Author(s):  
Wei Wu ◽  
Haidong Zou ◽  
Yupeng Zhang
Keyword(s):  
Clock Synchronization ◽  
Timing System ◽  
External Clock Synchronization ◽  
External Clock ◽  
Selection Of

scholarly journals Improvement of Physical Clock Synchronization Algorithm by Two-Level Synchronization

2013 ◽  
Vol 11 (6) ◽  
pp. 2648-2652
Author(s):  
M. Praveen Kumar Reddy ◽  
K. Ashwin Kumar ◽  
S. Rajesh Kumar ◽  
RA.K. Saravanaguru
Keyword(s):  
Distributed Systems ◽  
Clock Synchronization ◽  
Clock Drift ◽  
Common Time ◽  
Synchronization Algorithm ◽  
External Clock Synchronization ◽  
The Common ◽  
External Clock

Synchronization of the clocks is one of the essential thing for many applications in distributed systems. Clock synchronization is very important because they improve the performance and reliability of distributed systems. The main purpose of clock synchronization algorithms is to provide the common time to essential parts of the distributed systems. In this paper the problem considered is synchronization of clock with bounded clock drift and proposing a two level synchronization algorithm which synchronizes the processors local clocks by combining both internal and external clock synchronization.

Temporal Imaging System with Simple External Clock Synchronization

2009 ◽  
Author(s):  
Daniel H. Broaddus ◽  
Mark A. Foster ◽  
Onur Kuzucu ◽  
Amy C. Turner-Foster ◽  
Michal Lipson ◽  
...  
Keyword(s):  
Imaging System ◽  
Clock Synchronization ◽  
External Clock Synchronization ◽  
External Clock

A New Clock Synchronization Method for Multi-FPGA Systems

2011 ◽  
Vol 204-210 ◽  
pp. 907-910
Author(s):  
Cheng Chang Zhang ◽  
Li Sheng Yang ◽  
Xiao Ping Hu ◽  
Hong Yang ◽  
Ping Li
Keyword(s):  
Clock Synchronization ◽  
Clock Tree ◽  
Delay Locked Loop ◽  
Synchronization Method ◽  
System Clock ◽  
External Clock ◽  
Board Level ◽  
Synchronization Scheme

A novel clock synchronization scheme is proposed in this paper, which smartly takes the advantages of the inner delay-locked loop(DLL) to compensate for the delay generated by board-level feedback, combining with conventional external clock tree scheme to achieve the system clock synchronization.

scholarly journals Energy Minimization Algorithm for Estimation of Clock Skew and Reception Window Selection in Wireless Networks

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1768
Author(s):  
Michał Gorawski ◽  
Krzysztof Grochla ◽  
Rafał Marjasz ◽  
Artur Frankiewicz
Keyword(s):  
Wireless Networks ◽  
Time Window ◽  
Clock Synchronization ◽  
Window Size ◽  
Packet Transmission ◽  
Energy Utilization ◽  
Clock Skew ◽  
Window Selection ◽  
Reception Window ◽  
Selection Of

The synchronization of time between devices is one of the more important and challenging problems in wireless networks. We discuss the problem of maximization of the probability of receiving a message from a device using a limited listening time window to minimize energy utilization. We propose a solution to two important problems in wireless networks of battery-powered devices: a method of establishing a connection with a device that has been disconnected from the system for a long time and developed unknown skew and also two approaches to follow-up clock synchronization using the confidence interval method. We start with the analysis of measurements of clock skew. The algorithms are evaluated using extensive simulations and we discuss the selection of parameters balancing between minimizing the energy utilization and maximizing the probability of reception of the message. We show that the selection of a time window of growing size requires less energy to receive a packet than using the same size of time window repeated multiple times. The shifting of reception windows can further decrease the energy cost if lower packet reception probability is acceptable. We also propose and evaluate an algorithm scaling the reception window size to the interval between the packet transmission.

scholarly journals Experiences And Considerations On Performance Test Of Mosquitto-Based Broker

2021 ◽  
Vol 12 (6) ◽  
pp. 666-673
Author(s):  
Kitae Hwang Et.al
Keyword(s):  
Performance Test ◽  
Communication Protocol ◽  
Clock Synchronization ◽  
Test System ◽  
Test Program ◽  
Application System ◽  
Application Systems ◽  
Good Guide ◽  
Protocol Analyzer ◽  
Selection Of

MQTT is a communication protocol for exchanging messages between clients via MQTT broker and is used to build many IoT systems. Currently, various tools have been developed to help measure the performance of application systems using MQTT. However, because they are all versatile tools, a dedicated test system that meets the purpose of the application system needs to be built on their behalf. But building a test system is not that simple. In this paper we discuss a case of building a test system for measuring U-Mosquitto’s performance, which has modified the open source Mosquitto broker to handle urgent messages with priority, and some issues to be considered in the process. In particular, they include selection of the server computer, the structure of the test program, the use of appropriate threads for the client, the appropriate number of clients, the appropriate workload per client, clock synchronization between clients, protocol analyzer issues, and other issues. Our experiences and considerations on these issues are expected to be a good guide for building a test system to measure the performance of MQTT application systems.

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