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Real Time Clocks Versus Virtual Clocks [chapter]

Krzysztof R. Apt, Jean-Luc Richier
1986 Control Flow and Data Flow: Concepts of Distributed Programming  
symmetric distributed termination algorithms are systematically developed.  ...  Solutions are first presented in an abstract setting of Dijkstra, Feijen and Van Gasteren [DFGJ and then gradually transformed into solutions to the distributed termination problem of Francez [FJ.  ...  It is incremented by one at the places Where before the clock was consulted, i.e. where the assignment T:=CLOCK-TIMEi took place and is synchronized with other clocks in the same way as before.  ... 
doi:10.1007/978-3-642-82921-5_11 fatcat:jdtipjnugvecpbubmcs24swafi

Aerial Vehicles Tracking Using Noncoherent Crowdsourced Wireless Networks [article]

Hazem Sallouha, Alessandro Chiumento, Sofie Pollin
2021 arXiv   pre-print
This article first presents an analysis of the effects of lack of clock synchronization in ATM with CWN and provides solutions based on the presence of few trustworthy sensors in a large non-coordinated  ...  In this work, we propose an ATM solution by exploiting noncoherent crowdsourced wireless networks (CWNs) and correcting the inherent clock-synchronization problems present in such non-coordinated sensor  ...  For instance, with LSTM-based synchronization, Figure 9 shows a roughly 3% difference in performance between the scenarios with one GSN and three GSNs.  ... 
arXiv:2108.00922v1 fatcat:jswl7gqv2ja2rnn6ud4mxb342a

Detecting global predicates in distributed systems with clocks

Scott D. Stoller
2000 Distributed computing  
This paper proposes a framework for detecting global state predicates in systems of processes with approximately-synchronized real-time clocks.  ...  Complexity analysis shows that under reasonable assumptions, these real-time-clock-based detection algorithms are less expensive than detection algorithms based on Lamport's happened-before ordering.  ...  In most local-area distributed systems, protocols like NTP can e ciently maintain synchronization of clocks to within a few milliseconds 26 .  ... 
doi:10.1007/s004460050069 fatcat:rpcg2od24rgzdk4p4sjvcf2ipe

Detecting global predicates in distributed systems with clocks [chapter]

Scott D. Stoller
1997 Lecture Notes in Computer Science  
This paper proposes a framework for detecting global state predicates in systems of processes with approximately-synchronized real-time clocks.  ...  Complexity analysis shows that under reasonable assumptions, these real-time-clock-based detection algorithms are less expensive than detection algorithms based on Lamport's happened-before ordering.  ...  In most local-area distributed systems, protocols like NTP can e ciently maintain synchronization of clocks to within a few milliseconds 26 .  ... 
doi:10.1007/bfb0030684 fatcat:xmg5ovmznffsjhbwj3ilidnlya

A SYNCHRONOUS WIDEBAND FREQUENCY-DOMAIN METHOD FOR LONG-DISTANCE CHANNEL MEASUREMENT

Chu-Feng Hu, Zhou Zhou, Shu Xia Guo
2013 Electromagnetic Waves  
Its core consists of: (1) baseband signal generators at the transmission terminal and the reception terminal respectively are used to generate the wideband signal of the same frequency; (2) the two GPS  ...  This paper proposes a novel synchronous wideband frequency domain method for measuring time domain response of longdistance channel.  ...  The two ends of measurement system were synchronized in frequency and phase with the external reference of 10 MHz generated by a rubidium clock.  ... 
doi:10.2528/pier13013012 fatcat:xijkc2o23fdarfhrrqg3b7eefq

Implementation of a general-purpose stored-program digital optical computer

Todd Main, Robert J. Feuerstein, Harry F. Jordan, Vincent P. Heuring, John Feehrer, Carl E. Love
1994 Applied Optics  
The architecture is also the first to employ time-of-flight synchronization. That is, there are no flip-flops used as synchronizing memory elements.  ...  The authors are with the Optoelectronic Computing Systems Center, University of Colorado at Boulder, Boulder, Colorado 80309-0525.  ...  Synchronization was accomplished by electrically stretching the pulse at a C terminal and by clock gating.  ... 
doi:10.1364/ao.33.001619 pmid:20862187 fatcat:guxwfihnnza7jfyolenz3gcvza

A taxonomy of distributed termination detection algorithms

Jeff Matocha, Tracy Camp
1998 Journal of Systems and Software  
An important problem in the ®eld of distributed systems is that of detecting the termination of a distributed computation.  ...  Distributed termination detection (DTD) is a dicult problem due to the fact that there is no simple way of gaining knowledge of the global state of the system.  ...  As opposed to Rana's clock (Rana, 1983 ), Mayo and Kearns create an algorithm for``roughly synchronized clocks''.  ... 
doi:10.1016/s0164-1212(98)10034-1 fatcat:mmknad2ftfewjhb45qy6yjpp2a

Design Techniques for Streamlined Integration and Fault Tolerance in a Distributed Sensor System for Line-crossing Recognition

Chung-Ching Shen, Roni Kupershtok, Shuvra S. Bhattacharyya, Neil Goldsman
2007 2007 16th International Conference on Computer Communications and Networks  
This provides a general method for achieving such synchronization with reduced hardware requirements and reduced energy consumption compared to conventional approaches, which rely on generic interface  ...  Such applications involve resource-limited embedded sensor nodes that communicate with each other through self-organizing protocols.  ...  Moreover, every time a node receives a valid packet from its neighbor, it carries out the clock synchronization scheme with its neighbor so that clock drift is prevented.  ... 
doi:10.1109/icccn.2007.4318007 dblp:conf/icccn/ShenKBG07 fatcat:yji4dnuynncxnee4wz4xmn36wa

Experimental Demonstration of Delay-Bounded Wireless Network Based on Precise Time Synchronization [article]

Haruaki Tanaka
2022 arXiv   pre-print
This paper experimentally demonstrates the fundamental principles of CSMA/AP by constructing a star-topology wireless network using software-defined radio terminals combined with precise time synchronization  ...  Indeed, Yamasaki et al. proposed a new delay-bounded wireless MAC protocol named Carrier Sense Multiple Access with Arbitration Point (CSMA/AP), exploiting precise time synchronization among all devices  ...  The PPS signals that the Wi-Wi modules provide have synchronization errors that roughly follow a normal distribution with 3σ = 400 ns [19] .  ... 
arXiv:2207.00158v1 fatcat:odpo3gzp4zb7jmy3zmtvhi3iba

Flexible and Reconfigurable Mismatch-Tolerant Serial Clock Distribution Networks

Atanu Chattopadhyay, Zeljko Zilic
2012 IEEE Transactions on Very Large Scale Integration (vlsi) Systems  
The system uses a closed-loop synchronization phase to combine the clock skew reduction of an actively synchronized clock network with an open-loop operating phase that minimizes power consumption like  ...  We present a clock distribution network that emphasizes flexibility and layout independence.  ...  a sinusoidal forward phase clock with a reverse phase clock produced by reflecting the forward clock off of a ground termination at the opposite end of the conductor [22] .  ... 
doi:10.1109/tvlsi.2011.2104982 fatcat:g2gfz5uwxje4xcokb6i7h4xxg4

Self-stabilization of Byzantine Protocols [chapter]

Ariel Daliot, Danny Dolev
2005 Lecture Notes in Computer Science  
Many distributed tasks (e.g. clock synchronization) possess ecient non-stabilizing solutions tolerating Byzantine faults or conversely non-Byzantine but self-stabilizing solutions.  ...  The synchronized pulses are used as events for initializing Byzantine agreement on every node's local state. The set of local states is used for global predicate detection.  ...  Acknowledgements: We wish to thank Shlomi Dolev and Hanna Parnas for stimulating discussions with regards to the current result.  ... 
doi:10.1007/11577327_4 fatcat:jitv2iqw55be5cv3ikwso4tqze

A Low-Overhead Asynchronous Interconnection Network for GALS Chip Multiprocessors

Michael N. Horak, Steven M. Nowick, Matthew Carlberg, Uzi Vishkin
2010 2010 Fourth ACM/IEEE International Symposium on Networks-on-Chip  
The network eliminates the need for global clock distribution, and can interface multiple synchronous timing domains operating at unrelated clock rates.  ...  components operate at the same clock rate, with stable but unknown phase differences) and plesiochronous (all components operate at nominally identical clock rates, but with slight frequency mismatch)  ...  Detection circuits generate signals to stall synchronous terminals in order to to prevent overrun or underrun conditions in the FIFO.  ... 
doi:10.1109/nocs.2010.14 dblp:conf/nocs/HorakNCV10 fatcat:qjzzqw7qufgu5eb2tmrgk7oxza

Design of a SPDIF receiver using protocol compiler

Ulrich Holtmann, Peter Blinzer
1998 Proceedings of the 35th annual conference on Design automation conference - DAC '98  
The design was done with Protocol Compiler, a high-level synthesis tool for the design of structured data stream processing controllers.  ...  The data bit rate is roughly 2.8 MHz allowing transmissions of audio samples with frequencies up to 44 KHz. The clock speed of the code bits is consequently about 5.6 MHz.  ...  Since the receiver runs on a higher clock speed than the SPDIF source and both clocks are not synchronized, one has to allow for variances in the pattern at the receiver side.  ... 
doi:10.1145/277044.277243 dblp:conf/dac/HoltmannB98 fatcat:wx6mqzo43jcm3dfylhkq2uq7oa

Space-time reference with an optical link

P Berceau, M Taylor, J Kahn, L Hollberg
2016 Classical and quantum gravity  
With a well-defined orbit and a synchronized clock, the satellite cold serve as a high-accuracy Space-Time Reference, providing precise time worldwide, a valuable reference frame for geodesy, and independent  ...  We describe a method for realizing a high-performance Space-Time Reference (STR) using a stable atomic clock in a precisely defined orbit and synchronizing the orbiting clock to high-accuracy atomic clocks  ...  The STR approach could be used to transfer Time (epoch) and frequency from high-performance clocks at national standards labs to relatively small transportable ground terminals, with roughly 30 cm receive  ... 
doi:10.1088/0264-9381/33/13/135007 fatcat:y4cnfomnwfgf5ko5ppswfqbnwe

On-Chip Surfing Interconnect [chapter]

Suwen Yang, Mark Greenstreet
2012 Advanced Circuits for Emerging Technologies  
We use distributed varactors to dynamically vary the latency of LC interconnects and thus effect surfing.  ...  Chains of these surfing buffers attenuate jitter making them well suited for source-synchronous interconnect.  ...  Such chains can be used in clock distribution networks or for clock forwarding for source-synchronous communication. Here, our focus is on source synchronous designs.  ... 
doi:10.1002/9781118181508.ch16 fatcat:n2ijhbjlrbe63bi6vhbrwexa3a
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