Corpus ID: 55964735


  author={John P. Lowe and Matthew J. Deutch and Glenn K. Nelson and Douglas S. Sutton and William C. Yates and Peder Hansen and Oren Eliezer and Tom Jung and Stephen Morrison and Yingsi Liang and Dinesh Rajan and Sidharth Balasubramanian and Arun Ramasami and Waleed Khalil},
The WWVB broadcast of the time-code signal has undergone no major changes in its communications protocol and modulation scheme since its introduction in 1963. [...] Key Result The new protocol and modulation scheme being introduced by NIST effectively addresses these problems, and will enable greatly improved reception of the WWVB broadcast without affecting existing devices. This backward-compatibility is achieved by maintaining the existing AM characteristics while adding various new features through phase…Expand
WWVB time signal broadcast: an enhanced broadcast format and multi-mode receiver
To improve the station's coverage, an enhanced broadcast format, based on the addition of phase modulation (PM), was deployed in 2012 and its enhanced features enable more reliable receiver performance and greater time-keeping accuracy at reduced power consumption. Expand
Receiver Design of Radio-Controlled Clocks Based on the New WWVB Broadcast Format
The architecture and algorithms for the first all-digital radio-controlled clock receiver for the new WWVB broadcast format and two alternative timing synchronization approaches are investigated, showing that the correlation-based synchronization technique reduces the implementation complexity by over 50%, while its performance is only less than 1 dB inferior to that of the ML-based technique. Expand
Interference-robustness improvement in BPSK receivers for the enhanced WWVB broadcast
Radio controlled clocks (RCCs) based on the WWVB broadcast, commonly referred to as “atomic clocks”, might experience relatively high levels of on-frequency interference from the equivalent MSFExpand
A new broadcast format and receiver architecture for radio controlled clocks
A digital receiver architecture, amenable to integration in a CMOS system-on-chip (SoC), is proposed, which relies on digital signal processing, thereby eliminating the need for the crystal filter and other passive components found in existing receivers. Expand
For over fifty years the Physikalisch-Technische Bundesanstalt (PTB) has disseminated time signals and standard frequency by means of the low-frequency transmitter DCF77. In addition, since the 1970sExpand
A multi-mode software-defined CMOS BPSK receiver SoC for the newly enhanced WWVB atomic clock broadcast
The first receiver system-on-chip (SoC) for the newly enhanced phase-modulation based WWVB broadcast is presented. Having an extensively digital architecture, and relying on the new features of theExpand
WWVB: A Half Century of Delivering Accurate Frequency and Time by Radio
  • M. Lombardi, Glenn K. Nelson
  • Computer Science, Medicine
  • Journal of research of the National Institute of Standards and Technology
  • 2014
A history of the National Institute of Standards and Technology (NIST) radio station WWVB is provided, from its origins as a source of standard frequency, to its current role as the source of time-of-day synchronization for many millions of radio controlled clocks. Expand
Sequential Frame Synchronization Based on Hypothesis Testing With Unknown Channel State Information
This paper analytically shows that hypothesis testing can have better reliability and lower energy consumption than point estimation if the probability of false alarm of the hypothesis testing is lower than the minimum of two thresholds. Expand


Increasing the Modulation Depth of the WWVB Time Code to Improve the Performance of Radio Controlled Clocks
  • J. Lowe, J.C. Allen
  • Physics
  • 2006 IEEE International Frequency Control Symposium and Exposition
  • 2006
The National Institute of Standards and Technology radio station WWVB has officially changed its broadcast format. As of January 1, 2006 the WWVB broadcast signal has increased the depth of the timeExpand
Introduction to "Synchronous Communications"
This paper is particularly significant because it was the first to demonstrate that carrier phase could be reliably recovered from the received signal using a structure that has come to be known as the Costas Loop. Expand
WWVB Improvements: New Power From an Old Timer
Abstract : In response to advancements in receivers and increased emphasis of traceability of frequency to the national standard, the time-and-frequency radio station, WWVB, of the National InstituteExpand
WWVB Radio Controlled Clocks: Recommended Practices for Manufacturers and Consumers (2009 edition) | NIST
This NIST Recommended Practice Guide was written to provide guidance to both manufacturers and consumers of radio controlled clocks to help them select and purchase radio controlled clock products, to learn how the products work, and to help troubleshoot reception problems. Expand
International Radio Consultative Committee
AbstractThe Xth Plenary Assembly of the C.C.I.R. is scheduled to be held in New Delhi from 16 January to 15 February 1963. This is the first meeting of the C.C.I.R. to be held in India and for thatExpand
We Help Move Time through the Air
  • Radio World, March
  • 2011
Time dissemination via the LF transmitter DCF77 using a pseudo-random phase-shift keying of the carrier”, 2 European Frequency and Time Forum
  • 1988
Digital Communications