• 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 Eytan 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…

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.

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.

Interference-robustness improvement in BPSK receivers for the enhanced WWVB broadcast

An interference cancellation technique is proposed, to further enhance the performance of the coherent BPSK receiver, achieving an additional 14 dB improvement in interference rejection.


The advantages of DCF77, in particular its wide range of reception with low cost receivers, have led through the years to the use of millionsDCF77 radio-controlled clocks which provide exact time throughout central Europe.

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 and demonstrates 2-3 orders of receiver sensitivity superiority when compared to receiver ICs designed for the legacy WWVB Broadcast.

WWVB: A Half Century of Delivering Accurate Frequency and Time by Radio

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.

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.

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.



Increasing the Modulation Depth of the WWVB Time Code to Improve the Performance of Radio Controlled Clocks

  • J. LoweJ.C. Allen
  • Business
    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 time

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.

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 Institute

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.

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 that

An Introduction to the Bootstrap

Statistics is the science of learning from experience, especially experience that arrives a little bit at a time. The earliest information science was statistics, originating in about 1650. This

We Help Move Time through the Air

  • Radio World, March
  • 2011

Digital Communications

Time dissemination via the LF transmitter DCF77 using a pseudo-random phase-shift keying of the carrier”, 2 European Frequency and Time Forum

  • 1988