Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Timing Offset and Timing Stability for Dual-Clock Systems

Published

Author(s)

Joshua Kast, Jeanne Quimby, Jake Rezac, Stefania Romisch

Abstract

In this work, we describe a mathematical framework for evaluating timing offset and timing noise in channel sounders, based on a second-order deterministic model, and a stochastic metric based on the Allan Deviation. Using this framework, we analyze the timing offset and timing noise for a 1-6 GHz correlation-based channel sounder which uses rubidium clocks to synchronize the transmitter and receiver. We study timing behavior in three clock-distribution configurations. In the "untethered" configuration, the transmitter and receiver each have a rubidium clock, and no physical timing cable is connected between the clocks. In the "tethered" configuration, a coaxial cable synchronizes timing between the two separate clocks. Finally, a benchmark "single-clock" configuration is used where a single rubidium clock drives the transmitter and receiver. We analyze the experimental channel-sounder data for timing offset using a second-order clock model. Next, we perform a qualitative analysis of the timing noise processes using Time Deviation, a modified form of the Allan Deviation. From these analyses, we gain insight into the sources of timing offset and timing noise in our correlation-based channel sounder.
Citation
IEEE Antennas and Propagation Magazine

Keywords

5G technology, channel sounder, millimeter-wave wireless communication, propagation channel, system timing, Time Allan Deviation, timing errors, timing noise, timing offset, wireless system

Citation

Kast, J. , Quimby, J. , Rezac, J. and Romisch, S. (2021), Timing Offset and Timing Stability for Dual-Clock Systems, IEEE Antennas and Propagation Magazine, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=929258 (Accessed January 23, 2022)
Created May 4, 2021