eprintid: 10184978
rev_number: 8
eprint_status: archive
userid: 699
dir: disk0/10/18/49/78
datestamp: 2024-01-08 14:18:01
lastmod: 2024-12-20 07:10:04
status_changed: 2024-01-08 14:18:01
type: article
metadata_visibility: show
sword_depositor: 699
creators_name: Clark, Kari A
creators_name: Zhou, Zichuan
creators_name: Liu, Zhixin
title: Clock synchronizing radio access networks to picosecond precision using optical clock distribution and clock phase caching
ispublished: pub
divisions: UCL
divisions: B04
divisions: C05
divisions: F46
note: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
abstract: Performing positioning of future mobile devices using trilateration through radio access networks would provide a robust alternative to currently used global navigation satellite systems. However, the positioning accuracy is strongly dependent on the time synchronization accuracy of the antennas used as location reference points. Consequently, achieving sub-30 cm positioning accuracies requires the synchronization of radio access network antennas to sub-nanosecond accuracy. Here we show a clock phase synchronization and optical clock signal distribution approach to clock synchronization in radio access networks that achieves 0.98-ps root-mean-square precision clock synchronization, in a real-time field-trial demonstration on 37.6-km dark fiber, with optical clock frequency synchronization and clock phase caching operating using 25.6-Gb/s commercial transceivers. We quantify the clock synchronization performance of our approach using standard metrics, including time deviation (TDEV) and mean time interval error (MTIE). Furthermore, we estimate the impact of varying the phase update rate used in clock phase caching on the clock synchronization performance of our approach. Through our two combined approaches, we explore a route towards achieving sub-nanosecond clock synchronization in radio access networks.
date: 2024-01-01
date_type: published
publisher: Optica Publishing Group
official_url: http://dx.doi.org/10.1364/jocn.500459
oa_status: green
full_text_type: other
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 2135363
doi: 10.1364/jocn.500459
lyricists_name: Clark, Kari
lyricists_name: Liu, Zhixin
lyricists_id: KACLA99
lyricists_id: ZLIUB50
actors_name: Clark, Kari
actors_id: KACLA99
actors_role: owner
full_text_status: public
publication: Journal of Optical Communications and Networking
volume: 16
number: 1
pagerange: A89-A89
issn: 1943-0620
citation:        Clark, Kari A;    Zhou, Zichuan;    Liu, Zhixin;      (2024)    Clock synchronizing radio access networks to picosecond precision using optical clock distribution and clock phase caching.                   Journal of Optical Communications and Networking , 16  (1)   A89-A89.    10.1364/jocn.500459 <https://doi.org/10.1364/jocn.500459>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10184978/1/Clark2023.pdf