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Towards high accuracy positioning in 5G via passive synchronization of base stations using thermally-insensitive optical fibers

Towards high accuracy positioning in 5G via passive synchronization of base stations using thermally-insensitive optical fibers
Towards high accuracy positioning in 5G via passive synchronization of base stations using thermally-insensitive optical fibers
Positioning accuracy in 5G networks (achieved via techniques based on observed time difference of arrival (OTDoA)) is limited by the synchronization error between the cellular base stations. Here, we demonstrate that these base stations can be synchronized entirely passively through the use of emerging forms of hollow core fiber (HCF) as the data transmission medium in the 5G front-haul network. This is possible due to the excellent thermal stability of HCF which allows the synchronization error among cellular base stations to be reduced significantly as compared to systems based on standard single mode fibers. Reducing this synchronization error is necessary to meet the strict timing requirements envisaged for 5G networks. We analyze the polarization mode dispersion, chromatic dispersion, and thermal stability of the HCF and give suggestions on how to use the HCF to balance overall radio over fiber (RoF) link performance in 5G front-haul networks. In a proof of concept experiment we show that HCF links enable the positioning error (calculated with the OTDoA method) to be reduced down to the centimeter level even when subject to tens of degrees Celsius temperature variations. This represents a 20-fold improvement over standard single mode fiber systems which would require active compensation schemes to achieve similar levels of time synchronization accuracy.
2169-3536
113197-113205
Zhu, Wenwu
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Numkam Fokoua, Eric
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Chen, Yong
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Bradley, Thomas
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Sandoghchi, Seyed Reza
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Ding, Meng
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Jasion, Gregory
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Petrovich, Marco
bfe895a0-da85-4a40-870a-2c7bfc84a4cf
Poletti, Francesco
9adcef99-5558-4644-96d7-ce24b5897491
Zhao, Mingshan
bf289b4a-245b-467f-a926-dab8ffe2054c
Richardson, David
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Slavík, Radan
2591726a-ecc0-4d1a-8e1d-4d0fd8da8f7d
Zhu, Wenwu
224a96dc-9793-43c5-a43d-78630e179de8
Numkam Fokoua, Eric
6d9f7e50-dc3b-440a-a0b9-f4a08dd02ccd
Chen, Yong
0bfb3083-4cd2-4463-a7a4-f48c4158b15a
Bradley, Thomas
d4cce4f3-bb69-4e14-baee-cd6a88e38101
Sandoghchi, Seyed Reza
654977fa-6c6e-4b24-aece-7ac52027fe17
Ding, Meng
45fbd64c-522d-45ff-a918-013404105cdb
Jasion, Gregory
16cfff1d-d178-41d1-a092-56e6239726b8
Petrovich, Marco
bfe895a0-da85-4a40-870a-2c7bfc84a4cf
Poletti, Francesco
9adcef99-5558-4644-96d7-ce24b5897491
Zhao, Mingshan
bf289b4a-245b-467f-a926-dab8ffe2054c
Richardson, David
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Slavík, Radan
2591726a-ecc0-4d1a-8e1d-4d0fd8da8f7d

Zhu, Wenwu, Numkam Fokoua, Eric, Chen, Yong, Bradley, Thomas, Sandoghchi, Seyed Reza, Ding, Meng, Jasion, Gregory, Petrovich, Marco, Poletti, Francesco, Zhao, Mingshan, Richardson, David and Slavík, Radan (2019) Towards high accuracy positioning in 5G via passive synchronization of base stations using thermally-insensitive optical fibers. IEEE Access, 7, 113197-113205. (doi:10.1109/ACCESS.2019.2934982).

Record type: Article

Abstract

Positioning accuracy in 5G networks (achieved via techniques based on observed time difference of arrival (OTDoA)) is limited by the synchronization error between the cellular base stations. Here, we demonstrate that these base stations can be synchronized entirely passively through the use of emerging forms of hollow core fiber (HCF) as the data transmission medium in the 5G front-haul network. This is possible due to the excellent thermal stability of HCF which allows the synchronization error among cellular base stations to be reduced significantly as compared to systems based on standard single mode fibers. Reducing this synchronization error is necessary to meet the strict timing requirements envisaged for 5G networks. We analyze the polarization mode dispersion, chromatic dispersion, and thermal stability of the HCF and give suggestions on how to use the HCF to balance overall radio over fiber (RoF) link performance in 5G front-haul networks. In a proof of concept experiment we show that HCF links enable the positioning error (calculated with the OTDoA method) to be reduced down to the centimeter level even when subject to tens of degrees Celsius temperature variations. This represents a 20-fold improvement over standard single mode fiber systems which would require active compensation schemes to achieve similar levels of time synchronization accuracy.

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More information

Accepted/In Press date: 2 August 2019
e-pub ahead of print date: 13 August 2019
Published date: August 2019

Identifiers

Local EPrints ID: 437372
URI: http://eprints.soton.ac.uk/id/eprint/437372
ISSN: 2169-3536
PURE UUID: 793719da-69d1-42a1-a3e6-0520829f7fc8
ORCID for Eric Numkam Fokoua: ORCID iD orcid.org/0000-0003-0873-911X
ORCID for Yong Chen: ORCID iD orcid.org/0000-0003-0383-6113
ORCID for Thomas Bradley: ORCID iD orcid.org/0000-0001-6568-5811
ORCID for Seyed Reza Sandoghchi: ORCID iD orcid.org/0000-0003-2196-3167
ORCID for Gregory Jasion: ORCID iD orcid.org/0000-0001-5030-6479
ORCID for Marco Petrovich: ORCID iD orcid.org/0000-0002-3905-5901
ORCID for Francesco Poletti: ORCID iD orcid.org/0000-0002-1000-3083
ORCID for David Richardson: ORCID iD orcid.org/0000-0002-7751-1058
ORCID for Radan Slavík: ORCID iD orcid.org/0000-0002-9336-4262

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Date deposited: 29 Jan 2020 17:30
Last modified: 15 Sep 2021 05:42

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