Conference paper Open Access

FPGA-Based Testbed for Synchronization on Ethernet Fronthaul with Phase Noise Measurements

Joary Paulo; Igor Freire; Ilan Sousa; Chenguang Lu; Miguel Berg; Igor Almeida; Aldebaro Klautau

Cloud radio access network (C-RAN) is a recent trend of RAN architecture positioned to help the operators to address challenges of new wireless services, such as emerging 4G and 5G mobile networks. C-RAN uses baseband processing units in a central server which connects to the radio front-ends at cell sites via the so-called fronthaul network. The fronthaul infrastructure is currently provided by CPRI (Common Public
Radio Interface) and OBSAI (Open Basestation Architecture Initiative) industry standards which use dedicated optical links with high deployment costs. An alternative is to use Ethernet technology aiming to reuse of network infrastructure available in many commercial buildings. However, in contrast to the
traditional synchronous fronthaul, Ethernet suffers with packet delay variation (PDV) and challenging synchronization recovery.
This work presents a complete and flexible testbed to evaluate Ethernet-based fronthaul. The system is validated via extensive measurements that show the effects of synchronization procedures and network impairments on regenerated clock phase noise.

© 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. This work was supported in part by the Innovation Center, Ericsson Telecomunicacoes S.A., Brazil, the Capes Foundation, Brazil, and by the European Union through the 5GCrosshaul project (H2020-ICT-2014/671598).
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