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5 Gbit/s real-time processing using π/4-shift DQPSK for bidirectional radio-over-fibre system

: Habel, K.; Fernandez del Rosal, L.; Weide, S.; Hilt, J.; Jungnickel, V.; Elschner, R.; Schubert, C.; Frey, F.; Fischer, J.K.; Freund, R.


Jaworski, M. ; Institute of Electrical and Electronics Engineers -IEEE-; IEEE Photonics Society:
17th International Conference on Transparent Optical Networks, ICTON 2015. Vol.1 : Budapest, Hungary, 5 - 9 July 2015
Piscataway, NJ: IEEE, 2015
ISBN: 978-1-4673-7880-2
ISBN: 978-1-4673-7881-9
International Conference on Transparent Optical Networks (ICTON) <17, 2015, Budapest>
Fraunhofer HHI ()

Future converged fixed-mobile networks need high-speed radio links in deployment scenarios where fibre is not available or too expensive. In this paper, we present a field-programmable gate array (FPGA)-based real-time transmission system using standard 10G Ethernet interfaces. The system comprises two parallel complex-valued data channels in each direction. Standard FPGAs and low-cost multi-channel analogue-to-digital converters (ADCs) and digital-to-analogue converters (DACs) have been used. For enhanced robustness and optimal usage of the power amplifier, pi/4-shift differential quaternary phase-shift keying (DQPSK) modulation is used. All digital signal processing routines for synchronization, equalization, forward error correction etc. have been fully implemented and tested. Using a protocol analyzer, error-free bidirectional transmission of Ethernet frames at 5 Gbit/s is verified. Error-vector magnitude (EVM) values below -30 dB indicate that even higher speeds could be realized.