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Appl. Sci. 2017, 7(7), 655; doi:10.3390/app7070655

Modified Godard Timing Recovery for Non Integer Oversampling Receivers

ETH Zurich, Institute of Electromagnetic Fields (IEF), Zurich 8092, Switzerland
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Received: 19 May 2017 / Revised: 18 June 2017 / Accepted: 21 June 2017 / Published: 24 June 2017
(This article belongs to the Special Issue Optical Signal Processing: Advances and Perspectives)
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Abstract

A timing recovery algorithm is introduced that operates with less than two samples per symbol and provides an enormous complexity reduction. The complexity reduction is due to a synergy with the already existing Fourier transforms in a coherent receiver, an avoidance of terms that are dominated by noise, and a complete elimination of multiplications. A simulation and an experiment with a single carrier modulation format show that the inherent timing jitter is, despite of the significant complexity reduction, comparable with the state of the art, and in particular outperforms the Godard algorithm for low roll-off factors. In addition, it is one of the few algorithms that operates with less than two samples per symbol in the frequency domain, and thus enables the lowest complexity in a receiver. View Full-Text
Keywords: optical communication; timing recovery; sampling phase estimation; field programmable gate array (FPGA)-based real-time processing optical communication; timing recovery; sampling phase estimation; field programmable gate array (FPGA)-based real-time processing
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Josten, A.; Baeuerle, B.; Dornbierer, E.; Boesser, J.; Hillerkuss, D.; Leuthold, J. Modified Godard Timing Recovery for Non Integer Oversampling Receivers. Appl. Sci. 2017, 7, 655.

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