Efficient Timing/Frequency Synchronization Based on Sparse Fast Fourier Transform

Jianing Lu, Qiong Wu, Hexun Jiang, Songnian Fu, Ming Tang, Chao Lu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

5 Citations (Scopus)


Efficient synchronization is of great importance for fiber optical coherent communication system. Here, we propose an accurate and low-complexity timing/frequency synchronization scheme based on sparse fast Fourier transform (S-FFT). The proposed scheme consists of coarse timing/frequency synchronization, fine timing synchronization, and fine frequency synchronization. Inspired by the idea of S-FFT, we take full advantages of the sparse nature of training symbols (TSs) and realize the synchronization in the frequency domain. The proposed scheme enables accurate timing synchronization at low signal-to-noise ratio (SNR) region. A complete frequency offset estimation (FOE) range of [-symbol rate/2, + symbol rate/2] can be realized with high resolution. Finally, the proposed scheme is experimentally verified through 10 Gbaud dual-polarization (DP) 16/32-quadrature amplitude modulation (QAM) transmission, without the BER performance penalty. In particular, the total computation complexity is reduced by nearly 200 times in comparison with that using conventional sliding window correlation scheme.

Original languageEnglish
Article number8782553
Pages (from-to)5299-5308
Number of pages10
JournalJournal of Lightwave Technology
Issue number20
Publication statusPublished - 15 Oct 2019


  • Coherent communications
  • digital signal processing
  • optical fiber communication

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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