Open AccessFrequency Synchronization Based on a Cascading Cross‐Correlation Function for CO‐FBMC‐OQAM
Author(s) -
Wang Daobin,
Chen Bo,
Lyu Ningning,
Wang Wei,
Liu Junjie,
Yuan Lihua
Publication year - 2020
Publication title -
chinese journal of electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.267
H-Index - 25
eISSN - 2075-5597
pISSN - 1022-4653
DOI - 10.1049/cje.2020.05.019
Subject(s) - frequency offset , offset (computer science) , computer science , frequency domain , orthogonal frequency division multiplexing , synchronization (alternating current) , carrier frequency offset , amplitude , control theory (sociology) , filter bank , residual , dc bias , electronic engineering , algorithm , telecommunications , physics , optics , engineering , electrical engineering , channel (broadcasting) , control (management) , artificial intelligence , computer vision , programming language , voltage
We present a robust frequency synchronization algorithm for the Coherent optical Offset quadrature‐amplitude modulation based Filter‐bank multicarrier (CO‐FBMC‐OQAM) systems. It is a two‐stage method operating in the frequency domain, which expands the estimated range of the normalized fractional frequency offset to (‐1, +1). We designed and introduced a cascading cross‐correlation function of real‐valued pilots to roughly estimate the frequency offset in the first stage. The residual frequency offset was accurately tracked by a non‐cascading cross‐correlation function afterwards. This approach enlarges the maximum estimated range, and also resists interference and noise. A CO‐FBMC‐OQAM system with the sampling rate of 50 Gsample/s was numerically investigated to evaluate the frequency‐offset estimation and compensation capability. All obtained results prove that the proposed frequency synchronization method can correct the laser‐frequency offset and improve the transmission performance significantly.