Abstract
This work introduces a novel symbol time synchronization method for
optical fast orthogonal frequency-division multiplexing (FOFDM) systems. The
first arrival path of a channel is well known to be related to the best symbol
time; however, few approaches exploit this fact. In contrast, the basic idea
of this study is to derive an estimate of channel-coefficient power using
the periodic property of the discrete cosine transform (DCT) in FOFDM. The
proposed method maximizes the effective signal power (ESP), which is defined
as the signal power excluding the intersymbol interference (ISI), within the
DCT window using the obtained channel-coefficient power. Simulations reveal
that the proposed estimator exhibits low complexity and robustness against
the presence of chromatic dispersion (CD).
© 2012 IEEE
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