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Pilot patterns are experimentally investigated to characterize the frequency/time dependence of the optical orthogonal frequency division multiplexing (OFDM) signal transmission. The optical signal performance is evaluated in terms of error vector magnitude (EVM). It is shown that, the quality of the OFDM signals can be improved up to 4dB in EVM, for 10Gb/s, 16-QAM-encoded OFDM signals after 20km...
Pilot pattern and pilot density are often used for channel estimation in optical/electronic orthogonal frequency division multiplexing (OFDM) systems. To enhance the performance of the channel estimation of OFDM systems, the transmission of the OFDM signals is experimentally investigated via different pilot tone arrangements for effective channel estimation. Three types of pilot patterns (comb-type,...
We propose a novel approach to compensate the fiber chromatic dispersion (CD) and to adjust the phase/amplitude using two pilot tones in fiber optical OFDM transmission. In the conventional channel estimation methods, one or more symbols have to be applied as the pilot tones. The new approach makes full use of the fiber CD properties while using less pilot tones. The simulations show a significant...
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