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6
FIBER-BASED OFDM TRANSMISSION SYSTEMS
This ripple may require a reduction of the transmitted power in order to obey
regulatory spectrum masks, that is, the transmitted power cannot be made as
large as it potentially could, because of the “overshoot” in the power density.
This power reduction may lead to a loss in the signal to noise ratio at the
receiver, since the transmitted power usually has to stay inside regulatory
spectrum masks.
On the other hand, in [P20] a spectral method of carrier tracking is presented,
where the mentioned ripple is used in order to provide an estimate of the carrier
offset.