Abstract
Orthogonal frequency-division multiplexing (OFDM) can compensate for
linear distortions, such as group-velocity dispersion (GVD) and polarization-mode
dispersion (PMD), provided the cyclic prefix is sufficiently long. Typically,
GVD is dominant, as it requires a longer cyclic prefix. Assuming coherent
detection, we show how to analytically compute the minimum number of subcarriers
and cyclic prefix length required to achieve a specified power penalty, trading
off power penalties from the cyclic prefix and from residual inter-symbol
interference (ISI) and inter-carrier interference (ICI). We derive an analytical
expression for the power penalty from residual ISI and ICI.
© 2008 IEEE
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