Abstract
A new methodology is proposed for the modeling of practical uncoded
bit and power loading schemes for OFDM, based on the assumption of a uniform
transmit power spectrum. The accuracy of this technique, both in terms of
predicted maximum data rate and occupied bandwidth, is demonstrated analytically
for an Intensity Modulated/Direct Detected (IM/DD) system over Step Index
Plastic Optical Fibers (SI-POF). It is shown that both this new methodology
and the well known water pouring theorem accurately predict the maximum achievable
data rate in practical uncoded systems; however, it is also demonstrated that
the new methodology is a better predictor of the bandwidth occupied by the
transmit signal, thus providing an important analytical tool for system designers.The analysis presented is also experimentally verified using an IM/DD
optical system employing a directly modulated Resonant Cavity Light Emitting
Diode (RCLED) light source and several lengths of 1 mm SI-POF.
© 2011 IEEE
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