correspondingly. In WiMAX system, High frequency signal
was transmitted by fiber between BS and SS where the
functions of signal processing and control are completed in BS,
and SS only takes charge of receiving and sending RF (Radio
Frequency) signal and the transformation between optical and
electrical signal, so that the SS doesn’t take responsible for
modulation and demodulation of the signal . Using RoF, the
structure of SS is simplified and the design of communication
network become flexible. The principle framework is shown in
Figure 7.