Propagation Conditions
To obtain high quality and high availability of the service offered by 802.16, line-of-sight radio propagation is required. The SS requires highly directional antennas to minimize the multipath and interferences. Multipath can cause intersymbol interference (ISI) and is not desirable.
The predominant fade mechanism deals with rain attenuation in the 10- to 66-GHz frequency region. Fade depth is a function of rain rate and dependent on the frequency of operation and distance. An internationally accepted method for computation of rain-fade attenuation probability is that defined by ITU-R P.530-8. For any given SS and BS, the maximum cell radius depends upon the rain-fade factor.
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