Propagation Characteristics
We need to know time, frequency and spatial selectivity of channel (fast fading). The larger the time selectivity the longer time (delay) needed for good performance
Need to know average received power from slow (lognormal) fading and path loss versus distance.
Assuming a VERY well designed coding and modulation system, performance is dependent only on the average received signal-to-interference ratio and not on the distribution. For uncoded systems this is not true.