
Advanced Multipath Channel Modelling
  The basic Rayleigh or Rician Model gives the PDF
of envelope
  but: - How fast does the signal fade?
 -   How wide in bandwidth are fades?
 
 
 
Typical systems engineering questions:
-   How long can a packet last to avoid fades?
 - 
  For frequency diversity, how far should one separate
carriers?
 - 
  How far should one separate antennas for diversity?
 - 
  What is good interleaving depth?
 - 
  What bit rates work well?
 - 
  Why can't I connect an ordinary POTS modem to a cellular
phone?