ForwardForward
and the mean fade duration 
under
the following conditions:
 |
(9-33) |
 . |
(9-34) |
Step 1: Evaluate 
and m(P).
Substitute P given by (9-33) into (9-31)
and evaluate
and m(P). We obtain
 . |
(9-35) |
Step 2: Evaluate the upper and lower bounds of the –10 dB spectral
bandwidth f-10.
Substituting coefficients of Table
9-3 into (9-32) for 
given in (9-34), we obtain
 . |
(9-36) |
Step 3: Evaluate the mean fade occurrence interval at P=50%.
Substituting (9-36) into (9-30),
we obtain
 , |
(9-37) |
where the subscripts U, L denote the upper and lower bounds of f-10 in (9-36), respectively.
Step 4: Evaluate 
at the upper and lower bound of f-10.
Substituting 
given in (9-37) and m(P) given in (9-35) into (9-28),
 . |
(9-38) |
Step 5: Evaluate 
at the upper and lower bounds of f-10.
Substituting (9-33) and (9-38) into (9-29),
 . |
(9-39) |
In Figure 9-12 through
Figure
9-14 are given pairs of curves showing the spread of the mean fade
occurrence interval
versus elevation angle at the aforementioned maritime bounds for exceedance
probabilities of multipath fading P of 99%, 95%, and 90%, respectively.
In Figure 9-15 through Figure
9-17 are given analogous sets of curves for the mean fade durations .
Consistent with the fact that higher exceedance percentages imply greater
multipath fading, the spread (difference between upper and lower bound
values for a fixed elevation angle) of the mean fade occurrence interval
is greater at the higher percentages (larger fades) and smaller at the
lower percentages (smaller fades). Analogously, the mean fade duration
spread is smaller at the higher percentages (greater fading) and larger
at the smaller percentages (smaller fading).
Figure 9-12: Bounds of mean fade occurrence interval
for multipath fade exceedance percentage P = 99% at L-Band.
Figure 9-13: Bounds of mean fade occurrence interval
for multipath fade exceedance percentage P = 95% at L-Band.
Figure 9-14: Bounds of mean fade occurrence interval
for multipath fade exceedance percentage P = 90% at L-Band.
Figure 9-15: Bounds of mean fade duration
for multipath fade exceedance percentage P = 99% at L-Band.
Figure 9-16: Bounds of mean fade duration
for multipath fade exceedance percentage P = 95% at L-Band.
Figure 9-17: Bounds of mean fade duration
for multipath fade exceedance percentage P = 90% at L-Band.
