Exponential power delay/decay channel

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If I want my channel gain to resemble an exponential power delay profile is it enough to define:
h= [1 0.66]
if I have two channel taps (i.e memory length of 2) and
h= [1 0.66 0.44]
for three taps? or is it more complicated than that?
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I found this vector
[1 0.66 0.44 0.29 0.13 0.05]
when googling "exponential power delay profile" source: http://www.mathworks.com/matlabcentral/newsreader/view_thread/67532
I am trying to simulate an optical channel (wireless).. so h must be real and deterministic (not random)

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