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Optical Fiber Telecommunications VA, 5th Edition
book

Optical Fiber Telecommunications VA, 5th Edition

by Ivan Kaminow, Alan E. Willner, Tingye Li
July 2010
Intermediate to advanced content levelIntermediate to advanced
944 pages
34h 12m
English
Academic Press
Content preview from Optical Fiber Telecommunications VA, 5th Edition
X
K
k = 0
jy
k
~
s
k
j
2
with
~
s
k
=
X
k
j = kL
d
kj
~
a
j
; (18.7)
among all trial sequences f
~
a
j
g
K
j = 0
for sufficiently large K. The complexity of
Viterbi algorithm is proportional to 2
L
. Note that the squared Euclidean distance
is proportional to the log-likelihood for Gaussian noise. A more general expression
of the metric optimized by MLSE is given in Eqn (18.41).
The performance of MLSE cannot exceed the matched filter bound given by
Refs [16, 17]
Q
2
ðMFÞ=
a
2
N
0
Z
þ1
1
Mðf Þdf ; (18.8)
which is the maximum SNR for detecting a single isolated pulse among noise.
Although MLSE outperforms DFE, it is still difficult to equalize a channel that has
spectral nulls or cutoff
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Publisher Resources

ISBN: 9780123741714