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Precoding and Bandlimited Signals
Precoding
The data symbols are manipulated such that
y
k
k T =
a
k
u 0 + ISI + ν k T
y
k
k
T
a
k
u
0
ISI
ν
k
T
Design of Bandlimited Modulation Signals
Recall that modulation signals are
X
t
= ∑ n = - ∞ ∞
a
n
s t - n T
X
t
n
a
n
s
t
n
T
s t
s
t
u n T = large if n = 0 zero or small if n ≠ 0
u
n
T
large
n
0
zero or small
n
0
y k T =
a
k
u 0 + ∑ n = - ∞ ∞
a
n
u k T - n T + ν k T
y
k
T
a
k
u
0
n
a
n
u
k
T
n
T
ν
k
T
n ≠ k
n
k
y n T = s ¯ g ¯
h
opt
n T
y
n
T
s
g
h
opt
n
T
s t
s
t
Design Equalizers at the Receiver
Linear equalizers or decision feedback equalizers reduce ISI
in the statistic
y
t
y
t
Maximum Likelihood Sequence Detection
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This work is licensed by Tuan Do-Hong. See the Creative Commons License about permission to reuse this material.
Last edited by Tuan Do-Hong on Nov 17, 2007 12:06 am US/Central.