Cryptography Reference
In-Depth Information
Figure 7.21 - Performance of simple binary (
m
=1
) and double-binary (
m
=2
)
convolutional codes, for
R
=2
/
3
and
R
=6
/
7
.
it is based. Ultimately, a trellis reduced to a single step and therefore
containing all the possible codewords is equivalent to an ML decoder.
8-state double-binary turbo code
Figure 7.22(a) gives some examples of performance obtained with the turbo code
of [7.2], for a rate 2/3. The parameters of the constituent encoders are:
⎡
⎤
⎡
⎤
⎡
⎤
101
100
010
11
01
01
1
1
0
⎣
⎦
,
C
=
⎣
⎦
,
R
=
⎣
⎦
G
=
The permutation function uses both inter- and intrasymbol interference.
In
particular, we can observe:
