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Problems 33
1–17 Using the definitions for terms associated with convolutional coding, draw a block diagram for a
convolutional coder that has rate R = 2 and constraint length K = 3.
3
★ 1–18 For the convolutional encoder shown in Fig. P1–18, compute the output coded data when the
input data is x = [10111]. (The first input bit is the leftmost element of the x row vector.)
Data x
Input
Three-stage shift register
S 1 S 2 S 3
Modulo 2 adders
Commutator
Figure P1–18
Convolutional code
Output