PPT Slide
Convolutional coding became famous in the 80’s with Viterbi decoding
S0
S1
S3
S2
S5
S4
+
+
input data
coded output 1
coded output 2
g0(x) = 1 + x2 + x3 + x5 +x6
g1(x) = 1 + x1 + x2 + x3 +x6
S0 S1 S2 S3 S4 S5
64 encoder states
000000 , 010100, etc.
Example : K=7, k/n = 1/2, non-recursive, non-systematic
linear feedback
shift-register
(LFSR)
constraint length
code rate
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