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Digital Communication
Systems
Dr. Shurjeel Wyne
Lecture 18
CH 7 - Convolutional Codes
Numerical problems for Convolutional Codes
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Convolutional Codes: Encoder Diagrams and Decoding, Slides of Digital Communication Systems
The concepts of convolutional codes, focusing on drawing state diagrams, tree diagrams, and trellis diagrams for the encoder characterized by the block diagram in figure p7.2. It also includes numerical problems related to convolutional codes, such as drawing encoders, determining if a code is catastrophic, and estimating transmitted message bits using viterbi decoding.
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2011/2012
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Digital Communication
Systems
Dr. Shurjeel Wyne
Lecture 18
CH 7 - Convolutional Codes
Numerical problems for Convolutional Codes
NOTE: Article 7.5 (Sklar, 2e), on the topics of sequential decoding and feedback decoding not included in course.
7.3: Draw the state diagram, tree diagram, and trellis diagram for the convolutional encoder characterized by the block diagram in Figure P7.2.
Problem 2: A convolutional code is described by the sequences: g 1 = [1 0 1] g 2 = [0 1 1]
(a) Draw the encoder
(b) Is the code catastrophic?