TC Module Credentials
The Turbo Codes module was
developed in collaboration with
Dr. Matthew
Valenti of
West Virginia University and provides support for parallel
concatenated turbo codes, including the UMTS specification.
Additional information is also available at the
Iterative Solutions
web site.
Decoder Implementation
The VisSim/Comm TC decoder is of a
flexible design. It allows the user to select the implementation of
the max* operator computation, and it provides the option of using
dynamic halting.
Since the max* operator constitutes a significant portion of the
overall decoder complexity, its manner of implementation directly
affects the performance and speed of the decoding process. Four
variants of the algorithms are available: log-MAP, max-log-MAP,
constant-log-MAP, and linear-log-MAP.
Because a decoder rarely requires the maximum number of iterations
to converge, using an early stopping criterion will improve
throughput.
The VisSim/Comm TC decoder uses a simple and effective stopping
criteria based on the log-likelihood ratio.
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TC Module Block Listing
The following blocks are included
in the VisSim/Comm TC module:
•
UMTS Interleaver Generator
• S-Random Interleaver Generator
• Generic Turbo Code Encoder (PCCC)
• Generic Turbo Code Decoder (PCCC)
• UMTS Turbo Code Encoder
• UMTS Turbo Code Encoder
To download a fully functional Evaluation version of the software,
complete with a number of TC examples, please visit our
download center.
System Requirements
• VisSim/Comm 6.0 or later
• Win 98/NT/2000/Me/XP
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