VisSim/Comm Turbo Codes
Turbo Codes constitute a major development in the field of
Forward Error Correction (FEC).
Exhibiting performance approaching the
Shannon limit, Turbo Codes (TC) have seen rapid adoption in the
design of modern digital communication systems.
The Optional TC module brings the power of Turbo Codes to
VisSim/Comm simulations by adding support for the PCCC variety
of turbo codes.
The
TC blockset features efficient encoder and decoder designs, including
support for the UMTS specification.
Jump-start your FEC system designs
by making VisSim/Comm TC a part of your design cycle!
Visit our download center to obtain a fully
functional Evaluation version of the software, complete with online
documentation and model examples.
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.
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 5.0 or later
- Pentium II 400
- Win 98/NT/2000/Me/XP
- 1 MB disk space
- SVGA monitor or better
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