The Viterbi Decoder block yields wrong results when it is fed values of +/- Inf. These values could result from a demodulation block when the SNR is very high. This is because the LLR (log-likelihood ratio) becomes impossible to compute with finite-precision arithmetic.
MATLAB: Does the Viterbi Decoder block give wrong results when it is fed values of +/- Inf in Communication Blockset (R2007b)
blocksetcommunicationscommunications blocksetinfviterbi
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