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Viterbi decoder (tail-biting)
The Commsonic CMS0008 Viterbi Decoder core implements Viterbi’s algorithm for maximum likelihood decoding of non-feedback convolutional codes.
The basic 1/2 rate convolutional encoder and decoder are shown above. For each input bit, two encoded bits are produced. The rate can be increased to 2/3, 3/4, 5/6, or 7/8 by nontransmission (puncture) of certain bits. Punctured codes lose coding gain as the redundant content decreases.
The encoded X and Y bits are transmitted through a noisy channel. The received X and Y values are measured then presented as soft decision values to the decoder.
The basic 1/2 rate convolutional encoder and decoder are shown above. For each input bit, two encoded bits are produced. The rate can be increased to 2/3, 3/4, 5/6, or 7/8 by nontransmission (puncture) of certain bits. Punctured codes lose coding gain as the redundant content decreases.
The encoded X and Y bits are transmitted through a noisy channel. The received X and Y values are measured then presented as soft decision values to the decoder.
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