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  2. Convolutional code - Wikipedia

    en.wikipedia.org/wiki/Convolutional_code

    The code rate of a convolutional code is commonly modified via symbol puncturing. For example, a convolutional code with a 'mother' code rate / = / may be punctured to a higher rate of, for example, / simply by not transmitting a portion of code symbols. The performance of a punctured convolutional code generally scales well with the amount of ...

  3. Burst error-correcting code - Wikipedia

    en.wikipedia.org/wiki/Burst_error-correcting_code

    Input for the encoder consists of input frames each of 24 8-bit symbols (12 16-bit samples from the A/D converter, 6 each from left and right data (sound) sources). A frame can be represented by L 1 R 1 L 2 R 2 …

  4. Serial concatenated convolutional codes - Wikipedia

    en.wikipedia.org/wiki/Serial_concatenated...

    Fig 1 is an example of a SCCC. Fig. 1. SCCC Encoder. The example encoder is composed of a 16-state outer convolutional code and a 2-state inner convolutional code linked by an interleaver. The natural code rate of the configuration shown is 1/4, however, the inner and/or outer codes may be punctured to achieve higher code rates as needed.

  5. Viterbi decoder - Wikipedia

    en.wikipedia.org/wiki/Viterbi_decoder

    The squared norm distance between the received and the actual symbols in the code alphabet may be further simplified into a linear sum/difference form, which makes it less computationally intensive. Consider a 1/2 convolutional code, which generates 2 bits (00, 01, 10 or 11) for every input bit (1 or 0).

  6. Error correction code - Wikipedia

    en.wikipedia.org/wiki/Error_correction_code

    A convolutional code that is terminated is also a 'block code' in that it encodes a block of input data, but the block size of a convolutional code is generally arbitrary, while block codes have a fixed size dictated by their algebraic characteristics. Types of termination for convolutional codes include "tail-biting" and "bit-flushing".

  7. Concatenated error correction code - Wikipedia

    en.wikipedia.org/wiki/Concatenated_error...

    Turbo codes, as described first in 1993, implemented a parallel concatenation of two convolutional codes, with an interleaver between the two codes and an iterative decoder that passes information forth and back between the codes. [6] This design has a better performance than any previously conceived concatenated codes.

  8. BCJR algorithm - Wikipedia

    en.wikipedia.org/wiki/BCJR_algorithm

    Compute smoothed probabilities based on other information (i.e. noise variance for AWGN, bit crossover probability for binary symmetric channel) Variations [ edit ]

  9. File:Convolutional codes PSK QAM LLR.svg - Wikipedia

    en.wikipedia.org/wiki/File:Convolutional_codes...

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