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On the decoding bit error probability for binary convolutional codes

  • Rolf Johannesson
  • James L. Massey
  • Per Ståhl
Publiceringsår: 2000
Språk: Engelska
Dokumenttyp: Konferensbidrag


An explanation is given for the paradoxical fact that, at low signal-to-noise ratios, the systematic feedback encoder results in fewer decoding bit errors than does a nonsystematic feedforward encoder for the same code. The analysis identifies a new code property, the d-distance weight density of the code. For a given d-distance weight density, the decoding bit error probability depends on the number of taps in the realization of the encoder inverse. Among all encoders for a given convolutional code, the systematic one has the simplest encoder inverse and, hence, gives the smallest bit error probability



  • Electrical Engineering, Electronic Engineering, Information Engineering


2000 International Symposium on Information Theory
Sorrento, Italy
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  • ISBN: 0-7803-5857-0

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