Decoding error correcting codes transmitted through multiple wire twisted pair cables with uneven noise on the wires

Decoding error correcting codes transmitted through multiple wire twisted pair cables with uneven noise on the wires

  • CN 1,770,674 B
  • Filed: 09/27/2005
  • Issued: 12/12/2012
  • Est. Priority Date: 09/28/2004
  • Status: Active Grant
First Claim
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1. the metric maker at the communications receiving equipment internal implementation is characterized in that, comprising:

  • Input is used for;

    Receive the first centrifugal pump modulation symbol, this symbol is corresponding to first signal path with first signal to noise ratio;

    Receive the second centrifugal pump modulation symbol, this symbol is corresponding to the secondary signal path with second signal to noise ratio;

    Metric computing function property module is used for;

    Use amplification factor, the said first signal path noise variance and the said first signal path criteria for noise deviation to calculate the first symbol metric corresponding to the said first centrifugal pump modulation symbol with first signal to noise ratio with first signal to noise ratio;

    Use said amplification factor, said secondary signal approach noise variance and said secondary signal approach noise standard deviation to calculate the second symbol metric corresponding to the said second centrifugal pump modulation symbol with second signal to noise ratio with second signal to noise ratio;

    Said amplification factor is carried out accommodation according to the variation of condition;

    Output is used for providing to error-correcting code decoder each symbol metric of said calculating;

    The said first symbol metric is first and second '"'"'s a product;

    Said first formula is;

    Wherein, σ

    aIt is the first signal path criteria for noise deviation with first signal to noise ratio;

    Said second is exponential quantity, and its formula is;

    Wherein, σ

    a2Be the first signal path noise variance with first signal to noise ratio, a is said amplification factor;

    The said second symbol metric adopts and the identical account form of the first symbol metric, wherein, and σ

    aBe secondary signal approach noise standard deviation with second signal to noise ratio, σ

    a2Be the secondary signal approach noise variance with second signal to noise ratio, a is an amplification factor;

    Said D SE(y, s) be transmit y and receive Euclidean distance between the signal s square.

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