Soft decision decoder

Details Soft decision decoder Soft decision decoder

1997-02-10

1999-07-06

Chin, Stephen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375341, 375317, 375316, H03D 100

Patent

active

059205997

ABSTRACT:
A soft decision decoder including an adaptive equalizer and a reliability information generator. The reliability information generator, receiving soft decision data and equalized square error from the adaptive filter, performs delay detection of the soft decision data, and then rotates the phase of the delay detected data so as to match the data to transmitted data components. The rotated data is weighted with the average value of the equalized square error to generate the reliability information for the soft decision Viterbi decoding. This makes it possible to obviate the exponential or logarithm calculations which are conventionally needed for generating the reliability information for carrying out the soft decision Viterbi decoding of the output of the adaptive equalizer, and hence to reduce the enormous amount of calculations and the size of hardware like DSP for performing the calculations.

REFERENCES:
patent: 5361400 (1994-11-01), Kazecki et al.
patent: 5363408 (1994-11-01), Paik et al.
patent: 5636251 (1997-06-01), Citta et al.
A Soft-Output Bidirectional Decision Feedback Equalization Technique for TDMA Cellular Radio, Yow-Jong Liu, et al., IEEE Journal on Selected Areas in Communications, vol. 11, No. 7, Sep. 1993, pp. 1034-1045.

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