Pulse or digital communications – Repeaters – Testing
Patent
1990-04-11
1992-06-02
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
371 43, 375 13, 375101, H04B 304
Patent
active
051194007
ABSTRACT:
In a digital transmission system having a dispersive transmission channel, so-called Soft Decision Decoding of the data elements is carried out utilizing reliability information which is a probability function indicating with what probability the data elements correspond with the transmitted data elements. This reliability information is generated by means of Viterbi-like equalizer in that respectively from first and second mutually exclusive sets of all possible paths along transitions between multibit states, corresponding to sequential bit values, the first set characterized by the n last bit value being binary "zero" and the second set characterized by the n last bit value being binary "one", the paths having the smallest probability function are selected and the reliability information is produced from the ratio between the probability functions of the paths selected from the respective sets.
REFERENCES:
patent: 4456992 (1984-06-01), Schaub
patent: 4823346 (1989-04-01), Kobayashi
patent: 4914660 (1990-04-01), Hirose
G. D. Forney, Jr., "The Viterbi Algorithm", Proceedings of the IEEE, vol. 61, No. 3, Mar. 1973, pp. 268-278.
Safourek Benedict V.
Treacy David R.
U. S. Philips Corporation
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