Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1996-10-24
1999-11-30
Chan, Jason
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
375262, 375265, 371 3706, 371 436, 371 437, 371 434, H04L 2706, H03D 100
Patent
active
059955627
ABSTRACT:
In a maximum-likelihood decoder, a reliability information of decoded data corresponding to a maximum-likelihood path is generated by using state codes previously assigned to the trellis states, respectively. After a survivor path is selected for each of the trellis states according to Viterbi algorithm, the survivor path is stored, and then a maximum-likelihood path is selected from the survivor paths stored. Based on at least two state codes each corresponding to a different trellis state, a reliability value is generated as the reliability information. Since the assigned state codes are used to generate the reliability information, the reliability criterion of decoded data is kept substantially at constant even when the conditions of input signals are changed, resulting in improved reliability of decoded data.
REFERENCES:
patent: 4811346 (1989-03-01), Battail
patent: 4932029 (1990-06-01), Heichler
patent: 5181209 (1993-01-01), Hagenauer et al.
patent: 5537444 (1996-07-01), Nill et al.
Communications Technology for the 1990's and Beyond, Dallas, Nov. 27-30, 1989, vol. 3 of 3, Nov. 27, 1989, Institute of Electrical and Electronics Engineers, pp. 1680-1686, Hagenauer J. et al.: "A Viterbi Algorithm with Soft-Decision Outputs and Its Applications" .
George C. Clark, Jr., "Reliability-of-Decoding Indicators for Maximum Likelihood Decoders", Proceedings of the 5th Hawaii International Conference on System Science, Honolulu, Hawaii, Western Periodicals, US, 1972, pp. 447-450.
Chan Jason
Corrielus Jean B
NEC Corporation
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