Title :
Producing soft-decision information at the output of a class IV partial response Viterbi detector
Author :
Knudson, Kelly J. ; Wolf, Jack K. ; Milstein, Laurence B.
Author_Institution :
Center for Magnetic Recording Res., California Univ., San Diego, La Jolla, CA, USA
Abstract :
A method is described for producing soft-decision information at the output of a Class-IV partial response maximum-likelihood (PRML) detector, when the additive noise samples are independent, Gaussian random variables. This method directly applies the soft-decision Viterbi algorithm, presented by J. Hagenauer and P. Hoeher (1989), to the Class-IV partial response channel. The PRML detector is augmented to produce a reliability value for each binary symbol in the maximum-likelihood (ML) sequence estimate of the binary input. The reliability value is a function of the estimated probability of error for the binary symbol. The soft-decisions are used to enhance the performance of an outer error correction code
Keywords :
error correction codes; signal detection; telecommunication channels; Class-IV partial response channel; Gaussian random variables; Viterbi algorithm; Viterbi detector; additive noise samples; binary input; binary symbol; error probability; independent variables; maximum likelihood sequence estimate; outer error correction code; partial response maximum likelihood detector; reliability value; soft-decision information; Additive noise; Detectors; Error probability; Magnetic recording; Maximum likelihood detection; Maximum likelihood estimation; Partial response channels; Polynomials; Random variables; Viterbi algorithm;
Conference_Titel :
Communications, 1991. ICC '91, Conference Record. IEEE International Conference on
Conference_Location :
Denver, CO
Print_ISBN :
0-7803-0006-8
DOI :
10.1109/ICC.1991.162473
