Title :
Probability density functions of soft information
Author :
Reggiani, Luca ; Tartara, Guido
Author_Institution :
Dipt. di Elettronica e Inf., Politecnico di Milano, Italy
Abstract :
It is well known that soft decoding algorithms are based on the use of reliability measures for binary and nonbinary symbols. We consider an analytical estimation of the distributions of reliability measures after soft decoding of block and convolutional codes or intersymbol interference (ISI) channels. This estimation, based on a simple geometric interpretation of reliability measures, allows the observation of different distributions for correct and incorrect symbols, and could be helpful for the analysis of soft decoding algorithms.
Keywords :
block codes; convolutional codes; decoding; intersymbol interference; probability; reliability; ISI channels; analytical estimation; binary symbols; block codes; convolutional codes; correct symbols; geometric interpretation; incorrect symbols; input error event; intersymbol interference; nonbinary symbols; output error event; probability density functions; reliability measures distribution; soft decoding algorithms; soft information; Algorithm design and analysis; Concatenated codes; Convolutional codes; Density measurement; Event detection; Information analysis; Interference constraints; Intersymbol interference; Linear systems; Maximum likelihood decoding;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/4234.984688
