This paper describes a class of rate 1 /2 nonsystematic convolutional codes. Theoretical analyses are given to show 1) that with these codes the information sequence is extracted as reliably as possible without decoding for nonsystematic codes and 2) that the constraints imposed to achieve the quicklook-in feature do not significantly limit the error-correcting ability of the codes in the sense that the gilbert bound on minimum distance can still be attained under these constraints. These codes have been adopted for use in several forthcoming space missions.
Nonsystematic convolutional codes for sequential decoding in space applications
IEEE TR. COMMUN. TECHNOLOGY ; COM-19 , 5 ; 806-813
1971
8 Seiten, 2 Bilder, 2 Tabellen, 15 Quellen
Article (Journal)
English
CODIERUNG , FEHLERKORREKTUR , FOLGE , RAUMFAHRT , SYSTEMATIK , ZUVERLAESSIGKEIT , THEORIE
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