DocumentCode
1355846
Title
A note on type II convolutional codes
Author
Johannesson, Rolf ; Ståhl, Per ; Wittenmark, Emma
Author_Institution
Dept. of Inf. Theory, Lund Univ., Sweden
Volume
46
Issue
4
fYear
2000
fDate
7/1/2000 12:00:00 AM
Firstpage
1510
Lastpage
1514
Abstract
The result of a search for the world´s second type II (doubly-even and self-dual) convolutional code is reported. A rate R=4/8, 16-state, time-invariant, convolutional code with free distance dfree=8 was found to be type II. The initial part of its weight spectrum is better than that of the Golay convolutional code (GCC). Generator matrices and path weight enumerators for some other type II convolutional codes are given. By the “wrap-around” technique tail-biting versions of (32, 18, 8) Type II block codes are constructed
Keywords
binary codes; block codes; convolutional codes; dual codes; matrix algebra; Golay convolutional code; binary codes; doubly-even convolutional code; free distance; generator matrices; path weight enumerators; self-dual convolutional code; tail-biting type II block codes; time-invariant convolutional code; type II convolutional codes; wrap-around technique; Block codes; Convolutional codes; Councils; Delay; Information technology; Information theory; Mobile communication;
fLanguage
English
Journal_Title
Information Theory, IEEE Transactions on
Publisher
ieee
ISSN
0018-9448
Type
jour
DOI
10.1109/18.850684
Filename
850684
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