A note on Type II covolutional codes

Rolf Johannesson; Per Ståhl; Emma Wittenmark

doi:10.1109/18.850684

A note on Type II covolutional codes

Rolf Johannesson, Per Ståhl, Emma Wittenmark

Department of Electrical and Information Technology

Research output: Contribution to journal › Letter › peer-review

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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

Original language	English
Pages (from-to)	1510-1514
Journal	IEEE Transactions on Information Theory
Volume	46
DOIs	https://doi.org/10.1109/18.850684
Publication status	Published - 2000

Subject classification (UKÄ)

Electrical Engineering, Electronic Engineering, Information Engineering

Access to Document

10.1109/18.850684

note00850684

http://ieeexplore.ieee.org/iel5/18/18482/00850684.pdf

Cite this

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title = "A note on Type II covolutional codes",

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",

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AB - 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

U2 - 10.1109/18.850684

DO - 10.1109/18.850684

M3 - Letter

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JO - IEEE Transactions on Information Theory

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