For a linear code over GF (q) we consider two kinds of ''subcodes'' called residuals and punctures. When does the collection of residuals or punctures determine the isomorphism class of the code? We call such a code residually or puncture reconstructible. We investigate these notions of reconstructi
On the Extendability of Linear Codes
โ Scribed by Tatsuya Maruta
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 237 KB
- Volume
- 7
- Category
- Article
- ISSN
- 1071-5797
No coin nor oath required. For personal study only.
โฆ Synopsis
Symposium on Inform. Theory, Whistler, Canada,'' pp. 345)
proved that every [n, k, d] O code with gcd(d, q)"1 and with all weights congruent to 0 or d (modulo q) is extendable to an
O code with all weights congruent to 0 or d#1 (modulo q). We give another elementary geometrical proof of this theorem, which also yields the uniqueness of the extension.
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Classical Goppa codes are a special case of Alternant codes. First we prove that the parity-check subcodes of Goppa codes and the extended Goppa codes are both Alternant codes. Before this paper, all known cyclic Goppa codes were some particular BCH codes. Many families of Goppa codes with a cyclic
Necessary and sufficient conditions for the extendability of residual designs of Steiner systems S ( t , t + 1, v) are studied. In particular, it is shown that a residual design with respect to a single point is uniquely extendable, and the extendability of a residual design with respect to a pair o