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Gilles Lachaud

dblp:95/845 · DBLP profile ↗
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4ranked-venue papers
4as first author
0since 2021 · last 1995
—ORCID · none

Domains — the database's venue-derived domains; a paper can count in several

Theory of computation · 4 · 4 first-author

Expertise — from the expertise taxonomy: the topics of the expert's papers under the CCF categories. A weight counts papers with recency: 1 for a paper about the topic, 0.3 when the topic is its context, halved every five years.

Theoretical computer science
2 papers
Coding theory · 100%

Topics — the 7 heaviest of 7, each with the papers that count most for it

TopicWeightPapersLastEvidence papers
Coding theory › sphere packing
kissing number
0.011994
Polynomial-time construction of codes II. Spherical codes and the kissing number of spheres · IEEE Trans. Inf. Theory 1994
Coding theory › signal sets › signal set design
spherical codes
0.011994
Polynomial-time construction of codes II. Spherical codes and the kissing number of spheres · IEEE Trans. Inf. Theory 1994
Coding theory › error-correcting codes
cyclic codes
0.011990
The weights of the orthogonals of the extended quadratic binary Goppa codes · IEEE Trans. Inf. Theory 1990
Coding theory › error-correcting codes › algebraic geometry code
goppa codes
0.011990
The weights of the orthogonals of the extended quadratic binary Goppa codes · IEEE Trans. Inf. Theory 1990
Coding theory › error-correcting codes › algebraic geometry code › goppa codes
melas code
0.011990
The weights of the orthogonals of the extended quadratic binary Goppa codes · IEEE Trans. Inf. Theory 1990
Coding theory › channel coding › error probability bounds
shannon bounds
0.011994
Polynomial-time construction of codes II. Spherical codes and the kissing number of spheres · IEEE Trans. Inf. Theory 1994
Coding theory › error-correcting codes
weight distribution
0.011990
The weights of the orthogonals of the extended quadratic binary Goppa codes · IEEE Trans. Inf. Theory 1990

Methods — techniques the papers use, named apart from their topics

polynomial-time construction · 0.0kloosterman sums · 0.0elliptic curves · 0.0
YearPublicationVenuePosition
1995 Introduction to the special issue on algebraic geometry codes
Gilles Lachaud, Michael A. Tsfasman, Jørn Justesen, Victor K.-W. Wei
IEEE Trans. Inf. Theory1
1994 Polynomial-time construction of codes II. Spherical codes and the kissing number of spheres
abstract
A spherical code is a finite set X of points lying on the unit sphere of R/sup n/. For such a set, we define /spl rho/(X) as the minimum of the squared distances /spl par/x-y/spl par//sup 2/, when x, y/spl isin/X and x/spl ne/y. Define R(/spl rho/)=lim sup n/spl rarr//spl infin/, /spl rho/(X)=p log/sub 2/CardX/n. Chabauty in 1953 and Shannon in 1959 have given a lower bound for R(/spl rho/), namely, R(/spl rho/)>R/sub CS/(/spl rho/)=1-1/3log/sub 2//spl rho/(4-p). The complexity of construction of the spherical codes used in order to get this bound is doubly exponential. The polynomially constructible spherical bound R/sub pol/(/spl rho/) is defined as above with the additional restriction that only families of codes with polynomial complexity of construction are considered. We prove R/sub pol/(/spl rho/)/spl ges/R/sub CS/(/spl rho/)/2, if /spl rho//spl les/1.535. Denote by /spl tau//sub X/(n) the number of spheres of equal radius that touch one sphere in the n-dimensional space given by some explicit family X, that is, a family of arrangements of spheres). The asymptotic polynomially constructible kissing number is /spl theta//sub pol/=lim sup(log/sub 2//spl tau//sub X/(n))/n, when X ranges over all polynomially constructible families. We prove /spl theta//sub pol//spl ges/2/15=0.133/spl middot//spl middot//spl middot/.>
Gilles Lachaud, Jacques Stern
IEEE Trans. Inf. Theory1
1992 Artin-Schreier Curves, Exponential Sums, and Coding Theory
Gilles Lachaud
Theor. Comput. Sci.1
1990 The weights of the orthogonals of the extended quadratic binary Goppa codes
abstract
Starting from results on elliptic curves and Kloosterman sums over the finite field GE(2/sup t/), the authors determine the weights of the orthogonals of some binary linear codes; the Melas code of length, the irreducible cyclic binary code of length 2/sup t/+1, and the extended binary Goppa codes defined by polynomials of degree two.>
Gilles Lachaud, Jacques Wolfmann
IEEE Trans. Inf. Theory1