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Small weight codewords of projective geometric codes II

  • Sam Adriaensen,
  • Lins Denaux

摘要

The \(p\) p -ary linear code \(\mathcal {C}_{k}\!\left( n,q\right) \) C k n , q is defined as the row space of the incidence matrix \(A\) A of \(k\) k -spaces and points of \(\textrm{PG}\!\left( n,q\right) \) PG n , q . It is known that if \(q\) q is square, a codeword of weight \(q^k\sqrt{q}+\mathcal {O}\!\left( q^{k-1}\right) \) q k q + O q k - 1 exists that cannot be written as a linear combination of at most \(\sqrt{q}\) q rows of \(A\) A . Over the past few decades, researchers have put a lot of effort towards proving that any codeword of smaller weight does meet this property. We show that if \(q\geqslant 32\) q 32 is a composite prime power, every codeword of \(\mathcal {C}_{k}\!\left( n,q\right) \) C k n , q up to weight \(\mathcal {O}\!\left( q^k\sqrt{q}\right) \) O q k q is a linear combination of at most \(\sqrt{q}\) q rows of \(A\) A . We also generalise this result to the codes \(\mathcal {C}_{j,k}\!\left( n,q\right) \) C j , k n , q , which are defined as the \(p\) p -ary row span of the incidence matrix of k-spaces and j-spaces, \(j < k\) j < k .