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Short codes with a given covering radius

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3 Author(s)
Brualdi, R.A. ; Dept. of Math., Wisconsin Univ., Madison, WI, USA ; Pless, V.S. ; Wilson, R.

The covering radius r of a code is the maximum distance from any vector in the space containing the code to the nearest codeword. The authors introduce a new function l(m,r), called the length function, which equals the smallest length of a binary code of codimension m and covering radius r. They investigate basic properties of the length function. Projective geometries over larger fields are used to construct families of codes which improve significantly the upper bound for l(m,2) obtained by amalgamation of Hamming codes. General methods are developed for ruling out the existence of codes of covering radius 2 with a given codimension and length resulting in lower bounds for l(m,2). A table is presented which gives the best results now known for l(m,r) with m⩽12 and r⩽12

Published in:

Information Theory, IEEE Transactions on  (Volume:35 ,  Issue: 1 )

Date of Publication:

Jan 1989

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