Contraction (with Expurgated Narrow-Sense BCH-Code)

Let C(A) denote a cyclic [s, n, d]-code over Fb and u ≥ 2 an integer such that u | b−1, u | s, and all elements of B := – (ℤs ∖ Aʹ) have the same remainder mod u. Then d must be a multiple of u and the projection of C(A) on its first s/u coordinates is a constacyclic [s/u, n, d /u]-code, the so called contraction of C(A).

See Also


[1]Jürgen Bierbrauer.
Introduction to Coding Theory.
Discrete Mathematics and its Applications. Chapman & Hall/CRC, Boca Raton, London, New York, Washington D.C., 2004.
MR2079734 (2005f:94001)


Copyright © 2004, 2005, 2006, 2007, 2008, 2009, 2010 by Rudolf Schürer and Wolfgang Ch. Schmid.
Cite this as: Rudolf Schürer and Wolfgang Ch. Schmid. “Contraction (with Expurgated Narrow-Sense BCH-Code).” From MinT—the database of optimal net, code, OA, and OOA parameters. Version: 2015-09-03.

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