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Multilevel construction of block and trellis group codes

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2 Author(s)
Garello, R. ; Dipartimento di Elettronica, Politecnico di Torino, Italy ; Benedetto, S.

The theory of group codes has been shown to be a useful starting point for the construction of good geometrically uniform codes. In this paper we study the problem of building multilevel group codes, i.e., codes obtained combining separate coding at different levels in such a way that the resulting code is a group code. A construction leading to multilevel group codes for semi-direct and direct products is illustrated. The codes that can be obtained in this way are identified. New geometrically uniform Euclidean-space codes obtained from multilevel codes over abelian and nonabelian groups are presented

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Information Theory, IEEE Transactions on  (Volume:41 ,  Issue: 5 )