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Coset codes. II. Binary lattices and related codes

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1 Author(s)
Forney, G.D., Jr. ; Codex Corp., Canton, MA, USA

For pt.I see ibid., vol.34, no.5, p.1123-51 (1988). The family of Barnes-Wall lattices (including D4 and E 8) of lengths N=2n and their principal sublattices, which are useful in constructing coset codes, are generated by iteration of a simple construction called the squaring construction. The closely related Reed-Muller codes are generated by the same construction. The principal properties of these codes and lattices are consequences of the general properties of iterated squaring constructions, which also exhibit the interrelationships between codes and lattices of different lengths. An extension called the cubing construction generates good codes and lattices of lengths N=3×2n, including the Golay code and Leech lattice, with the use of special bases for 8-space. Another related construction generates the Nordstrom-Robinson code and an analogous 16-dimensional nonlattice packing. These constructions are represented by trellis diagrams that display their structure and interrelationships and that lead to efficient maximum-likelihood decoding algorithms

Published in:

Information Theory, IEEE Transactions on  (Volume:34 ,  Issue: 5 )

Date of Publication:

Sep 1988

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