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Averaging bounds for lattices and linear codes

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1 Author(s)
Loeliger, H.-A. ; Endora Tech AG, Basel, Switzerland

General random coding theorems for lattices are derived from the Minkowski-Hlawka theorem and their close relation to standard averaging arguments for linear codes over finite fields is pointed out. A new version of the Minkowski-Hlawka theorem itself is obtained as the limit, for p→∞, of a simple lemma for linear codes over GF(p) used with p-level amplitude modulation. The relation between the combinatorial packing of solid bodies and the information-theoretic “soft packing” with arbitrarily small, but positive, overlap is illuminated. The “soft-packing” results are new. When specialized to the additive white Gaussian noise channel, they reduce to (a version of) the de Buda-Poltyrev result that spherically shaped lattice codes and a decoder that is unaware of the shaping can achieve the rate 1/2 log2 (P/N)

Published in:

Information Theory, IEEE Transactions on  (Volume:43 ,  Issue: 6 )

Date of Publication:

Nov 1997

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