Apparatus and method for communicating digital data using...

H - Electricity – 04 – L

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H04L 27/34 (2006.01) H04N 7/015 (2006.01) H04N 5/44 (2006.01)

Patent

CA 2122753

Punctured binary convolutional codes are used in a trellis coded modulation scheme to achieve spectral efficiencies as high as those of multi-dimensional codes, using simple hardware. A base rate 1/2 binary convolutional code is punctured to rate n/k. The output of the punctured encoder is mapped to a four-way partition of a 2N point two-dimensional QAM constellation. The four-way partition consists of a two-way partition in both the I and Q dimensions. The two-way partitions of each dimension are used to transmit the two level output of the rate n/k binary convolutional coder. (N-2) "uncoded" bits are transmitted by selecting the unique constellation point in a partition group. The code has an average throughput of (N-2)+2n/k bits per symbol. The invention is also applicable to trellis coded amplitude modulation schemes based on 2N possible amplitude levels provided along a one-dimensional constellation.

Des codes convolutionnels binaires discontinus sont utilisés dans un schéma de modulation à codage en treillis pour obtenir des rendements spectraux aussi élevés que ceux des codes multidimensionnels, au moyen d'un matériel simple. Un code convolutionnel binaire à débit de base de 1/2 comprend une discontinuité de débit n/k. La sortie du codeur à discontinuité est mise en correspondance avec une quadruple partition d'une constellation QAM bidimensionnelle à 2N points. La quadruple partition consiste en une double partition dans les dimensions I et Q. Les doubles partitions de chaque dimension sont utilisées pour transmettre la sortie à deux niveaux du codeur convolutionnel binaire à débit n/k. (N-2) bits « non codés » sont transmis par sélection de l'unique point de constellation d'un groupe de partition. Le code a un débit moyen de (N-2)+2n/k bits par symbole. L'invention s'applique également à des schémas de modulation d'amplitude à codage en treillis basés sur 2N niveaux d'amplitude possibles associés à une constellation unidimensionnelle.

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