Order recursive lattice decision feedback equalization for...

H - Electricity – 04 – J

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H04J 3/04 (2006.01) H03K 5/159 (2006.01) H04B 7/212 (2006.01) H04J 3/14 (2006.01) H04L 25/03 (2006.01)

Patent

CA 2076121

A received time division multiple access (TDMA) signal having a time slot comprised of a plurality of symbols including at least one sequence of synchronizing symbols and a plurality of data symbols is demodulated by adaptively filtering the received signal to minimize inter-symbol interference due to an effect of channel signal propagation delay. The adaptive filtering step is performed by processing the received signal with a multi-stage lattice decision feedback equalizer having (M = N1 - N2) stages followed by (N2 - 1) two-dimensional stages. A metric is next formed for each of the stages in accordance with a predetermined mathematical relationship between the output signals of each of two stages. A plurality of the formed metrics are next accumulated over a plurality of time slots. A number of stages are then recursively determined for the lattice decision feedback equalizer for use during the next time slot by comparing, to a threshold value, the difference between the values of two accumulated metrics.

Un signal de système à accès multiple à multiplexage temporel (AMRT) reçu comportant un créneau temporel constitué d'une pluralité de symboles incluant au moins une suite de symboles de synchronisation et une pluralité de symboles de données est démodulé par filtrage adaptatif pour minimiser le parasitage intersymbole dû au retard de propagation du signal dans le canal. Ce filtrage adaptatif se fait en traitant le signal reçu au moyen d'un égaliseur récursif comportant M = N1 - N2 étages suivis de N2 - 1 étages bidimensionnels. Une mesure est ensuite effectuée pour chacun des étages selon une relation mathématique prédéterminée entre les signaux de sortie de chaque paire d'étages. Plusieurs des mesures sont ensuite totalisées pour une pluralité de créneaux temporels. Plusieurs étages sont ensuite choisis de façon récursive pour être mis à la disposition de l'égaliseur récursif durant le créneau temporel suivant en comparant à un seuil donné la différence entre deux mesures totalisées.

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