Block decision feedback equalizer

H - Electricity – 04 – L

Patent

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Details

H04L 27/01 (2006.01) H04B 7/08 (2006.01) H04L 25/03 (2006.01)

Patent

CA 2196127

A block decision feedback equalizer uses a Cholesky algorithm to factora channel impulse response correlation matrix in order to solve for data received over a dispersive communications channel. While the Cholesky algorithm increases the computational complexity of the initial data symbol estimate (the result of a linear block estimation), its use allows the use of a recursive update for computing successive data symbols with little additional computation. Further, the Cholesky algorithm is free of limitations that would limit detection to cases where the channel span or memory is smaller than the probe segment following the data block to be detected. Additional functions such as diversity combining, incorporation of a time-varying channel response model and fractional baud-period sampling are provided in the block detector.

L'invention est un égaliseur récursif de blocs de données qui utilise un algorithme de Cholesky pour factoriser une matrice de corrélation de réponses impulsionnelles dans un canal pour recouvrer les données reçues via un canal de communication dispersif. Malgré que l'utilisation d'un algorithme de Cholesky rende les calculs plus complexes dans l'estimation des symboles des données initiales, cet algorithme permet d'utiliser une mise à jour récursive dans le calcul des symboles de données successifs sans compliquer sensiblement les calculs. De plus, l'algorithme de Cholesky est exempt des limitations qui restreindraient la détection aux cas où la largeur du canal ou la capacité de la mémoire est plus petite que le segment d'échantillonnage qui suit le bloc de données à détecter. Le détecteur de blocs comporte d'autres fonctions, telles que la combinaison de diversités, l'incorporation d'un modèle de réponse de canal variant avec le temps et l'échantillonnage fractionnaire.

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