Interpolation for use in channel estimation

H - Electricity – 04 – J

Patent

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Details

H04J 3/14 (2006.01) H04W 24/00 (2009.01) H04L 5/22 (2006.01) H04L 25/02 (2006.01) H04L 25/17 (2006.01) H04J 13/00 (2006.01)

Patent

CA 2480074

A method for the estimation of the transfer function of a transmission channel in a receiving system of UMTS type envisages the computation of a plurality of channel coefficients, included among known channel coefficients corresponding to pilot symbols, through the reiteration of an interpolation algorithm, capable of calculating an intermediate point (Z, f(Z)) between a first extreme and a second extreme of a determined interval, the first extreme being formed by at least two known points and the second extreme being formed by at least one known point, the intermediate point to be calculated having as abscissa (Z) the abscissa value of the mean point between the points defining the interval rounded off to the integer closest to the first extreme, and having as ordinate (F(Z)) the arithmetic average between the ordinate of the known point of the second extreme and the ordinate of a point, chosen between the two known points of the first extreme, having a distance from the intermediate point equal to the distance between the intermediate point and the known point of the second extreme.

L'invention concerne un procédé d'estimation de la fonction de transfert d'un canal d'émission dans un système de réception de type UMTS consistant à calculer plusieurs coefficients de canal, parmi plusieurs coefficients connus de canal correspondant à des symboles pilote, par réitération d'un algorithme d'interpolation, pouvant calculer un point intermédiaire (Z, f(Z)) entre un premier extrême et un second extrême d'un intervalle déterminé, le premier extrême étant formé d'au moins deux points connus et le second d'au moins un point connu, le point intermédiaire à calculer possédant comme abscisse (Z) la valeur de l'abscisse du point moyen entre les points définissant l'intervalle arrondi à l'entier le plus proche du premier extrême, et possédant comme ordonnée (F(Z)) la moyenne arithmétique entre l'ordonnée du point connu du second extrême et l'ordonnée d'un point, choisi entre les deux points connus du premier extrême, dont la distance au point intermédiaire est égale à la distance entre le point intermédiaire et le point connu du second extrême.

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