Adaptive thresholding algorithm for the noise due to unknown...

H - Electricity – 04 – L

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H04L 25/02 (2006.01)

Patent

CA 2471626

An impulse response is estimated for a channel by estimating an intermediate impulse response of the channel. The intermediate impulse response comprises at least one multipath spike and one or more non-deterministic noise components at locations throughout the channel. Then, a threshold function is applied to the estimated intermediate impulse response across at least a portion of the channel in order to provide an estimated final impulse response of the channel. The threshold function has the effect of nulling the noise components of the channel having values less than the threshold function at the location within the channel of the respective noise component, and the threshold function is characterized by a level that varies across the portion of the channel from a minimum value to a maximum value in a manner determined by the location of the at least one multipath spike within the channel.

L'estimation d'une réponse impulsionnelle intermédiaire d'un canal permet d'estimer la réponse impulsionnelle de ce même canal. La réponse impulsionnelle intermédiaire présente au moins une pointe de trajets multiples et une ou plusieurs composantes de bruit non déterministiques à certains endroits du canal. Une fonction de seuil est ensuite appliquée à la réponse impulsionnelle intermédiaire estimée sur au moins une partie du canal pour obtenir une réponse impulsionnelle finale estimée du canal. La fonction de seuil a pour effet d'annuler les composantes de bruit du canal dont les valeurs sont inférieures à la fonction de seuil à l'endroit du canal où se trouve la composante de bruit respective. La fonction de seuil étant caractérisée par un niveau qui varie, le long de la partie du canal, entre une valeur minimale et une valeur maximale selon l'endroit ou se trouve la pointe des trajets multiples dans le canal.

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