H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 27/26 (2006.01) H03H 17/04 (2006.01) H03H 17/06 (2006.01)
Patent
CA 2657091
The present invention relates to an apparatus (100) for reducing peak power in a transmitter for use in telecommunications systems. The invention also relates to a method for reducing peak power in a transmitter for use in telecommunications system and to a base station (500) including such an apparatus. An apparatus according to the invention includes successive processing stages (10); where each stage (10) has an input main signal (1). Each stage of said apparatus further includes a peak finder means (11) arranged to find at least one peak of said input main signal (1) based on a predetermined threshold level; a manipulation means (12) arranged to generate a scaled, rotated and shifted kernel signal (2) based on information on at least one peak of said input main signal (1); a combiner (13) arranged to subtract the scaled rotated and shifted kernel signal (2) from a delayed version of the input signal (1) generating thereof an output signal (4) having reduced peak or peaks; and said apparatus further characterized in that it comprises a fractional sample shifting means (20) arranged to apply a sample shifting on the output signal (4) from at least one of said successive processing stages (10).
L'invention porte: sur un appareil d'écrêtage (100) des pics de puissance dans un émetteur de systèmes de télécommunications; sur un procédé d'écrêtage (100) des pics de puissance dans un émetteur de systèmes de télécommunications, et sur une station de base (500) comprenant un tel appareil. Ledit appareil comporte plusieurs étages (10) successifs de traitement recevant chacun un signal principal d'entrée (1). Chacun de ces étages comporte: un détecteur de pics (11) détectant au moins un pic du signal principal d'entrée (1) sur la base d'un niveau seuil prédéterminé; un moyen de manipulation (12) créant un signal (2) central scalé, déphasé et décalé sur la base d'informations sur au moins l'un des pics du signal principal d'entrée (1); un combinateur (13) soustrayant le signal (2) d'une version retardée du signal d'entrée (1) et en tirant un signal de sortie (4) présentant un ou des pics écrêtés. L'appareil comporte en outre un moyen de décalage (20) d'un échantillon fractionnel décalant le signal de sortie (4) d'au moins un des étages successifs (10) du traitement.
Hellberg Richard
Widhe Torbjorn
Ericsson Canada Patent Group
Telefonaktiebolaget L. M. Ericsson (publ)
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