Adaptive pre-distortion apparatus for linearizing an...

H - Electricity – 04 – B

Patent

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H04B 1/62 (2006.01) H03F 1/32 (2006.01) H04L 27/36 (2006.01)

Patent

CA 2241010

An adaptive apparatus for compensating the non-linear distorting action of an amplifier in a transmission system. I-channel and Q-channel memories store a plurality of digital pre-distortion correction values. The memories are addressed using a predetermined number of significant bits of an incoming, original information signal to retrieve I-channel and Q-channel pre-distortion correction values. The I-channel and Q-channel pre-distortion correction values are combined, digitally, with I-channel and Q-channel components of the original information signal to pre-distort the original information signal. The pre-distorted signal, in real format, is supplied to the amplifier, and a feed-back sample signal is coupled-off of the output of the amplifier. A comparison is made between the original information signal and the feed-back sample signal in digital format and in the complex domain (I/Q).

L'invention est un appareil de correction des distorsions non linéaires engendrées par un amplificateur dans un système de transmission. Des mémoires de canal I et de canal Q contiennent une pluralité de valeurs numériques de correction par prédistorsion. Ces mémoires sont accessibles au moyen d'un nombre prédéterminé de bits significatifs dans un signal d'information incident et fournissent les valeurs de correction par prédistorsion pour les canaux I et Q. Ces valeurs sont combinées numériquement avec les composantes du signal d'information originel dans les canaux I et Q pour produire une prédistorsion dans ce signal d'information. Le signal prédistordu est fourni à l'amplificateur en format réel et un signal de rétroaction est prélevé à la sortie de l'amplificateur. Une comparaison est effectuée entre le signal d'information originel et le signal de rétroaction en format numérique et dans le domaine complexe (I/Q).

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