Closed-loop receiver feedback pre-distortion

Details Closed-loop receiver feedback pre-distortion Closed-loop receiver feedback pre-distortion

H - Electricity

04

L

H04L 7/00 (2006.01)

Patent

CA 2625814

Methods and systems for calculating pre-distortion coefficients in a closed- loop communication system are presented. Transmission terminals that include high power amplifiers are difficult to operate at or near the saturation point without transmitting signals with nonlinear distortions. By pre-distorting the signal prior to amplification the transmitted nonlinear distortions may be decreased. A closed-looped pre-distortion system may include a receiver that calculates the pre-distortion coefficients and transmits these coefficients back to the transmitter. These coefficients may be stored in a pre-distortion coefficient lookup table and may be updated by the receiver terminal.

L'invention concerne des procédés et des systèmes permettant de calculer des coefficients de prédistorsion dans un système de communication en circuit fermé. Les terminaux de transmission comprenant des amplificateurs de grande puissance sont difficiles à utiliser au niveau ou à proximité du point de saturation sans transmettre des signaux avec des distorsions non linéaires. Si l'on applique une prédistorsion au signal avant son amplification, les distorsions non linéaires transmises peuvent être réduites. L'invention concerne un système de prédistorsion en circuit fermé comprenant un récepteur conçu pour calculer les coefficients de prédistorsion et pour transmettre ces coefficients à l'émetteur. Ces coefficients peuvent être stockées dans une table de recherche de coefficient de prédistorsion et mis à jour par le terminal récepteur.

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