Adaptive predistortion system

H - Electricity – 04 – L

Patent

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H04L 25/49 (2006.01) H04L 27/36 (2006.01)

Patent

CA 2274522

A method and apparatus are described for adaptively predistorting a signal before it is transmitted by a transmitter (12, 14, 16, 18) in order to compensate for nonlinearities which are introduced. Statistical information regarding the received signal is accumulated at a receiver (24), and is preferably transmitted back to the transmitter for processing. The processing includes a constellation analysis to determine the distortion characteristics of the signal, which may includes bias, gain imbalance, lock and quad angle errors, and nonlinear distortions including AM-AM and AM-FM conversion effects, with all of these phenomena occurring anywhere in the transmitter- channel-receiver chain. From analysis of the statistics of the distortions in the received signal constellation, adjustments are made in the transmitter and/or receiver parameters. The positions of the signal symbols in the transmitted constellation are thereby correctively predistorted to compensate for and ameliorate the distortions in the received signal, thereby improving the fidelity of the said received signal.

L'invention concerne un procédé et un dispositif de prédistorsion adaptative d'un signal avant son émission par le biais d'un émetteur (12, 14, 16, 18) de manière à compenser les non linéarités qui sont introduites. Les informations statistiques concernant le signal reçu sont accumulées dans un récepteur (24) et sont renvoyées de préférence à l'émetteur en vue d'un traitement. Ledit traitement comprend une analyse de constellation visant à déterminer les caractéristiques de distorsion du signal se référant aux distorsions biaises, au déséquilibre de gain, au verrouillage et erreurs d'angle quadruple et aux distorsions non linéaires dérivées des effets de conversion modulation amplitude/modulation amplitude et modulation amplitude/modulation fréquence. Ces phénomènes sont susceptibles d'apparaître n'importe où dans la chaîne émetteur-voie de communication-récepteur. Les paramètres de l'émetteur et/ou du récepteur sont réglés en fonction des analyses des statistiques de distorsions dans la constellation de signaux reçus. Les positions des symboles de signaux dans la constellation émise subissent une prédistorsion corrective pour compenser et améliorer les distorsions du signal reçu, d'où une optimisation de la fidélité dudit signal reçu.

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