Self-adjusting modulator

Details Self-adjusting modulator Self-adjusting modulator

H - Electricity

03

C

H03C 3/08 (2006.01)

Patent

CA 2168887

A self-adjusting quadrature modulator and modulation method improve the accuracy with which digital data is impressed on an RF carrier, which is particularly useful for systems having Viterbi, echo-integrating demodulatorsand for systems using subtractive CDMA techniques. The method and apparatus involve receiving one's own transmission with a suitable modulation assessment receiver and determining the modulation error relative to the theoretically perfect transmission expected by the receiver. The measured error is used to adjust the modulation to minimize the error. The modulation assessment receiver may use log-polar signal processing to measure phase and (log)amplitude instead of cartesian I and Q components, and then convert to cartesian form. In addition, correction factors determined by the modulation assessment receiver can be directly identified with certain transform components produced by the Fast WalshTransform.

Procédé et appareil (118) permettant de recevoir ses propres émissions à l'aide d'un récepteur adapté d'évaluation de la modulation approprié (119-125) et de déterminer (125) l'erreur de modulation par rapport à la modulation théoriquement parfaite supposée être reçue par le récepteur. L'erreur mesurée sert à régler (110) la modulation pour réduire l'erreur. Le récepteur d'évaluation de la modulation peut utiliser un traitement des signaux du type logarithme-polaire (122) pour mesurer la phase et le logarithme de l'amplitude (123) au lieu des composantes cartésiennes I et Q, puis effectuer une conversion (125) sous forme cartésienne.

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