Method and apparatus for automatic gain control of a...

Details Method and apparatus for automatic gain control of a... Method and apparatus for automatic gain control of a...

H - Electricity

04

L

H04L 5/06 (2006.01) H03G 3/30 (2006.01) H03M 1/18 (2006.01) H04L 27/00 (2006.01) H04L 27/28 (2006.01)

Patent

CA 2514884

A receiver operates to AGC a multi-carrier signal through a corresponding number of inner loops and an outer loop AGC processes. A first number of bits for representing the multi-carrier signal with a limited amount of interference is determined through a calibration mode process. The first number of bits provides for quantization of the multi-carrier signal at an outer loop AGC to a maximum quantization level. After the received signal power estimate is reached a predetermined "ON" threshold, the outer loop AGC is operated at a second number of bits higher than the first number of bits to allow a quantization of possible interference in accordance with a difference of the first and second number of bits. The outer loop AGC switches back to use the first number of bits when the received signal power estimate falls below a predetermined "OFF" threshold.

L'invention concerne un récepteur envoyant un signal multiporteuse à AGC au moyen d'un nombre correspondant de boucles internes et de processus AGC à boucle externe. Un premier nombre de bits représentant le signal multiporteuse avec une quantité limitée d'interférences est déterminé par un processus en mode de calibrage. Le premier nombre de bits assure la quantification du signal multiporteuse au niveau d'AGC à boucle externe à un niveau de quantification maximal. Après l'estimation de la puissance du signal reçu, l'AGC en boucle externe se met en marche pour un second nombre de bits supérieur au premier nombre de bits afin de permettre la quantification d'une interférence possible d'après la différence existant entre les premier et second nombres de bits. L'AGC en boucle externe revient à l'utilisation du premier nombre de bits lorsque l'estimation de puissance du signal reçu se trouve dans un seuil prédéterminé <= ARRET >=.

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