Method and apparatus for the control of modem transmit power

Details Method and apparatus for the control of modem transmit power Method and apparatus for the control of modem transmit power

H - Electricity

04

B

H04B 1/38 (2006.01) H04B 1/00 (2006.01) H04B 1/10 (2006.01) H04B 3/04 (2006.01) H04B 7/005 (2006.01) H04B 14/04 (2006.01) H04L 25/49 (2006.01)

Patent

CA 2398487

A method and apparatus is provided for controlling the transmit power of an analog modem (12) when the transmit power does not match the desired transmit power level, thus conforming to FCC regulations on transmit power and/or eliminating non-linearities associated with higher than required power levels and loss of signal-to-noise ratio and concomitant at loss of data rate if the transmit power levels are less than that desired. The power level (26) at the analog modem (12) is sensed to ascertain if it is not at the desired transmit power level (28), with adjustment being provided by transmitting the desired change (30) in the transmit power level to the digital modem (18), whereupon mapping parameters (34, 36) are redefined by adjusting the number of equivalence classes, thus to adjust transmit power at analog modem (12).

L'invention porte sur un procédé et un appareil réglant la puissance de transmission d'un modem analogique (12) quand elle n'atteint pas le niveau désiré, afin de la rendre conforme aux normes FCC sur la puissance de transmission, et/ou éliminer les non linéarités associées à une puissance d'un niveau dépassant les besoins, ainsi que les pertes de rapport signal/bruit, et les réductions concomitantes de débit associées à une puissance d'un niveau inférieur aux besoins. A cet effet, on mesure la puissance (26) du modem analogique (12) pour savoir si elle n'est pas au niveau (28) désiré, et on transmet le cas échéant les modifications désirées au modem numérique (18), puis on redéfinit les paramètres (34, 36) de concordance en ajustant le nombre des classes d'équivalence, et par là, la puissance de transmission du modem analogique (12).

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