Method and apparatus for the control of modem transmit power
First Claim
1. In a PCM modem system including an analog modem coupled to a digital modem, a method for controlling the transmit power of the analog modem, comprising the steps of:
- detecting the transmit power level of the analog modem; and
,adjusting the transmit power level of the analog modem in accordance with the difference between the detected transmit power level and a desired transmit power level,wherein said detecting and said adjusting are performed during design of a constellation, and wherein the transmit power level of the analog modem is used as a parameter in the design of the constellation.
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Accused Products
Abstract
A method and apparatus is provided for controlling the transmit power of an analog modem when the transmit power level 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. In one embodiment, the power level at the analog modem is sensed to ascertain if it is not at the desired transmit power level, with adjustment being provided by transmitting the desired change in the transmit power level to the digital modem, whereupon mapping parameters are redefined by adjusting the number of equivalence classes, thus to adjust transmit power at analog modem.
11 Citations
22 Claims
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1. In a PCM modem system including an analog modem coupled to a digital modem, a method for controlling the transmit power of the analog modem, comprising the steps of:
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detecting the transmit power level of the analog modem; and
,adjusting the transmit power level of the analog modem in accordance with the difference between the detected transmit power level and a desired transmit power level, wherein said detecting and said adjusting are performed during design of a constellation, and wherein the transmit power level of the analog modem is used as a parameter in the design of the constellation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. In a PCM modem system including an analog modem coupled to a digital modem, a method for controlling the transmit power of either of the modems, comprising the steps of:
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detecting the transmit power level of a modem; and
,adjusting the transmit power level at the modem in accordance with the difference between the detected transmit power level at the modem and a desired transmit power level, wherein said detecting and said adjusting are performed during design of a constellation, and wherein the transmit power level of the analog modem is used as a parameter in the design of the constellation. - View Dependent Claims (11)
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12. In a PCM modem system including an analog modem coupled to a digital modem, a method for controlling a transmit power of either of the modems comprising:
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measuring a transmit power level of at least one of the analog modem and the digital modem; and using the measured transmit power level as a parameter in designing a constellation. - View Dependent Claims (13, 14, 15, 16)
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17. A PCM modem system, comprising:
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a digital modem which designs an initial constellation; an analog modem which measures a transmit power of the analog modem for the initial constellation, said analog modem provides information relating to the transmit power of the analog modem for the initial constellation to the digital modem; wherein the digital modem uses the information relating to the transmit power of the analog modem for the initial constellation to determine whether to modify the initial constellation. - View Dependent Claims (18, 19, 20)
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21. In a PCM modem system including an analog modem coupled to a digital modem, a method for controlling the transmit power of the analog modem, comprising the steps of:
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detecting the transmit power level of the analog modem; and
,adjusting the transmit power level of the analog modem in accordance with the difference between the detected transmit power level and a desired transmit power level.
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22. In a PCM modem system including an analog modem coupled to a digital modem, a method for controlling the transmit power of either of the modems, comprising the steps of:
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detecting the transmit power level of a modem; and
,adjusting the transmit power level at the modem in accordance with the difference between the detected transmit power level at the modem and a desired transmit power level.
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Specification