Method and apparatus to control power of transmitter

1. A method comprising:

at a time slot of receiving a data block which includes power control information, controlling a power level of a transmitted signal based on the power control information received with the data block by varying an input signal level and a gain of the transmitted signal, wherein varying the input signal level includes:

sampling a feedback signal of the transmitted signal;

storing a first sample of the feedback signal;

comparing the first sample to other samples of the feedback signal;

advancing the level of the input signal toward its initial level when the first sample is substantially equal to one of the other samples; and generating a control signal based on the results of the comparing.

2. The method of claim 1 , wherein controlling a power level comprises:

adaptively learning a gain transfer function by varying a control power voltage of a transmitter that transmits the transmitted signal.

3. The method of claim 2 , wherein adaptively learning comprises:

sampling a feedback signal of the transmitted signal; and

adjusting the input level of the input signal to its initial level according to samples of the feedback signal.

4. The method of claim 1 , wherein controlling the power level of the transmitted signal comprises:

setting the input signal level to a predetermined level;

adjusting the gain of a transmitter that transmits the transmitted signal; and

advancing the level of the input signal toward its initial level.

5. The method of claim 1 , wherein varying the gain of the transmitted signal comprises attenuating a power of a modulated transmitted signal.

6. An apparatus comprising:

a step attenuator to set at a time slot of receiving a data block a level of an input signal of a transmitted signal based on a target power value provided by the data block;

a transmitter to transmit a signal at the target power value; and

a power control module to advance the level of the input signal to its initial level based on a feedback signal, to provide a control signal to adjust a gain of the transmitter and to adaptively learn a gain transfer function of the transmitter by applying to the control signal prestored coefficients of the gain transfer function.

7. The apparatus of claim 6 , further comprising:

a feedback loop to provide the feedback signal to the power control module; and

a memory to store a first sample of the feedback signal.

8. The apparatus of claim 6 , wherein the control module comprises a processor.

9. The apparatus of claim 6 , wherein the transmitter comprises controllable circuitry and the power control module is able to adjust the power of the transmitter by providing the control signal to the controllable circuitry.

10. An apparatus comprising:

a dipole antenna to receive a data block;

a step attenuator to set at a time slot of receiving a data block a level of an input signal of a transmitted signal based on a target power value provided by the data block;

a transmitter to transmit a signal at the target power value; and

a power control module to advance the level of the input signal to its initial level based on a feedback signal, to provide a control signal to adjust a gain of the transmitter and to adaptively learn a gain transfer function of the transmitter by applying to the control signal prestored coefficients the gain transfer function.

11. The apparatus of claim 10 , further comprising:

a feedback loop to provide the feedback signal to the power control module; and

a memory to store a first sample of the feedback signal.

12. The apparatus of claim 10 , wherein the control module is able to generate a control signal based on the results of comparing the first sample to the other samples.

13. The apparatus of claim 10 , wherein the control module comprises a processor.

14. The apparatus of claim 10 , wherein the transmitter comprises controllable circuitry and the power control module is able to adjust the power of the transmitter by providing the control signal to the controllable circuitry.

15. An article comprising: a storage medium having stored thereon instructions that when executed result in:

at a time slot of receiving a data block which includes power control information, controlling a power level of a transmitted signal based on the power control information received with the data block by varying an input signal level and a gain of the transmitted signal wherein varying the input signal level includes:

sampling a feedback signal of the transmitted signal;

storing a first sample of the feedback signal;

comparing the first sample to other samples of the feedback signal;

advancing the level of the input signal toward to its initial level when the first sample is substantially equal to one of the other samples; and generating a control signal based on the results of the comparing.

16. The article of claim 15 wherein, the instructions when executed further result in: adaptively learning a gain transfer function by varying a control power voltage of a transmitter that transmits the transmitted signal.

17. The article of claim 15 wherein, the instructions when executed further result in:

sampling a feedback signal of the transmitted signal; and

adjusting the input level of the input signal to its initial level according to samples of the feedback signal.

18. The article of claim 15 wherein, the instructions when executed further result in:

setting the input signal level to a predetermined level;

adjusting the gain of a transmitter that transmits the transmitted signal; and

advancing the level of the input signal toward its initial level.

19. The article of claim 15 wherein, the instructions when executed further result in:

attenuating a power of a modulated transmitted signal.