Method and arrangement for gain control

• US 20030069049A1
• Filed: 09/11/2002
• Published: 04/10/2003
• Est. Priority Date: 03/13/2000
• Status: Abandoned Application

• Current Assignee: Nokia Corporation
• Original Assignee: Nokia Corporation
• Inventors: Adolfsen, Pekka, Dekker, Andre, Poranen, Timo
• Application Number:
  US10/238,895
• Publication Number:
  US 20030069049A1
• Time in Patent Office: Days
• US Class Current: 455/572
• CPC Class Codes: H03F 1/34 Negative-feedback-circuit arrangements with or without positive feedback H03F1/02 - H03F1/30, H03F1/38 - H03F1/50, H03F3/50 take precedence ; for rejection of common mode signals H03F3/45479
• CPC Class Codes: H03F 3/24 of transmitter output stages
• CPC Class Codes: H03G 3/3047 for intermittent signals, e.g. burst signals
• CPC Class Codes: H04B 2001/0433 with linearisation using feedback

Abstract

The invention relates to a method and an arrangement implementing the method for gain control. In the method, a signal is modulated and the modulated signal is amplified with a power amplifier (312) to an output (313). A modulated signal of a given timeslot is applied to a control unit (323) before the power amplifier (312). Said amplified modulated signal is applied from the output (313) to the control unit (323). The signals are compared in the control unit, in which a control signals is also generated based on the comparison. The gain is controlled based on the control signal in a following at least one timeslot. The gain may also be controlled between timeslots, based on the control signal.

Claims

1. An arrangement for gain control, the arrangement comprising a modulator for modulating a signal and a power amplifier for amplifying the modulated signal to an output, the arrangement further comprising:

a control unit for comparing a modulated signal of a given timeslot, applied to the control unit before the power amplifier, with a modulated amplified signal of said given timeslot, applied to the control unit after the power amplifier, and for generating a control signal based on said comparison, and

a controller for gain control in a following at least one timeslot based on the control signal.

3. The arrangement as claimed in claim 1 or 2, further comprising a detector unit for detecting or creating the absolute value of the signal to be applied.

4. The arrangement as claimed in claim 1 or 2, further comprising a detector unit for detecting and creating the absolute value of the signal to be applied.

5. The arrangement as claimed in claim 1 or 2, wherein the timeslot is a timeslot according to the TDMA technology (Time Division Multiple Access).

6. The arrangement as claimed in claim 1 or 2, the arrangement further comprising a control unit for comparing the signals in at least one measuring sequence comprising a timeslot according to the TDMA technology (Time Division Multiple Access).

7. The arrangement as claimed in claim 1 or 2, the arrangement further comprising a control unit for comparing signal power values.

8. The arrangement as claimed in claim 1 or 2, the arrangement further comprising a control unit for comparing the local maximum power values of signals.

9. The arrangement as claimed in claim 1 or 2, the arrangement further comprising a control unit for comparing the global maximum power values of signals.

10. The arrangement as claimed in claim 1 or 2, the arrangement further comprising a control unit for generating a first processing result from the signal applied to the control unit before the power amplifier and for generating a second processing result from the signal applied to the control unit from the output.

11. The arrangement as claimed in claim 1 or 2, the arrangement further comprising a control unit for comparing the processing results for the generation of a control signal.

12. The arrangement as claimed in claim 1 or 2, the arrangement further comprising a control unit for processing signals by integration.

13. The arrangement as claimed in claim 1 or 2, the arrangement further comprising a control unit for processing signals based on weighted signal values.

14. The arrangement as claimed in claim 1 or 2, the arrangement further comprising a control unit for comparing the processed signals for the generation of a control signal.

15. The arrangement as claimed in claim 1 or 2, the arrangement further comprising one or more filters for performing part of the signal processing.

16. The arrangement as claimed in claim 1 or 2, the arrangement further comprising one or more detector units for performing part of the signal processing.

17. The arrangement as claimed in claim 1 or 2, wherein the control unit comprises an error parameter unit for generating error parameters and a control signal generator for generating at least one control signal based on the above error parameters.

18. The arrangement as claimed in claim 1 or 2, the arrangement further comprising a power level adjuster for adjustment the power level of the signal to be applied to the control unit to be comparable with the signal to be compared.

19. The arrangement as claimed in claim 1 or 2, wherein the control unit comprises one or more filters for processing.

20. The arrangement as claimed in claim 1 or 2, wherein the control unit comprises a memory, in which error parameters or a previously modelled arrangement response is stored.

21. The arrangement as claimed in claim 1 or 2, wherein the control unit comprises a memory, in which error parameters and a previously modelled arrangement response is stored.

22. The arrangement as claimed in claim 1 or 2, the arrangement further comprising a control unit for generating a control signal based on error parameters or a previously modelled arrangement response.

23. The arrangement as claimed in claim 1 or 2, the arrangement further comprising a control unit for generating a control signal based on error parameters and a previously modelled arrangement response.

24. The arrangement as claimed in claim 1 or 2, the arrangement further comprising a control unit, whose memory is updated, if need be.

25. The arrangement as claimed in claim 1 or 2, wherein the controller comprises a discrete controller.

26. The arrangement as claimed in claim 1 or 2, wherein the controller comprises a continuous controller.

27. The arrangement as claimed in claim 1 or 2, the arrangement further comprising a control unit for gain control based on a control signal on a digital signal before the power amplifier.

2. An arrangement for gain control, the arrangement comprising a modulator for modulating a signal and a power amplifier for amplifying the modulated signal to an output, the arrangement further comprising:

a control unit for comparing a modulated signal of a given timeslot, applied to the control unit before the power amplifier, with a modulated amplified signal of said given timeslot, applied to the control unit after the power amplifier, and for generating a control signal based on said comparison, and

a controller for gain control between timeslots based on the control signal.

28. A method for gain control, in which method a signal is modulated and the modulated signal is amplified with a power amplifier to an output, comprising

applying a modulated signal of a given timeslot before the power amplifier to a control unit,

applying said amplified modulated signal from the output to the control unit,

comparing the signals in the control unit,

generating a control signal in the control unit, based on the comparison

controlling the gain based on the control signal in a following at least one timeslot.

30. The method as claimed in claim 28 or 29, wherein the signal is applied detected or as an absolute value.

31. The method as claimed in claim 28 or 29, wherein the signal is applied detected and as an absolute value.

32. The method as claimed in claim 28 or 29, wherein the timeslot is a timeslot according to the TDMA technology (Time Division Multiple Access).

33. The method as claimed in claim 28 or 29, wherein the signals are compared in at least one measuring sequence comprising a timeslot according to the TDMA technology (Time Division Multiple Access).

34. The method as claimed in claim 28 or 29, wherein the signal power values are compared in the comparison.

35. The method as claimed in claim 28 or 29, wherein the local maximum power values of signals are compared in the comparison.

36. The method as claimed in claim 28 or 29, wherein the global maximum power values of signals are compared in the comparison.

37. The method as claimed in claim 28 or 29, wherein a first processing result is generated from the signal applied to the control unit before the power amplifier and a second processing result is generated from the signal applied to the control unit from the output.

38. The method as claimed in claim 28 or 29, wherein the processing results are compared with each other to generate a control signal.

39. The method as claimed in claim 28 or 29, wherein the signals are processed by integration.

40. The method as claimed in claim 28 or 29, wherein the processing of the signals is based on weighted signal values.

41. The method as claimed in claim 28 or 29, wherein the processed signals are compared to generate a control signal.

42. The method as claimed in claim 28 or 29, wherein the processing of the signals is partly performed by filtering with filters.

43. The method as claimed in claim 28 or 29, wherein the processing of the signals is performed in one or more detector units.

44. The method as claimed in claim 28 or 29, wherein error parameters are generated in the control unit, based on which a control signal is generated in the control unit.

45. The method as claimed in claim 28 or 29, wherein the power level of the signal to be applied to the control unit is set to be comparable with the signal to be compared.

46. The method as claimed in claim 28 or 29, wherein the processing is performed by filtering with one or more filters comprised by the control unit.

47. The method as claimed in claim 28 or 29, wherein the error parameters or the previously modelled arrangement response are stored in the memory of the control unit.

48. The method as claimed in claim 28 or 29, wherein the error parameters and the previously modelled arrangement response are stored in the memory of the control unit.

49. The method as claimed in claim 28 or 29, wherein a control signal is generated in the control unit based on the error parameters or the previously modelled arrangement response.

50. The method as claimed in claim 28 or 29, wherein a control signal is generated in the control unit based on the error parameters and the previously modelled arrangement response.

51. The method as claimed in claim 28 or 29, wherein the memory of the control unit is updated when necessary.

52. The method as claimed in claim 28 or 29, wherein the gain control based on the control signal is performed with a controller, which is a discrete controller.

53. The method as claimed in claim 28 or 29, wherein the gain control based on the control signal is performed with a controller, which is a continuous controller.

54. The method as claimed in claim 28 or 29, wherein the gain control based on the control is performed signal on a digital signal before the power amplifier.

29. A method for gain control, in which method a signal is modulated and the modulated signal is amplified with a power amplifier to an output, comprising

applying a modulated signal of a given timeslot before the power amplifier to a control unit,

applying said amplified modulated signal from the output to the control unit,

comparing the signals in the control unit,

generating a control signal in the control unit, based on the comparison,

controlling the gain based on the control signal between timeslots.