Method and apparatus for scaling the dynamic range of a receiver for continuously optimizing performance versus power consumption

• US 7,299,021 B2
• Filed: 09/13/2002
• Issued: 11/20/2007
• Est. Priority Date: 12/28/2001
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Gustafsson, Mikael, Hämäläinen, Miikka, Seppinen, Pauli, Vepsäläinen, Jussi, Pārssinen, Aarno
• Primary Examiner(s): Jackson; Blane J.
• Application Number:
  US10/243,331
• Publication Number:
  US 20030124999A1
• Time in Patent Office: 1,894 Days
• Field of Search: 455/67.11, 455/249.1, 455/295, 455/296, 455/311, 455/251.1, 455/250.1, 455/234.1, 455/226.1, 455/226.2, 455/226.3, 455/232.1, 330/129, 330/279, 375/345, 375/346, 4513431-3433
• US Class Current: 455/226.1
• CPC Class Codes: H04B 1/109 by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input

Abstract

Methods and apparatus are disclosed for operating a RF receiver. The method executes, during operation of the RF receiver, by periodically determining existing RF receiver operational conditions; determining RF receiver performance requirements based at least in part on the determined existing RF receiver operational conditions; and by allocating power consumption between RF receiver functional blocks in accordance with the determined RF receiver performance requirements and in accordance with a behavior model of at least one of the RF receiver as a whole and individual functional blocks of the RF receiver. The method may also monitor the resulting RF receiver signal quality to determine if allocation of power consumption has resulted in an optimum allocation of the power consumption.

Claims

1. A method for operating a radio frequency RF receiver, comprising:

during operation of the RF receiver, periodically determining existing RF receiver operational conditions, by separately measuring levels of signal interference associated with blocking and intermodulation of a received signal;

determining RF receiver performance requirements based at least in part on the determined existing RF receiver operational conditions, taking into consideration the measured levels of signal interference associated with blocking and intermodulation; and

allocating power consumption between RF receiver functional blocks in accordance with the determined RF receiver performance requirements using a behavior model of at least one of the RF receiver as a whole and individual functional blocks of the RF receiver, wherein the behavior model maps RF receiver performance requirements onto power consumption allocation.

2. A method as in claim 1, where determining existing RF receiver operational conditions further comprises measuring internal conditions of a transceiver of which the RF receiver is a part.

3. A method as in claim 1, further comprising monitoring resulting RF receiver signal quality to determine if the allocated power consumption comprises an optimum allocation of the power consumption.

4. A method as in claim 1, where said monitoring comprises monitoring the received signal in at least one of the RF, IF and BB sections of the receiver.

5. A method as in claim 1, where separately measuring levels of interference associated with blocking and intermodulation of the received signal comprises measuring the received signal at BB.

6. A method as in claim 1, where signal interference is measured in at least one of the RF, IF and BB sections of the receiver.

7. A method as in claim 1, where determining RE receiver performance requirements comprises determining at least one of:

a gain of the RE receiver a noise factor of the RF receiver, a third-order intercept point of the RF receiver, a second-order input intercept point of the RF receiver, an input compression point of the RF receiver and a correct value of gain for the RF receiver.

8. A method as in claim 1, where determining the RF receiver performance requirements comprises determining at least a phase noise of the RF receiver.

9. A method as in claim 8 where determining the phase noise further comprises reducing an associated requirement as a function of a distance in frequency between the received signal and an interfering signal.

10. A method as in claim 1, where allocating power consumption between RF receiver functional blocks further comprises at least one of:

varying at least one of a biasing current and a power supply voltage, bypassing at least one RF receiver functional block, switching between RF functional blocks, and changing feedback.

11. A method as in claim 1, where separately measuring further comprises identifying situations where interference being experienced by the RF receiver is dominated by at least one large blocking signal unrelated to intermodulation.

12. A method as in claim 11, where, when allocating power consumption between RF receiver functional blocks, less power consumption is allocated between RF receiver functional blocks than would occur if the signal interference resulted only from intermodulation interference.

13. A method as in claim 1, where the RE receiver performance requirements comprise an input compression point and a third order input intercept point requirements and where determining RE receiver performance requirements further comprises determining which of the input compression point requirement and the third order input intercept point requirement sets a more stringent requirement for RE receiver performance requirements and setting the RE receiver performance requirements based on the determination.

14. A method as in claim 1, where the operations further comprise:

receiving a desired quality of service;

where determining RF receiver performance requirements further comprises taking into consideration the desired quality of service;

determining a minimum power consumption capable of achieving the RE receiver performance requirements; and

where allocating power consumption between the RF receiver functional blocks further comprises allocating the minimum power consumption between the RE receiver functional blocks in accordance with the determined RF receiver performance requirements.

15. A method as in claim 14, where the desired quality of service is reduced to extend talk time due to low battery charge.

16. A method as in claim 1, further comprising:

determining whether the allocated power consumption comprises an optimal power consumption; and

in response to determining that the allocated power consumption comprises an optimal power consumption, reducing RF receiver headroom.

17. A method as in claim 1, where determining RF receiver performance requirements further comprises distributing available headroom in the RF receiver in dependence on at Least a noise figure, interference due to blocking signals and interference due to intermodulation.

18. A method as in claim 1 where determining RF receiver performance requirements further comprises estimating a phase noise specification of a local oscillator of the RF receiver by changing an input signal bandwidth of a signal monitoring circuit.

19. A method as in claim 1 where the RF receiver performance requirements are defined in terms of values for multiple RF receiver operating parameters and where the behavior model maps RF receiver performance requirements onto power consumption allocation in terms of the multiple RF receiver operating parameters.

20. A method as in claim 19 where the separate measurements of levels of signal interference associated with blocking and intermodulation of the received signal occur in a bandwidth wider than a channel bandwidth of the received signal.

21. A method as in claim 1 where the separate measurements of levels of signal interference associated with blocking and intermodulation of the received signal occur in a bandwidth wider than a channel bandwidth of the received signal.

22. A communications device comprising a radio frequency RF receiver, the RF receiver further comprising:

monitoring circuitry, operable during operation of the RF receiver, configured to periodically determine existing RF receiver operational conditions by separately measuring levels of signal interference associated with blocking and intermodulation of a received signal;

control circuitry configured to determine RF receiver performance requirements based at least in part on the determined existing RE receiver operational conditions, taking into consideration the measured levels of signal interference associated with blocking and intermodulation; and

power control circuitry configured to allocate power consumption between RF receiver functional blocks in accordance with the determined RF receiver performance requirements and a behavior model of at least one of the RF receiver as a whole and individual functional blocks of the RE receiver, wherein the behavior model maps RF receiver performance requirements onto power consumption allocation.

23. A communications device as in claim 22, where said monitoring circuitry is further configured to measure internal conditions of a transceiver of which the RF receiver is a part.

24. A communications device as in claim 22, where said power control circuitry is further configured to monitor resulting RF receiver signal quality and to determine if the allocated power consumption comprises an optimum allocation of the power consumption.

25. A communications device as in claim 22, where said monitoring circuitry is further configured to monitor the received signal in at least one of the RF, IF and BB sections of said RF receiver.

26. A communications device as in claim 22, where said control circuitry is configured to determine at least one of:

a gain of the RF receiver, a correct value of the gain of the RF receiver, a noise factor of the RF receiver, a third-order input intercept point of the RF receiver, a second-order input intercept point of the RF receiver, an input compression point of the RF receiver, and a phase noise of the RF receiver.

27. A communications device as in claim 22, where said power control circuitry is further configured to perform at least one of:

varying at least one of a biasing current and a power supply voltage, bypassing at least one RF receiver functional block, switching between RF receiver functional blocks, and.

28. A communications device as in claim 22 where the power control circuitry is further configured to determine whether the allocated power consumption comprises an optimal power consumption and where the control circuitry is further configured, in response to the power control circuitry determining that the allocated power consumption comprises an optimal power consumption, to reduce RF receiver headroom.

29. A communication device as in claim 22 where the RF receiver performance requirements comprise an input compression point requirement and a third order input intercept point requirement.

30. A communication device as in claim 29 where the control circuitry is further configured to determine which of the input compression point requirement and the third order input intercept point requirement sets a more stringent requirement for the RF receiver performance requirements and to set the RF receiver performance requirements based on the determination.

31. A communication device as in claim 22 where said monitoring circuitry is further configured to monitor the received signal at BB and where monitoring the received signal at BB comprises measuring at least one of RSS, SIR, Ec/Io, BER and BLER.

32. A communications device as in claim 22 where the RF receiver performance requirements are defined in terms of values for multiple RF receiver operating parameters and where the behavior model maps RF receiver performance requirements onto power consumption allocation in terms of the multiple RF receiver operating parameters.

33. A communications device as in claim 32 where the separate measurements by the monitoring circuitry of levels of signal interference associated with blocking and intermodulation of the received signal occur in a bandwidth wider than a channel bandwidth of the received signal.

34. A communications device as in claim 22 where the separate measurements by the monitoring circuitry of levels of signal interference associated with blocking and intermodulation of the received signal occur in a bandwidth wider than a channel bandwidth of the received signal.

35. A communications device comprising a radio frequency RF receiver, the RF receiver further comprising:

monitoring circuitry, operable during operation of the RF receiver, configured to periodically determine existing RF receiver operational conditions by separately measuring levels of signal interference associated with blocking and intermodulation of a received signal;

control circuitry configured to determine RF receiver performance requirements based at least in part on the determined existing RF receiver operational conditions, taking into consideration the measured levels of signal interference associated with blocking and intermodulation; and

power control circuitry configured to allocate reception performance power between RF receiver functional blocks in accordance with the determined RF receiver performance requirements and in accordance with a behavior model of at least one of the RF receiver as a whole and individual functional blocks of the RF receiver, wherein the behavior model maps RF receiver performance requirements onto reception performance power allocation.

36. A communications device as in claim 35 where the control circuitry is further configured to determine at least values for an input compression point requirement and a third-order input intercept point requirement for the RF receiver, based at least on the separate measurement of levels of signal interference associated with blocking and intermodulation of the received signal.

37. A communications device as in claim 35 where the control circuitry is further configured to compare the measured levels of signal interference associated with blocking and intermodulation of the received signal when determining RF receiver performance requirements.

38. A communications device as in claim 35 where the control circuitry is further configured to determine that signal interference being experienced by the RF receiver is dominated by a large blocking signal unrelated to intermodulation.

39. A communications device as in claim 38 where the power control circuitry is further configured to allocate less power consumption between RF receiver functional blocks than in the situation where the signal interference resulted from only intermodulation interference.

40. A communications device as in claim 35 where the monitoring circuitry is further configured to determine that at least one large interfering signal is present, and where the control circuitry is further configured to reserve only a portion of headroom of a signal-to-interference ratio of the RF receiver for noise figure requirements, with the remaining portion being reserved for other non-ideal characteristics of the Rf receiver.

41. A communications device as in claim 35 where the control circuitry is further configured to determine a phase noise requirement when determining RF receiver performance requirements.

42. A communications device as in claim 41 where the control circuitry is further configured to reduce the phase noise requirement as a function of a distance in frequency between the received signal and an interfering signal.

43. A communications device as in claim 35 where the control circuitry is further configured to receive a desired quality of service and the power control circuitry is further configured to optimize RF receiver performance according to a minimum necessary power consumption necessary to obtain the desired quality of service.

44. A communications device as in claim 43 where the desired quality of service is reduced to extend talk time due to a low battery charge.

45. A communications device as in claim 35 where the control circuitry is further configured to distribute available headroom in the RF receiver based on at least:

a noise figure, interference due to blocking signals, and interference due to intermodulation.

46. A communications device as in claim 35 where the control circuitry is further configured to estimate a phase noise specification of a local oscillator of the RF receiver by changing an input signal bandwidth of a signal monitoring circuit.

47. A communications device of claim 35 where the RF receiver performance requirements are defined in terms of values for multiple RF receiver operating parameters and where the behavior model maps RF receiver performance requirements onto reception performance power allocation in terms of the multiple RF receiver operating parameters.

48. A communications device of claim 35 where the monitoring circuitry further comprises an intermodulation detector configured to perform the separate measurements of levels of signal interference associated with blocking and intermodulation of the received signal in a bandwidth wider than a channel bandwidth of the received signal.

49. A radio frequency RF receiver comprising:

monitoring circuitry, operable during operation of the RF receiver, configured to periodically determine existing RF receiver operational conditions by separately measuring levels of signal interference associated with blocking and intermodulation of a received signal;

control circuitry configured to determine RF receiver performance requirements based at least in part on the determined existing RF receiver operational conditions, taking into consideration the measured levels of signal interference associated with blocking and intermodulation; and

power control circuitry configured to allocate power consumption between RF receiver functional blocks in accordance with the determined RF receiver performance requirements and in accordance with a behavior model of at least one of the RF receiver as a whole and individual functional blocks of the RF receiver, wherein the behavior model maps RF receiver performance requirements onto power consumption allocation.

50. A communications device as in claim 49 where the RF receiver performance requirements comprise an input compression point requirement and a third order input intercept point requirement and where the control circuitry is further configured to determine which of the input compression point requirement and the third order input intercept point requirement sets a more stringent requirement for the RF receiver performance requirements and to set the RF receiver performance requirements based on the determination.

51. A radio frequency RF receiver as in claim 49 where the RF receiver performance requirements are defined in terms of values for multiple RF receiver operating parameters and where the behavior model maps RF receiver performance requirements onto power consumption allocation in terms of the multiple RF receiver operating parameters.

52. A radio frequency RF receiver as in claim 49 where the separate measurements by the monitoring circuitry of levels of signal interference associated with blocking and intermodulation of the received signal occur in a bandwidth wider than a channel bandwidth of the received signal.

53. A communications device comprising a radio frequency RF receiver, the RF receiver further comprising:

means, operable during operation of the RF receiver, for periodically determining existing RF receiver operational conditions by separately measuring levels of signal interference associated with blocking and intermodulation of a received signal;

means for determining RF receiver performance requirements based, at least in part, on the determined existing RF receiver operational conditions, taking into consideration the measured levels of signal interference associated with blocking and intermodulation; and

means for allocating power consumption between RF receiver functional blocks in accordance with the determined RF receiver performance requirements and a behavior model of at least one of the RF receiver as a whole and individual functional blocks of the RF receiver, wherein the behavior model maps RF receiver performance requirements onto power consumption allocation.

54. A communications device as in claim 53 where the RF receiver performance requirements are defined in terms of values for multiple RF receiver operating parameters and where the behavior model maps RF receiver performance requirements onto power consumption allocation in terms of the multiple RF receiver operating parameters.

55. A communications device as in claim 54 where the separate measurements, by the means for periodically determining, of levels of signal interference associated with blocking and intermodulation of the received signal occur in a bandwidth wider than a channel bandwidth of the received signal.

56. A method of operating a radio frequency RF receiver comprised of RF receiver functional blocks, the method comprising:

during operation of the RF receiver, periodically determining existing RF receiver signal conditions by separately measuring levels of blocking power and intermodulation interference of a received signal;

determining RF receiver performance requirements, by separately determining input compression point and third-order input intercept point requirements, based at least in part on the determined existing RF receiver signal conditions, allocating power consumption between the RF receiver functional blocks in accordance with the determined RF receiver performance requirements, and

using a behavior model of the RF receiver as a whole and/or behavior models of individual ones of the RF receiver functional blocks, for mapping said RF receiver performance requirements onto the power consumption allocation.

57. A method as in claim 56 where the RF receiver performance requirements are defined in terms of values for multiple RF receiver operating parameters and where the behavior model maps RF receiver performance requirements onto power consumption allocation in terms of the multiple RF receiver operating parameters.

58. A method as in claim 56 where the separate measurements of levels of signal interference associated with blocking and intermodulation of the received signal occur in a bandwidth wider than a channel bandwidth of the received signal.

59. A communications device comprising:

a radio frequency RF receiver which comprises RF receiver functional blocks;

monitoring circuitry, operable during operation of the RF receiver, configured to periodically determine existing RF receiver signal conditions by separately measuring levels of blocking power and intermodulation interference of a received signal and further configured to determine RF receiver performance requirements, by separately determining an input compression point requirement and a third-order input intercept point requirement, based at least in part on the determined existing RF receiver signal conditions; and

power control circuitry configured to allocate power consumption between RF receiver functional blocks in accordance with the determined RE receiver performance requirements, the power control circuitry comprising a logic component configured to implement a behavior model of the RF receiver as a whole and/or behavior models of individual ones of the RF receiver functional blocks, wherein the logic component is further configured to map said RF receiver performance requirements onto power consumption allocation.

60. A communications device as in claim 59 where the RF receiver performance requirements are defined in terms of values for multiple RF receiver operating parameters and where the behavior model maps RF receiver performance requirements onto power consumption allocation in terms of the multiple RF receiver operating parameters.

61. A communications device as in claim 59 where the separate measurements by the monitoring circuitry of levels of signal interference associated with blocking and intermodulation of the received signal occur in a bandwidth wider than a channel bandwidth of the received signal. pg,47

62. A radio frequency RF integrated circuit comprising:

monitoring circuitry, operable during operation of the RF receiver, configured to periodically determine existing RF receiver operational conditions by separately measuring levels of signal interference associated with blocking and intermodulation of a received signal;

control circuitry configured to determine RF receiver performance requirements based at least in part on the determined existing RF receiver operational conditions, taking into consideration the measured levels of signal interference associated with blocking and intermodulation; and

power control circuitry configured to allocate power consumption between RF receiver functional blocks in accordance with the determined RF receiver performance requirements and in accordance with a behavior model of at least one of the RF receiver as a whole and individual functional blocks of the RF receiver, wherein the behavior model maps RF receiver performance requirements onto power consumption allocation.

63. A radio frequency RF integrated circuit as in claim 62 where the RF receiver performance requirements are defined in terms of values for multiple RF receiver operating parameters and where the behavior model maps RF receiver performance requirements onto power consumption allocation in terms of the multiple RF receiver operating parameters.

64. A radio frequency RF integrated circuit as in claim 62 where the separate measurements by the monitoring circuitry of levels of signal interference associated with blocking and intermodulation of the received signal occur in a bandwidth wider than a channel bandwidth of the received signal.