Signal configuration based transmitter adjustment in wireless communication devices

• US 20060068830A1
• Filed: 09/30/2004
• Published: 03/30/2006
• Est. Priority Date: 09/30/2004
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola Mobility LLC (Lenovo Group Ltd.)
• Inventors: Love, Robert T., Schwent, Dale G., Klomsdorf, Armin W., Schirmann, Ernest
• Granted Patent: US 8,521,204 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H03F 1/0211 with control of the supply voltage or current
• CPC Class Codes: H03F 1/0244 Stepped control
• CPC Class Codes: H03F 1/0261 with control of the polarisation voltage or current, e.g. gliding Class A
• CPC Class Codes: H04B 2001/0416 having gain or transmission power control
• CPC Class Codes: H04B 2201/70706 with means for reducing the peak-to-average power ratio
• CPC Class Codes: H04B 2201/70707 Efficiency-related aspects
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range

Abstract

A method in a wireless communication transmitter including a baseband processor (310) that dynamically configures the transmitter for a particular signal configuration, and a headroom controller (350) for adjusting transmitter headroom based on the particular signal configuration. In one embodiment, the PA headroom is controlled based on a power metric, for example, a 3^rd order polynomial or peak to average ratio (PAR) metric, that is a function of the signal configuration. In another embodiment the PA headroom is adjusted using information in a look up table.

Claims

1. A method in a wireless communication transmitter, the method comprising:

configuring the wireless communication transmitter for a particular signal configuration;

adjusting transmitter headroom based on the particular signal configuration,

the headroom is a measure of power margin available for producing a particular RMS output power for a particular signal configuration.

2. The method of claim 1,

adjusting transmitter headroom includes determining transmitter headroom for the particular signal configuration using a power metric dependent on the particular signal configuration.

3. The method of claim 2,

determining transmitter headroom using the power metric includes determining transmitter headroom based on a difference between a function of the particular signal configuration and a function of a reference signal configuration.

4. The method of claim 1,

adjusting transmitter headroom includes determining transmitter headroom for the particular signal configuration using a polynomial power metric dependent on the particular signal configuration.

5. The method of claim 1,

controlling one of a load, bias and supply voltage of the wireless communication transmitter based on power metric information obtained at an output of the wireless communication transmitter.

6. The method of claim 1,

determining transmitter headroom using a peak to average power ratio metric dependent on the particular signal configuration,

selecting the particular transmitter signal configuration after determining the transmitter headroom,

adjusting transmitter headroom based on the transmitter headroom determined using the peak to average power ratio metric.

7. The method of claim 1,

adjusting transmitter headroom includes selecting transmitter headroom for the particular signal configuration using a look-up table.

8. The method of claim 1,

adjusting transmitter headroom based on the particular signal configuration by adjusting one of transmitter supply voltage and transmitter load.

9. The method of claim 8,

adjusting wireless communication transmitter bias when adjusting headroom.

25. The method of claim 1, adjusting transmitter headroom periodically.

26. The method of claim 1, adjusting transmitter headroom dynamically.

10. A method in a wireless communication transmitter, the method comprising:

determining transmitter headroom information using a power metric dependent on a particular signal configuration;

configuring the wireless communication transmitter for the particular signal configuration after determining the transmitter headroom information;

adjusting transmitter headroom for the particular signal configuration based on the transmitter headroom information determined using the power metric.

11. The method of claim 10,

determining transmitter headroom information includes determining transmitter headroom information for the particular signal configuration using a polynomial power metric dependent on the particular signal configuration.

12. The method of claim 11,

determining transmitter headroom information using the polynomial power metric includes determining transmitter headroom information for the particular signal configuration using a polynomial power metric devoid of even ordered terms.

13. The method of claim 10,

determining transmitter headroom information includes determining transmitter headroom information for the particular signal configuration using a peak to average power ratio metric dependent on the particular signal configuration.

14. The method of claim 10,

determining transmitter headroom information using the power metric includes computing a difference between a function of the particular signal configuration and a function of a reference signal configuration.

15. The method of claim 14, determining transmitter headroom information using the power metric includes scaling the computed difference.

16. The method of claim 14,

determining transmitter headroom information using the power metric includes computing a difference between a polynomial function dependent on the particular signal configuration and the polynomial function dependent on a reference signal configuration.

17. The method of claim 14,

determining transmitter headroom information using the power metric includes computing a difference between a polynomial function devoid of even ordered terms dependent on the particular signal configuration and the polynomial function devoid of even numbered terms dependent on a reference signal configuration.

18. The method of claim 14,

determining transmitter headroom information using the power metric includes computing a difference between a peak to average power function dependent on the particular signal configuration and the peak to average power function dependent on a reference signal configuration.

19. The method of claim 10,

adjusting transmitter headroom information based on the particular signal configuration by adjusting one of transmitter supply voltage and transmitter load.

20. The method of claim 19,

adjusting wireless communication transmitter bias when adjusting transmitter headroom.

21. The method of claim 10,

controlling the wireless communication transmitter based on power metric information obtained at an output of the wireless communication transmitter.

22. A method in a wireless communication transmitter, the method comprising:

determining transmitter headroom based on a particular signal configuration using a look up table;

configuring the wireless communication transmitter for the particular signal configuration after determining the transmitter headroom;

adjusting transmitter headroom for the particular signal configuration based on the transmitter headroom determined using the look up table.

23. The method of claim 22,

determining transmitter headroom based on the particular signal configuration and based on signal power considerations using the look up table.

24. The method of claim 22,

adjusting at least one of wireless communication device transmitter supply voltage, bias and load based on the particular signal configuration.

27. A method in a wireless communication transmitter, the method comprising:

determining a power metric based on a particular signal configuration of the transmitter;

adjusting transmitter output power based on the power metric.

28. The method of claim 27, adjusting transmitter headroom based on the particular signal configuration of the transmitter.

29. The method of claim 27, determining a power metric includes determining a polynomial power metric.

30. A method in a wireless communication transmitter, the method comprising:

configuring the wireless communication transmitter for a particular signal configuration;

adjusting transmitter output power based on the particular signal configuration using a look up table.