Mitigating interference to nearby radio systems based on characterization of adjacent channels

• US 20060166692A1
• Filed: 01/24/2005
• Published: 07/27/2006
• Est. Priority Date: 01/24/2005
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Schiffer, Jeffrey, Waltho, Alan E.
• Granted Patent: US 7,907,904 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/243 taking into account interferences

Abstract

A wireless device dynamically controls a power level for each channel in a transmission spectrum. The power level is adjusted based on characteristics of signals received in the adjacent channels which results in the wireless device working at maximum ranges consistent with not causing interference to other users of the spectrum.

Claims

1. A wireless device, comprising:

a transceiver coupled to an antenna; and

a power amplifier to provide a signal to transmit at the antenna, the power amplifier having an adaptive power control set in response to a characterization of adjacent channels.

2. The wireless device of claim 1 wherein the characterization includes determining a type of modulation used by signals in the adjacent channels.

3. The wireless device of claim 1 wherein characteristics of the adjacent channels include a power measurement to determine a lower power in one of the adjacent channels.

4. The wireless device of claim 3 wherein the adaptive power control is set based on the type of modulation and the lower power of received power levels of the adjacent channels.

5. The wireless device of claim 1 wherein the adaptive power control is set based on a characteristic of an occupied adjacent channel in the event that one adjacent channel is vacant.

6. The wireless device of claim 1 wherein the adaptive power control is set to allow the power amplifier to transmit at full power in the event that both adjacent channels are vacant.

7. A wireless device, comprising:

an antenna to transmit a signal on a first channel;

a channel receiver to provide characteristics of channels adjacent to the first channel; and

a power amplifier to provide a signal to transmit on the first channel and having an adaptive power control set in response to the characteristics of the channels adjacent to the first channel.

8. The wireless device of claim 7 further including a level detector coupled to the channel receiver.

9. The wireless device of claim 8 further including an analog-to-digital converter coupled to the level detector.

10. The wireless device of claim 9 further including a programmable power adjustor coupled to the analog-to-digital converter to provide the adaptive power control to the power amplifier.

11. The wireless device of claim 7 wherein the programmable power adjustor provides preset values to adjust the signal on the first channel.

12. A method of transmitting a signal on a first channel by a wireless device, comprising:

investigating, in the wireless device, received signals to determine characteristics of channels adjacent to the first channel; and

adjusting a power amplifier to provide a signal to transmit on the first channel set in response to the characteristics of the channels adjacent to the first channel.

13. The method of claim 12 further comprising:

extracting time averaged amplitude coefficients for the channels adjacent to the first channel.

14. The method of claim 13 further comprising:

converting analog values of the time averaged amplitude coefficients to time sampled digital values.

15. The method of claim 14 further comprising:

determining a lower power in one of the channels adjacent to the first channel to provide a transmitter power for the first channel.

16. The method of claim 15 further including:

comparing an allowable transmitter power with a current transmitter power.

17. The method of claim 16 further including:

generating a correction signal to adjust the signal supplied to the power amplifier.

18. The method of claim 12 further including:

dynamically adjusting the adaptive power control for the first channel based on a modulation type and a power of the channels adjacent to the first channel.

19. The method of claim 12 setting the adaptive power control based on an occupied adjacent channel in the event that one adjacent channel is vacant.

20. The method of claim 12 setting the adaptive power control at full power in the event that both adjacent channels are vacant.