Apparatus and methods for adaptation of signal detection threshold in a wireless local area network device in accordance with measured noise power

• US 20050271133A1
• Filed: 06/02/2004
• Published: 12/08/2005
• Est. Priority Date: 06/02/2004
• Status: Abandoned Application

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Waxman, Shai
• Application Number:
  US10/857,847
• Publication Number:
  US 20050271133A1
• Time in Patent Office: Days
• US Class Current: 375/227
• CPC Class Codes: H04B 1/1027 assessing signal quality or detecting noise/interference for the received signal
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A wireless local area network device includes a receiver formed, at least in part, by a radio frequency front-end and a processor having a physical layer controller. The processor is to estimate a noise power in the receiver independent of whether the receiver is receiving a communication signal according to a communication standard, and to adaptively adjust an active energy detection threshold of the receiver to be higher than an energy of noise having the noise power. The processor may also adjust an effective energy detection threshold of the physical layer controller.

Claims

1. A method comprising:

estimating a noise power in a receiver of a wireless local area network device independent of whether said receiver is receiving a communication signal according to a communication standard; and

adjusting an active energy detection threshold of said receiver to be higher than an energy of noise having said noise power.

2. The method of claim 1, wherein estimating said noise power comprises:

generating samples of a digital output of a radio frequency front-end of said receiver at time intervals during a sampling period;

calculating powers of said samples; and

determining that said noise power is a lowest of said calculated powers,

wherein said sampling period has a duration that is longer than a duration of a longest permitted packet of communication signals according to said communication standard, and

wherein said time intervals are shorter than a shortest permitted gap between packets of communication signals according to said communication standard.

3. The method of claim 1, wherein adjusting said active energy detection threshold includes:

adjusting a gain of a low noise amplifier of said receiver.

4. The method of claim 1, further comprising:

adjusting an effective energy detection threshold of a physical layer controller of said receiver.

5. A method comprising:

estimating a noise power in a receiver of a wireless local area network device independent of whether said receiver is receiving a communication signal according to a communication standard, wherein estimating said noise power includes at least;

generating samples of a digital output of a radio frequency front-end of said receiver at time intervals during a sampling period;

calculating powers of said samples; and

determining that said noise power is a lowest of said calculated powers,

wherein said sampling period has a duration that is longer than a duration of a longest permitted packet of communication signals according to said communication standard, and wherein said time intervals are shorter than a shortest permitted gap between consecutive packets of communication signals according to said communication standard.

6. The method of claim 5, further comprising:

adjusting an active energy detection threshold of said receiver to be higher than an energy of noise having said noise power.

7. The method of claim 6, wherein adjusting said active energy detection threshold includes:

adjusting a gain of a low noise amplifier of said receiver.

8. The method of claim 6, further comprising:

adjusting an effective energy detection threshold of a physical layer controller of said receiver.

9. An article comprising a storage medium having stored thereon instructions that, when executed by a computing platform, result in:

estimating a noise power in a receiver of a wireless local area network device independent of whether said receiver is receiving a communication signal according to a communication standard; and

adjusting an active energy detection threshold of said receiver to be higher than an energy of noise having said noise power.

10. The article of claim 9, wherein executing said instructions further results in:

generating samples of a digital output of a radio frequency front-end of said receiver at time intervals during a sampling period;

calculating powers of said samples; and

determining that said noise power is a lowest of said calculated powers,

wherein said sampling period has a duration that is longer than a duration of a longest permitted packet of communication signals according to said communication standard, and

wherein said time intervals are shorter than a shortest permitted gap between packets of communication signals according to said communication standard.

11. The article of claim 9, wherein executing said instructions further results in:

adjusting an effective energy detection threshold of a physical layer controller of said receiver.

12. An article comprising a storage medium having stored thereon instructions that, when executed by a computing platform, result in:

estimating a noise power in a receiver of a wireless local area network device independent of whether said receiver is receiving a communication signal according to a communication standard, wherein estimating said noise power includes at least;

generating samples of a digital output of a radio frequency front-end of said receiver at time intervals during a sampling period;

calculating powers of said samples; and

determining that said noise power is a lowest of said calculated powers,

wherein said sampling period has a duration that is longer than a duration of a longest permitted packet of communication signals according to said communication standard, and wherein said time intervals are shorter than a shortest permitted gap between consecutive packets of communication signals according to said communication standard.

13. The article of claim 12, wherein executing said instructions further results in:

adjusting an active energy detection threshold of said receiver to be higher than an energy of noise having said noise power.

14. The article of claim 12, wherein executing said instructions further results in:

adjusting an effective energy detection threshold of a physical layer controller of said receiver.

15. A wireless local area network device comprising:

a receiver including at least;

a radio frequency front-end; and

a processor having a physical layer controller,

wherein said processor is to estimate a noise power in said receiver independent of whether said receiver is receiving a communication signal according to a communication standard, and to adjust an active energy detection threshold of said receiver to be higher than an energy of noise having said noise power.

16. The wireless local area network device of claim 15, wherein said front-end includes a low noise amplifier, and said processor is to adjust said active energy detection threshold at least in part by adjusting a gain of said low noise amplifier.

17. The wireless local area network device of claim 15, wherein said front-end has a digital output, and said processor is to generate samples of said digital output at time intervals during a sampling period, to calculate powers of said samples, and to determine that said noise power is a lowest of said calculated powers, wherein said sampling period has a duration that is longer than a duration of a longest permitted packet of communication signals according to said communication standard, and wherein said time intervals are shorter than a shortest permitted gap between packets of communication signals according to said communication standard.

18. The wireless local area network device of claim 15, wherein said wireless local area network device is a station.

19. The wireless local area network device of claim 15, wherein said wireless local area network device is an access point.

20. The wireless local area network device of claim 15, further comprising:

a dipole antenna coupled to said front-end.

21. A wireless local area network system comprising:

a first wireless local area network device; and

a second wireless local area network device comprising;

a receiver including at least;

a radio frequency front-end; and

a processor having a physical layer controller,

wherein said processor is to estimate a noise power in said receiver independent of whether said receiver is receiving a communication signal according to a communication standard, and to adjust an active energy detection threshold of said receiver to be higher than an energy of noise having said noise power.

22. The wireless local area network system of claim 21, wherein said front-end includes a low noise amplifier, and said processor is to adjust said active energy detection threshold at least in part by adjusting a gain of said low noise amplifier.

23. The wireless local area network system of claim 21, wherein said front-end has a digital output, and said processor is to generate samples of said digital output at time intervals during a sampling period, to calculate powers of said samples, and to determine that said noise power is a lowest of said calculated powers, wherein said sampling period has a duration that is longer than a duration of a longest permitted packet of communication signals according to said communication standard, and wherein said time intervals are shorter than a shortest permitted gap between packets of communication signals according to said communication standard.

24. The wireless local area network system of claim 21, wherein said second wireless local area network device is a station.

25. The wireless local area network system of claim 21, wherein said second wireless local area network device is an access point.