Antenna based listen-before-talk apparatus, system and method

• US 20080039035A1
• Filed: 08/10/2006
• Published: 02/14/2008
• Est. Priority Date: 08/10/2006
• Status: Abandoned Application

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Posamentier, Joshua
• Application Number:
  US11/503,429
• Publication Number:
  US 20080039035A1
• Time in Patent Office: Days
• US Class Current: 455/185.1
• CPC Class Codes: H04B 1/1607 Supply circuits converters H02M; filters therefor H02M1/14; voltage stabilisers G05F1/46
• CPC Class Codes: H04B 1/44 Transmit/receive switching

Abstract

An embodiment of the present invention provides an apparatus, comprising an antenna capable of taking listen-before-talk (LBT) measurements. The antenna may further comprise an active peak/envelope detector, a comparator, and a bias-tee for extracting DC off of a coaxial feed feeding the antenna. In an embodiment of the present invention, the apparatus may further comprise a radio transceiver including a current source, a bias tee, and a current sense circuit for detecting behavior of the antenna.

Claims

1. An apparatus, comprising:

an antenna adapted to take listen-before-talk (LBT) measurements.

2. The apparatus of claim 1, wherein said antenna further comprises:

an active peak/envelope detector;

a comparator; and

a bias-tee for extracting DC off of a coaxial feed feeding said antenna.

3. The apparatus of claim 2, further comprising:

a radio transceiver including a current source, a bias tee, and a current sense circuit for detecting behavior of said antenna.

4. The apparatus of claim 3, wherein said apparatus injects a fixed voltage into a coax center conductor via a bias-tee to power electronics in said antenna.

5. The apparatus of claim 4, wherein said antenna'"'"'s bias tee extracts said fixed voltage which is then used to power said active peak/envelope detector, said comparator, and a relay.

6. The apparatus of claim 4, wherein said antenna'"'"'s bias tee extracts said fixed voltage which is then used to power said active peak/envelope detector, said comparator, and an FET circuit that draws a variable current greater than component power consumption.

7. The apparatus of claim 5, further comprising a directional coupler inline with an antenna element with a reverse power leg feeding a peak detector via a bandpass filter.

8. The apparatus of claim 7, further comprising a low noise amplifier (LNA) placed before the peak detector to lower the minimum detectable signal and wherein the output from said peak detector is filtered to remove any amplitude modulation and smooth the response before being fed into a comparator'"'"'s input.

9. The apparatus of claim 8, wherein said comparator'"'"'s threshold is set at whatever point is necessary to meet an LBT threshold requirement in a target regulatory region and once said threshold is exceeded, said comparator then drives said relay which closes a switch which then sinks sufficient current that results in a distinct increase in current draw over said coax line which a current sense circuit in said transceiver can detect, thus comprehending an ambient signal level at the antenna which then restricts transmission activity.

10. A method, comprising:

taking listen-before-talk (LBT) measurements in an antenna.

11. The method of claim 10, further comprising using an active peak/envelope detector, a comparator and a bias-tee that extracts DC voltage off of a coaxial feed feeding said antenna to take said LBT measurements.

12. The method of claim 11, further comprising:

detecting behavior of said antenna by using a radio transceiver including a current source, a bias tee, and a current sense circuit.

13. The method of claim 12, further comprising injecting a fixed voltage into a coax center conductor via a bias-tee to power electronics in said antenna.

14. The method of claim 13, further comprising extracting said fixed voltage by said antenna'"'"'s bias tee which is then used to power said active peak/envelope detector, said comparator, and a relay.

15. The method of claim 13, further comprising extracting said fixed voltage by antenna'"'"'s bias tee which is then used to power said active peak/envelope detector, said comparator, and an FET circuit that draws a variable current greater than component power consumption.

16. The method of claim 14, further comprising using a directional coupler inline with an antenna element with a reverse power leg feeding a peak detector via a bandpass filter.

17. The method of claim 16, further comprising placing a low noise amplifier (LNA) before the peak detector to lower the minimum detectable signal and filtering the output from said peak detector to remove any amplitude modulation and smooth the response before being fed into a comparator'"'"'s input.

18. The method of claim 17, further comprising setting said comparator'"'"'s threshold at whatever point is necessary to meet an LBT threshold requirement in a target regulatory region and once said threshold is exceeded, said comparator then drives said relay which closes a switch which then sinks sufficient current that results in a distinct increase in current draw over said coax line which a current sense circuit in said transceiver can detect, thus comprehending an ambient signal level at the antenna which then restricts transmission activity.

19. A machine-accessible medium that provides instructions, which when accessed, cause a machine to perform operations comprising:

taking listen-before-talk (LBT) measurements in an antenna.

20. The machine-accessible medium of claim 19, further comprising said instructions causing said machine to perform operations further comprising using an active peak/envelope detector, a comparator and a bias-tee that extracts DC voltage off of a coaxial feed feeding said antenna to take said LBT measurements.

21. The machine-accessible medium of claim 20, further comprising said instructions causing said machine to perform operations further comprising detecting behavior of said antenna by using a radio transceiver including a current source, a bias tee, and a current sense circuit.

22. The machine-accessible medium of claim 21, further comprising said instructions causing said machine to perform operations further comprising injecting a fixed voltage into a coax center conductor via a bias-tee to power electronics in said antenna.

23. The machine-accessible medium of claim 22, further comprising said instructions causing said machine to perform operations further comprising extracting said fixed voltage by said antenna'"'"'s bias tee which is then used to power said active peak/envelope detector, said comparator, and a relay.

24. The machine-accessible medium of claim 22, further comprising said instructions causing said machine to perform operations further comprising extracting said fixed voltage by antenna'"'"'s bias tee which is then used to power said active peak/envelope detector, said comparator, and an FET circuit that draws a variable current greater than component power consumption.

25. The machine-accessible medium of claim 23, further comprising said instructions causing said machine to perform operations further comprising using a directional coupler inline with an antenna element with a reverse power leg feeding a peak detector via a bandpass filter.

26. The machine-accessible medium of claim 25, further comprising said instructions causing said machine to perform operations further comprising placing a low noise amplifier (LNA) before the peak detector to lower the minimum detectable signal and filtering the output from said peak detector to remove any amplitude modulation and smooth the response before being fed into a comparator'"'"'s input.

27. The machine-accessible medium of claim 26, further comprising said instructions causing said machine to perform operations further comprising setting said comparator'"'"'s threshold at whatever point is necessary to meet an LBT threshold requirement in a target regulatory region and once said threshold is exceeded, said comparator then drives said relay which closes a switch which then sinks sufficient current that results in a distinct increase in current draw over said coax line which a current sense circuit in said transceiver can detect, thus comprehending an ambient signal level at the antenna which then restricts transmission activity.

28. A system, comprising:

an antenna capable of taking listen-before-talk (LBT) measurements; and

a radio transceiver including a current source, a bias tee, and a current sense circuit for detecting behavior of said antenna.

29. The system of claim 28, wherein said antenna further comprises:

an active peak/envelope detector;

a comparator; and

a bias-tee for extracting DC off of a coaxial feed feeding said antenna.

30. The system of claim 29, wherein said apparatus injects a fixed voltage into a coax center conductor via a bias-tee to power electronics in said antenna.

31. The system of claim 30, wherein said antenna'"'"'s bias tee extracts said fixed voltage which is then used to power said active peak/envelope detector, said comparator, and a relay and.

32. The system of claim 30, wherein said antenna'"'"'s bias tee extracts said fixed voltage which is then used to power said active peak/envelope detector, said comparator, and an FET circuit that draws a variable current greater than component power consumption.

33. The system of claim 31, further comprising a directional coupler inline with an antenna element with a reverse power leg feeding a peak detector via a bandpass filter and a low noise amplifier (LNA) placed before the peak detector to lower the minimum detectable signal and wherein the output from said peak detector is filtered to remove any amplitude modulation and smooth the response before being fed into a comparator'"'"'s input.

34. The system of claim 33, wherein said comparator'"'"'s threshold is set at whatever point is necessary to meet an LBT threshold requirement in a target regulatory region and once said threshold is exceeded, said comparator then drives said relay which closes a switch which then sinks sufficient current that results in a distinct increase in current draw over said coax line which a current sense circuit in said transceiver can detect, thus comprehending an ambient signal level at the antenna which then restricts transmission activity.