Toneless telemetry in a wireless system

• US 7,206,591 B2
• Filed: 08/12/2004
• Issued: 04/17/2007
• Est. Priority Date: 08/13/2003
• Status: Expired due to Fees

• Current Assignee: Reveal Imaging, LLC
• Original Assignee: Xytrans, Inc.
• Inventors: Ammar, Danny F., Tsang, Heung K.
• Primary Examiner(s): Trinh; Sonny
• Application Number:
  US10/918,652
• Publication Number:
  US 20050048993A1
• Time in Patent Office: 978 Days
• Field of Search: 455/3.01, 455/3.02, 455/3.03, 455/3.04, 455/3.05, 455/12.1, 455/13.1, 455133-137, 455272-273, 455/278.1, 455/502, 375/219, 375/257
• US Class Current: 455/502
• CPC Class Codes: H04B 1/18 Input circuits, e.g. for coupling to an antenna or a transmission line coupling networks between antennas or lines and receivers independent of the nature of the receiver H03H
• CPC Class Codes: H04B 1/40 Circuits

Abstract

The present invention is directed to indoor/outdoor wireless communication systems and methods. Communications between an indoor unit and outdoor unit do not require telemetry tones. The input DC voltage level from the indoor unit is reduced to a level below the normal operating range for the outdoor unit. This is recognized by the outdoor unit as a signal to start receiving telemetry data, which is sent from the indoor unit to the outdoor unit by modulating the transmit signal.

Claims

1. A wireless communication system comprising:

an indoor unit;

an outdoor unit in communication with the indoor unit, wherein the indoor unit is operative for transmitting a signal to the outdoor unit at a reduced DC voltage level below a normal operating range for the outdoor unit as signal recognized by the outdoor unit to begin receiving data, wherein the outdoor unit further comprises a transmitter, a detector circuit for detecting the level of a signal between the indoor unit and outdoor unit, and a switch operative with the detector circuit and the transmitter for shutting down the transmitter for receiving data.

2. A wireless communication system according to claim 1, and further comprising a coaxial cable interconnecting the indoor unit and outdoor unit over which transmit data and receive data to and from the indoor unit and outdoor unit pass.

3. A wireless communication system according to claim 2, wherein the transmit data and receive data are at two different intermediate frequencies.

4. A wireless communication system according to claim 1, wherein the data comprises telemetry data.

5. A wireless communication system according to claim 1, wherein the transmitter in the outdoor unit further comprises an amplifier and the switch is operative for shutting down the amplifier.

6. A wireless communication system according to claim 5, and further comprising a processor operative with the amplifier for adjusting gate bias thereon.

7. A wireless communication system according to claim 1, wherein the outdoor unit is operative for modulating current draw, and said indoor unit comprises a current sensor that detects the modulating current draw as a binary sequence of messages.

8. A wireless communication system comprising:

an indoor unit;

an outdoor unit in communication with the indoor unit, wherein the indoor unit is operative for transmitting a signal to the outdoor unit at a reduced DC voltage level below a normal operating range for the outdoor unit, said outdoor unit further comprising a transmitter, a detector circuit for detecting the level of the signal between the indoor unit and outdoor unit, and a switch operative with the detector circuit and the transmitter for shutting down the transmitter for receiving the data when a reduced DC voltage signal level is sensed by the detector circuit.

9. A wireless communication system according to claim 8, and further comprising a coaxial cable interconnecting the indoor unit and outdoor unit over which transmit data and receive data to and from the indoor unit and outdoor unit pass.

10. A wireless communication system according to claim 9, wherein the transmit data and receive data are at two different intermediate frequencies.

11. A wireless communication system according to claim 8, wherein the data comprises telemetry data.

12. A wireless communication system according to claim 8, wherein the transmitter in the outdoor unit further comprises an amplifier, wherein said switch is operative for shutting down the amplifier.

13. A wireless communication system according to claim 12, and further comprising a processor operative with the amplifier for adjusting gate bias thereon.

14. A wireless communication system according to claim 8, wherein the outdoor unit is operative for modulating current draw, and said indoor unit comprises a current sensor that detects the modulating current draw as a binary sequence of messages.

15. A method of communicating between an indoor unit and outdoor in a wireless communication system, which comprises:

reducing an input DC voltage level from the indoor unit to a level below a normal operating range for the outdoor unit as a signal recognized by the outdoor unit to begin receiving data; and

modulating current draw by pulsing an amplifier within the outdoor unit and sensing the modulating current draw within the current sensor as a binary sequence of messages.

16. A method according to claim 15, which further comprises receiving telemetry data after reducing the input DC voltage level.

17. A method according to claim 15, which further comprises sending data from the indoor unit to the outdoor unit by modulating a transmit signal.

18. A method according to claim 15, which further comprises turning off a transmitter in the outdoor unit for receiving the data.

19. A method according to claim 18, which further comprises turning off an amplifier within the outdoor unit for receiving the data.

20. A method of communicating between an indoor unit and outdoor in a wireless communication system, which comprises:

reducing an input DC voltage level from the indoor unit to a level below a normal operating range for the outdoor unit;

sensing within the outdoor unit the level of the signal from the indoor unit as a signal recognized by the outdoor unit to begin receiving data;

turning off a transmitter in the outdoor unit when receiving data; and

sensing the signal using a detector within the outdoor unit that receives a transmit intermediate frequency and generating a signal to a processor for controlling an amplifier in the transmitter of the outdoor unit.

21. A method according to claim 20, which further comprises turning off a transmitter within the outdoor unit if a transmit signal from the indoor unit is not present to reduce dissipated DC power and temperature rise within the outdoor unit.

22. A method according to claim 20, which further comprises controlling gate bias on the amplifier.

23. A method according to claim 20, which further comprises receiving telemetry data after reducing the input DC voltage level.

24. A method according to claim 20, which further comprises sending data from the indoor unit to the outdoor unit by modulating a transmit signal.

25. A method according to claim 20, which further comprises modulating current draw by pulsing an amplifier within the outdoor unit and sensing the modulating current draw within the current sensor as a binary sequence of messages.