Control system for controlling an output signal power level of a wireless transmitter

• US 7,177,606 B2
• Filed: 07/10/2002
• Issued: 02/13/2007
• Est. Priority Date: 07/10/2002
• Status: Expired due to Fees

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: General Instrument Corporation (CommScope Holding Company, Inc.)
• Inventors: Chen, Keming Joseph
• Primary Examiner(s): NGUYEN, THUAN T
• Application Number:
  US10/195,017
• Publication Number:
  US 20040092237A1
• Time in Patent Office: 1,679 Days
• Field of Search: 455/126, 455/127.1, 455/130, 455/133, 455/136, 455/140, 455/192.1, 455/200.1, 455/177.1, 455/182.1, 455/227, 455/232.1, 455/334, 455/339, 455/340
• US Class Current: 455/126
• CPC Class Codes: H03G 3/3042 in modulators, frequency-changers, transmitters or power amplifiers transmission power control in bidirectional transmission systems H04W52/04
• CPC Class Codes: H04B 2001/0416 having gain or transmission power control

Abstract

A method and system for controlling an output signal power level of a wireless transmitter can be created by detecting the signal power level of the transmitter with a detector, selectively attenuating the output signal power level with an attenuator having variable attenuation levels, and monitoring the output signal power level and comparing the output signal power level, as determined by the detector, to a predetermined threshold with a processor. The processor preferably controls the attenuator in accordance with the comparison of the output signal power level and the predetermined threshold.

Claims

1. A wireless transmitter system, said system comprising:

an outdoor unit configured to process an input signal having an associated input signal power level and generate an output signal having an associated output signal power level initially depending on said input signal power level; and

an indoor unit configured to generate said input signal and initialize said input signal power level such that said output signal power level is substantially equal to a predetermined threshold;

wherein, after said input signal power level is initialized, said outdoor unit independently controls said output signal power level using an attenuator in accordance with a comparison of said output signal power level and said predetermined threshold,

wherein said outdoor unit further comprises;

a detector for detecting said output signal power level of said transmitter; and

a processor for monitoring said output signal power level, and performing said comparison of said output signal power level to said predetermined threshold, and controlling said attenuator, and

wherein,

said outdoor unit is configured to generate one or more status signals, said status signals including data representing said input and output signal power levels; and

said processor is configured to monitor said status signals and generate a mute signal that mutes said output signal power level if any of said status signals indicates an error in said outdoor unit.

2. The system of claim 1, wherein said predetermined threshold is programmable.

3. The system of claim 1, wherein said processor generates said mute signal if said output signal power level is above said predetermined threshold after said attenuator is set to a maximum attenuation level.

4. The system of claim 1, wherein said outdoor unit further comprises an analog-to-digital converter for digitizing an output of said detector.

5. The system of claim 1, wherein said outdoor unit further comprises a second detector for detecting said input signal power level, said processor further monitoring said input signal power level.

6. The system of claim 1, wherein said system is incorporated in a two-way satellite communication system.

7. The system of claim 1, wherein said data is sent from said outdoor unit to said indoor unit via an interface circuit whereupon said indoor unit

8. The system of claim 7, wherein, if said data indicates that said output signal power level is substantially less than said predetermined threshold, said indoor unit reinitializes said input signal power level such that said output signal power level is substantially equal to said predetermined threshold. reinitializes said input signal power in accordance with said data.

9. The system of claim 1, wherein said outdoor unit comprises a temperature compensation circuit for stabilizing said output signal power level.

10. The system of claim 1, wherein said predetermined threshold is a maximum allowable output signal power level.

11. The system of claim 10, wherein said outdoor unit continuously maintains said output signal power level at said level substantially equal to said maximum allowable output signal power level.

12. The system of claim 11, wherein said maximum allowable output signal power level is two watts.

13. A method of controlling an output signal power level of an outdoor unit of a wireless transmitter, said method comprising:

initializing an input signal power level of an input signal to said outdoor unit with an indoor unit such that said output signal power level is substantially equal to a predetermined threshold;

independently controlling said output signal power level with an attenuator of said outdoor unit in accordance with a comparison of said output signal power level and said predetermined threshold;

detecting said output signal power level of said outdoor unit;

monitoring said output signal power level;

performing said comparison of said output signal power level to said predetermined threshold;

controlling said attenuator;

generating one or more status signals, said status signals including data representing said input and output signal power levels;

monitoring said status signals; and

muting said output signal power level if any of said status signals indicates an error in said outdoor unit.

14. The method of claim 13, further comprising programming said predetermined threshold.

15. The method of claim 13, further comprising muting said output signal power level if said output signal power level is above said predetermined threshold after said attenuator is set to a maximum attenuation level.

16. The method of claim 13, further comprising:

communicating said data from said outdoor unit to said indoor unit; and

reinitializing said input signal power in accordance with said data.

17. The method of claim 16, wherein, if said data indicates that said output signal power level is substantially less than said predetermined threshold, said step of reinitializing said input signal power level comprises reinitializing said input signal power level such that said output signal power level is substantially equal to said predetermined threshold.

18. The method of claim 13, further comprising compensating for temperature changes in said outdoor unit.

19. The method of claim 13, wherein said predetermined threshold is a maximum allowable output signal power level.

20. The method of claim 19, wherein said step of independently controlling said output signal power level comprises continuously maintaining said output signal power level at a level substantially equal to said maximum allowable output signal power level.

21. The method of claim 19, wherein said maximum allowable output signal power level is two watts.

22. A system for controlling an output signal power level of an outdoor unit of a wireless transmitter, said system comprising:

means for initializing an input signal power level of an input signal to said outdoor unit with an indoor unit such that said output signal power level is substantially equal to a predetermined threshold;

means for independently controlling said output signal power level with an attenuation means of said outdoor unit in accordance with a comparison of said output signal power level and said predetermined threshold;

detector means for detecting said output signal power level of said outdoor unit;

means for monitoring said output signal power level;

means for comparing said output signal power level to said predetermined threshold and controlling said attenuation means;

means for generating and monitoring one or more status signals, said status signals including data representing said input and output signal power levels; and

means for muting said output signal power level if any of said status signals indicates an error in said outdoor unit.

23. The system of claim 22, further comprising means for programming said predetermined threshold.

24. The system of claim 22, wherein said means for muting said output signal power level mutes said output signal power level if said output signal power level is above said predetermined threshold after said attenuation means is set to a maximum attenuation level.

25. The system of claim 22, further comprising

means for communicating said data from said outdoor unit to said indoor unit;

and

means for reinitializing said input signal power in accordance with said data

26. The system of claim 25, wherein, if said data indicates that said output signal power level is substantially less than said predetermined threshold, said means for reinitialize said input signal power level reinitializes said input signal power level such tat said output signal power level is substantially equal to said predetermined threshold.

27. The system of claim 22, further comprising means for compensating for temperature changes in said outdoor unit.

28. The system of claim 22, wherein said predetermined threshold is a maximum allowable output signal power level.

29. The system of claim 28, wherein said means for independently controlling said output signal power level comprises means for continuously maintaining said output signal power level at a level substantially equal to said maximum allowable output signal power level.

30. The system of claim 28, wherein said maximum allowable output signal power level is two watts.