Muting systems and methods for communication transceivers

• US 6,363,241 B1
• Filed: 04/13/2000
• Issued: 03/26/2002
• Est. Priority Date: 04/13/2000
• Status: Expired due to Term

• Current Assignee: CalAmp Corporation
• Original Assignee: California Amplifier Inc.
• Inventors: Ponti, John L., Briceno, Carlos, Barakat, Nader A.
• Primary Examiner(s): Kincaid, Lester G.
• Application Number:
  US09/549,316
• Time in Patent Office: 712 Days
• Field of Search: 455/3.05, 455/78, 455/79, 455/82, 455/83, 455/115, 455/116, 455/127, 455/63, 455/67.3, 455/67.1, 455/68, 455/522, 455/572, 455/574, 375/219
• US Class Current: 455/63.1
• CPC Class Codes: H03G 3/341 Muting when no signals or only weak signals are present H03G3/344, H03G3/345 take precedence
• CPC Class Codes: H04B 1/38 Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving

Abstract

Muting systems and methods are described that reduce noise signals that are received in a communication hub which communicates with indoor units (IDUs) of a plurality of communication customers. The systems and methods reduce transmitter signal gain when uplink communication signals to the transmitter input port are less than a predetermined threshold. Accordingly, accumulated noise signals at the communication hub are reduced and the system performance of the communication hub is not degraded.

Claims

1. A transceiver system for reduction of noise signals that are received in a communication hub which communicates with indoor units (IDUs) of a plurality of communication customers, the system comprising:

a transceiver having a receiver and a transmitter and wherein;

a) said receiver couples downlink communication signals from said communication hub to a respective one of said IDUs; and

b) said transmitter converts, with a signal gain, uplink communication signals from said respective IDU to upconverted uplink communication signals and couples said upconverted uplink communication signals to said communication hub; and

a muting system that reduces said signal gain when said uplink communication signals have an amplitude less than a predetermined threshold;

reduction of said gain thereby facilitating said reduction of noise signals.

2. The transceiver system of claim 1, wherein said muting system includes a comparator that compares said uplink communication signals to said threshold and said muting system reduces said signal gain in response to said comparator.

3. The transceiver system of claim 1, wherein said muting system reduces said signal gain in response to a gain-control signal from said IDU.

4. The transceiver system of claim 1, wherein said transmitter includes an amplifier element and said muting system is configured to reduce gain in said amplifier element.

5. The transceiver system of claim 1, wherein said transmitter includes an attenuator element and said muting system is configured to increase loss in said attenuator element.

6. The transceiver system of claim 1, wherein said transmitter includes an amplifier element and said muting system is configured to remove supply power from said amplifier element.

7. The transceiver system of claim 1, wherein said transmitter reduces said signal gain in response to a mute signal and said muting system includes:

a detector that generates a detected signal in response to said uplink communication signals; and

a comparator that generates said mute signal in response to said detected signal and a predetermined threshold signal S_thld and wherein said comparator couples said mute signal to said transmitter.

8. The transceiver system of claim 7, wherein said transmitter includes a signal coupler that couples a sample of said uplink communication signals to said detector.

9. The transceiver system of claim 1, wherein said muting system reduces said signal gain in response to a gain-control signal from said IDU and said transmitter includes a signal coupler that couples said gain-control signal to said muting system.

10. The transceiver system of claim 1, wherein said muting system and said transmitter are configured to reduce said signal gain greater than 30 decibels.

11. The transceiver system of claim 1, wherein said muting system and said transmitter are configured to reduce said signal gain greater than 45 decibels.

12. A communication system, comprising:

a communication hub;

plurality of indoor units (IDUs);

a transceiver associated with each respective one of said IDUs, said transceiver having a transmitter and a receiver wherein;

a) said receiver couples downlink communication signals from said communication hub to said respective IDU; and

b) said transmitter converts, with a signal gain, uplink communication signals from said respective IDU to upconverted communication signals and couples said upconverted communication signals to said communication hub; and

a muting system in said transceiver that reduces said signal gain when said uplink communication signals have an amplitude less than a predetermined threshold;

reduction of said gain thereby facilitating said reduction of noise signals.

13. The communication system of claim 12 wherein said muting system includes a comparator that compares said uplink communication signals to said threshold and said muting system reduces said signal gain in response to said comparator.

14. The communication system of claim 12 wherein said muting system reduces said signal gain in response to gain-control signal from said IDU.

15. The communication system of claim 12, wherein said transmitter includes an amplifier element and said muting system is configured to reduce gain in said amplifier element.

16. The communication system of claim 12 wherein said transmitter includes an attenuator element and said muting system is configured to increase loss in said attenuator element.

17. The communication system of claim 12, wherein said transmitter includes an amplifier element and said muting system is configured to remove supply power from said amplifier element.

18. The communication system of claim 12, wherein said muting system and said transmitter are configured to reduce said signal gain greater than 30 decibels.

19. The communication system of claim 12, wherein said muting system and said transmitter are configured to reduce said signal gain greater than 45 decibels.

20. A method for reducing noise signals that are received in a communication hub which communicates with indoor units (IDUs) of a plurality of communication customers, the method comprising the steps of;

coupling downlink communication signals from said communication hub to said IDUs;

with a respective signal gain, converting uplink communication signals from each of said IDUs to upconverted uplink communication signals;

coupling said upconverted uplink communication signals to said communication hub; and

reducing said signal gain when said uplink communication signals have an amplitude less than a predetermined threshold;

said reduction of noise signals facilitated by reduction of said signal gain.

21. The method of claim 20, further including the steps of:

comparing said uplink communication signals to said predetermined threshold to sense when said uplink communication signals have an amplitude less than said threshold; and

reducing said signal gain in response to said comparing step.

22. The method of claim 20, further including the steps of:

from each of said IDUs, providing a gain-control signal when said uplink communication signals have an amplitude less than said threshold; and

reducing said signal gain in response to said gain-control signal.

23. The method of claim 20, wherein said reducing step includes the step of decreasing gain in an amplifier element of said transceiver.

24. The method of claim 20, wherein said reducing step includes the step of removing supply power from an amplifier element of said transceiver.

25. The method of claim 20, wherein said reducing step includes the step of increasing loss in an attenuator element of said transceiver.

26. The method of claim 20, wherein said reducing step includes the step of decreasing said signal gain by more than 30 decibels.

27. The method of claim 20, wherein said reducing step includes the step of decreasing said signal gain by more than 45 decibels.