Method and apparatus for intelligent noise reduction in a distributed communication system

• US 7,512,419 B2
• Filed: 04/21/2006
• Issued: 03/31/2009
• Est. Priority Date: 04/08/2002
• Status: Expired due to Term

• Current Assignee: CommScope Technologies, LLC (CommScope Holding Company, Inc.)
• Original Assignee: ADC Telecommunications Incorporated (TE Connectivity Limited)
• Inventors: Solum, Jeff
• Primary Examiner(s): Nguyen; Lee
• Application Number:
  US11/379,702
• Publication Number:
  US 20060183420A1
• Time in Patent Office: 1,075 Days
• Field of Search: 455132-140, 455272-273, 4552771-2772, 455/278.1, 455/63.1, 455/562.1, 375/347
• US Class Current: 455/562.1
• CPC Class Codes: H04B 7/0837 using pre-detection combining H04B7/0868 takes precedence
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity

Abstract

A wireless distribution system includes a number of remote units distributed in a coverage area to receive wireless signals and to provide the signals through the distribution system to input ports of an expansion unit where the signals are combined, detectors operatively connected to one or more of the plurality of input ports to determine the presence of information carrying signals at the input ports, a number of selection circuits to select signals in which information has been detected, and a node to combine the selected signals.

Claims

1. A wireless distribution system, comprising:

a plurality of remote units distributed in a coverage area to receive wireless signals; and

at least one expansion unit adapted to receive signals comprising the wireless signals

from the plurality of remote units, the at least one expansion unit comprising;

a plurality of input ports to receive the signals comprising the wireless signals from the plurality of remote units;

at least one detection circuit operatively coupled to one or more of the plurality of input ports to detect the presence of information carrying signals at the plurality of input ports; and

a plurality of switches operatively coupled to the at least one detection circuit and the plurality of input ports to individually switch online each input port at which the at least one detection circuit detects the presence of information carrying signals and to individually switch offline each input port at which the at least one detection circuit does not detect the presence of information carrying signals.

2. The wireless distribution system of claim 1, wherein the signals received at the plurality of input ports comprise one of analog and digital signals.

3. The wireless distribution system of claim 1, wherein the wireless signals received at the plurality of remote units comprise one of analog and digital signals.

4. The wireless distribution system of claim 1, wherein the at least one detection circuit further comprises a plurality of detectors adapted to determine whether the levels of signals received at each input port match a pattern that is characteristic of information carrying signals.

5. The wireless distribution system of claim 1, wherein the at least one detection circuit further comprises a controller adapted to process signals received at each of the plurality of input ports to detect the presence of information carrying signals.

6. The wireless distribution system of claim 5, wherein the controller is adapted to scan a radio frequency spectrum of interest on the signals at each input port to detect the presence of information carrying signals.

7. The wireless distribution system of claim 1, wherein the at least one expansion unit further comprises:

a summing junction operatively coupled to the plurality of input ports to combine the signals of the online input ports.

8. The wireless distribution system of claim 1, further comprising:

at least one host unit coupled to the at least one expansion unit to receive combined signals from the at least one expansion unit, the at least one host unit comprising;

a plurality of input ports to receive signals from the at least one expansion unit; and

a wireless interface device to interface with a wireless network for transmission of the signals received from the at least one expansion unit over the wireless network.

9. The wireless distribution system of claim 8, wherein the at least one host unit further comprises:

at least one detection circuit operatively coupled to one or more of the plurality of input ports to detect the presence of information carrying signals at the plurality of input ports;

a plurality of switches operatively coupled to the at least one detection circuit and the plurality of input ports to individually switch offline each input port at which the at least one detection circuit does not detect the presence of information carrying signals and to individually switch online each input port at which the at least one detection circuit detects the presence of information carrying signals; and

a summing junction operatively coupled to the plurality of input ports to combine the signals received at the online input ports.

10. The wireless distribution system of claim 9, wherein the at least one host unit is further coupled to one or more of the plurality of remote units to receive signals comprising the wireless signals from the one or more remote units.

11. The wireless distribution system of claim 1, wherein the at least one expansion unit further comprises a plurality of expansion units, each expansion unit coupled to one or more of the plurality of remote units to receive signals comprising the wireless signals, at least one of the plurality of expansion units being further coupled to one or more other expansion units to receive signals combined at the one or more other expansion units.

12. A method of controlling the signal levels of a wireless distribution system, the method comprising:

receiving wireless signals at a plurality of remote units distributed in a coverage area;

transmitting signals comprising the wireless signals from the remote units to a plurality of input ports in at least one expansion unit;

detecting the presence of information carrying signals at the plurality of input ports;

switching offline each input port at which the presence of information carrying signals is not detected; and

switching online each input port at which the presence of information carrying signals is detected.

13. The method of claim 12, wherein detecting the presence of information carrying signals at the input ports further comprises:

comparing each signal received at the plurality of input ports with a noise floor threshold;

determining that signals above the noise floor threshold are information carrying signals; and

determining that signals below the noise floor threshold are not information carrying signals.

14. The method of claim 12, wherein detecting the presence of information carrying signals at the input ports further comprises:

scanning a radio frequency spectrum of interest of signals at each input port to look for the presence of information carrying signals.

15. The method of claim 12, wherein receiving wireless signals at a plurality of remote units further comprises receiving one of analog wireless signals and digital wireless signals.

16. The method of claim 12, further comprising:

combining the signals received at the online input ports.

17. The method of claim 16, further comprising:

transmitting the combined signals to at least one of another expansion unit and a host unit.

18. The method of claim 17, further comprising:

receiving signals from the host unit at the at least one expansion unit;

splitting the signals received from the host unit; and

transmitting the split signals to the plurality of remote units.

19. An expansion unit comprising:

means for determining which signals received from a plurality of remote units are information carrying signals;

means for switching online each signal determined to be an information carrying signal and for switching offline each signal determined to not be an information carrying signal; and

means for combining the signals determined to be information carrying signals.

20. The expansion unit of claim 19, further comprising:

means for transmitting the combined signals to a host unit; and

means for splitting signals received from the host unit.

21. A wireless distribution system, comprising:

a plurality of remote units distributed in a coverage area to receive wireless signals;

a plurality of input ports to receive signals comprising the wireless signals provided by the plurality of remote units, wherein the signals received at the input ports comprise a frequency spectrum that is digitized for distribution over the wireless distribution system;

a plurality of detectors operatively connected to one or more of the plurality of input ports to determine the presence or absence of information carrying signals at the input ports;

a plurality of switches to select one or more of the signals received at the plurality of input ports in response to signals from one or more of the plurality of detectors; and

a node to combine the signals selected from the plurality of input ports.