Upstream bandwidth conditioning device

• US 8,479,247 B2
• Filed: 04/14/2010
• Issued: 07/02/2013
• Est. Priority Date: 04/14/2010
• Status: Active Grant

• Current Assignee: PPC Broadband Incorporated (Belden Inc.)
• Original Assignee: PPC Broadband Incorporated (Belden Inc.)
• Inventors: Shafer, Steven K.
• Primary Examiner(s): SHEPARD, JUSTIN E
• Application Number:
  US12/760,153
• Publication Number:
  US 20110258677A1
• Time in Patent Office: 1,175 Days
• Field of Search: 725/124
• US Class Current: 725/124
• CPC Class Codes: H04B 3/36 Repeater circuits H04B3/58 takes precedence
• CPC Class Codes: H04N 21/6118 involving cable transmission, e.g. using a cable modem
• CPC Class Codes: H04N 21/6168 involving cable transmission, e.g. using a cable modem

Abstract

A device may be used for conditioning an upstream bandwidth. The device can include a return path extending at least a portion of a distance between a supplier side connector and a user side connector, and a coupler connected within the return path, the coupler providing a secondary path. An offset or noise detection circuit is connected electrically downstream the coupler. A microprocessor is connected to the detection circuit. A variable signal level adjustment device is connected within the return path. The variable signal level adjustment device can be controlled by the microprocessor responsive to a detected offset level or noise floor in the return path.

Claims

1. A device for conditioning an upstream bandwidth, the device comprising:

a return path extending at least a portion of a distance between a supplier side connector and a user side connector;

a coupler connected within the return path, wherein the coupler passes a portion of the upstream bandwidth to a secondary path;

a splitter circuit connected electrically downstream from the coupler;

a noise floor detector connected electrically downstream from the splitter;

a level detector connected electrically downstream from the splitter circuit;

a variable signal level adjustment device connected within the return path electrically downstream from the coupler; and

a microprocessor connected electrically downstream of the noise floor detector, the microprocessor configured to use the detected noise floor to control the variable signal level adjustment device.

2. The conditioning device of claim 1, wherein the noise floor detector comprises a detector circuit and a first band pass filter passing a signal bandwidth outside a supplier upstream bandwidth and a supplier downstream bandwidth and a detector circuit coupled connected electrically downstream from the first band pass filter.

3. The conditioning device of claim 2, the first band pass filter to pass a signal below 5 MHz, between 42 MHz-55 MHz, or between 85 MHz-108 MHz.

4. The conditioning device of claim 1, wherein the noise floor detector comprises a band pass filter, a detector, and a peak detector coupled in series connected electrically downstream of the coupler.

5. The conditioning device of claim 1 further comprising a level detector connected electrically downstream from the splitter and electrically upstream from the microprocessor, the level detector to provide an upstream information signal level to the microprocessor.

6. The conditioning device of claim 5, wherein the noise floor detector comprises a band pass filter, a detector, and a peak detector coupled in series connected electrically downstream of the coupler.

7. The conditioning device of claim 1, where the microprocessor compares a ratio of a noise floor signal and a carrier signal to set a control signal to the variable signal level adjustment device.

8. The conditioning device of claim 7, where the microprocessor comprises digital circuit components or analog circuit components.

9. The conditioning device of claim 1, the microprocessor to determine selected decibel levels and compression types CNR using a compression rate among a plurality of compression rates according to a difference between levels of the carrier signal and the noise floor signal or a selection CNR.

10. The conditioning device of claim 1, wherein the coupler is connected electrically in a user side main path between a user side diplexer filter and a user side connector.

11. A method for conditioning a downstream bandwidth on a premise of a user of CATV services, the method comprising:

receiving a upstream bandwidth from a user side connector;

passing a portion of the upstream bandwidth through first and second different passive filters to obtain an upstream signal level and at least one offset signal level;

measuring a signal strength of the upstream signal level and a signal strength of the at least one offset signal level;

comparing a ratio of the upstream signal level strength and the at least one offset signal level strength to a first predetermined signal strength ratio to output a first compensation amount;

dividing the upstream bandwidth and the downstream bandwidth from a user side connector; and

adjusting the divided upstream bandwidth by a variable amount of signal level adjustment responsive to the first compensation value.

12. The method of claim 11, where a bandwidth for the upstream signal level and a bandwidth for the at least one offset signal level are different size bandwidths, where the at least one offset signal level bandwidth is 42-55 MHz or less than 5 MHz.

13. The method of claim 11, where the first predetermined signal strength ratio corresponds to at least 15 dB difference, at least 21 dB difference, at least 27 dB difference, at least 33 dB difference between upstream signal level strength and the at least one offset signal level strength.

14. The method claim 13, wherein an upstream compression rate uses QPSK, 16 QAM, 64 QAM, 256 QAM according to a level of the first predetermined signal ratio.

15. The method of claim 11, wherein the adjusting the upstream bandwidth is repeatedly performed or continuously performed.

16. The method of claim 11, wherein adjusting the divided upstream bandwidth comprises:

adding an increment of attenuation to the divided upstream bandwidth or;

reducing the increment of attenuation from the divided upstream bandwidth, further comprising reducing the increment of attenuation to the upstream bandwidth when a predetermined time has elapsed since a completion of a previous step of adjusting the divided upstream bandwidth.

17. A device for conditioning an upstream bandwidth, the device comprising:

a return path extending at least a portion of a distance between a supplier side and a user side connector;

a first portion of the return path extending between a user side diplexer filter and a supplier side diplexer filter;

a coupler connected outside the first portion of the return path, the coupler providing a secondary path, wherein the coupler passes a portion of the upstream bandwidth to the secondary path;

a splitter circuit connected electrically downstream the coupler;

an offset level detector connected electrically downstream of the splitter;

a signal level detector connected electrically downstream the splitter circuit;

a microprocessor connected electrically downstream the offset detector and the level detector; and

a variable signal level adjustment device connected within the first portion of the return path electrically downstream from the coupler, the variable signal level adjustment device being controlled by the microprocessor in accordance with an offset level detector outside the first portion of the return path.

18. The conditioning device of claim 17, wherein the offset detector and the signal level detector comprises a band pass filter, a detector, and a peak detector coupled in series connected electrically downstream of the splitter, where the band pass filter for the offset level detector passes a signal bandwidth outside a supplier upstream bandwidth and a supplier downstream bandwidth.

19. The conditioning device of claim 17, where the microprocessor compares a ratio of the offset level and a signal level to change an amount of signal level adjustment for the variable signal level adjustment device.

20. A device for conditioning an upstream bandwidth, the device comprising:

a return path extending at least a portion of a distance between a supplier side connector and a user side connector;

a coupler connected within the return path, wherein the coupler passes a portion of the upstream bandwidth to a secondary path;

a radio frequency detection circuit connected within the secondary path electrically downstream from the coupler;

a level detector connected within the secondary path electrically downstream from the radio frequency detection circuit;

a variable signal level adjustment device connected within the return path electrically downstream from the level detector; and

a microprocessor connected electrically downstream of the radio frequency detection circuit, the microprocessor configured to use a detected noise floor to control the variable signal level adjustment device.

21. The conditioning device of claim 20, wherein the secondary path further comprises a high-pass filter connected within the secondary path downstream from the coupler.

22. The conditioning device of claim 21, wherein the radio-frequency detection circuit comprises:

a radio-frequency amplifier;

a radio-frequency detector; and

a low-pass amplifier.