Method and system for detecting impulse noise in a broadband communication system

• US 7,953,144 B2
• Filed: 09/25/2007
• Issued: 05/31/2011
• Est. Priority Date: 09/25/2006
• Status: Active Grant

• Current Assignee: ARRIS Enterprises LLC (CommScope Holding Company, Inc.)
• Original Assignee: ARRIS Group, Inc. (CommScope Holding Company, Inc.)
• Inventors: Allen, Jim, Cloonan, Tom
• Primary Examiner(s): Odom; Curtis B
• Application Number:
  US11/861,263
• Publication Number:
  US 20080075157A1
• Time in Patent Office: 1,344 Days
• Field of Search: 375/227, 375346-350
• US Class Current: 375/227
• CPC Class Codes: H04B 17/345 Interference values signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] H04B17/336

Abstract

A method halts transmission and/or reception of a desired signal on a channel in a communication network and samples an analog metric versus time on the channel at a predetermined sample rate. Successively sampled sets of data are stored first to a one dimensional array, each of which set is then stored to a two-dimensional array. The two dimensional array is analyzed in the time domain to determine the presence of impulse noise. Analog parameters represented by values contained in the samples can be analyzed to determine where, with respect to time, impulse noise occurs, and what is the amplitude of the impulse noise as well as AWGN.

Claims

1. A method for collecting time-domain data to be used for detecting presence of impulse noise on a communication system channel, comprising:

creating a measurement interval during which no data signal can be transmitted on the channel;

acquiring voltage samples at a predetermined sample rate;

bandpass filtering the acquired voltage samples; and

storing the bandpass filtered samples to a working memory as elements of a one-dimensional array.

2. The method of claim 1, wherein voltage samples are acquired during a predetermined number of measurement intervals and the samples acquired during each measurement interval are stored to corresponding one-dimensional arrays, further comprising:

for each of the multiple one dimensional arrays, moving the contents of said one-dimensional array to a secondary storage memory before data is acquired for the next successive one-dimensional array, wherein the contents of the multiple one-dimensional arrays are stored as a two-dimensional array.

3. A method for detecting the presence of impulse noise in a channel of a communication system, comprising:

collecting digital data samples of impulse noise from the communication channel;

storing to a memory the digital data samples as a two-dimensional array having a plurality of columns and rows;

plotting each of the rows of the two dimensional array as an analog metric versus time plot; and

analyzing the plot for spikes in amplitude of the analog metric.

4. The method of claim 3 wherein the analog metric is voltage of the channel.

5. The method of claim 3 wherein the analog metric is instantaneous power of the channel.

6. The method of claim 5 where in the instantaneous power is plotted on a logarithmic scale.

7. The method of claim 3 wherein the step of analyzing is performed by a computer.

8. The method of claim 3 wherein the step of analyzing includes identifying regions on the instantaneous power plots where the power is low compared to other regions where the power is significantly higher and deeming that the lower regions represent AWGN noise regions and deeming that the higher regions represent the AWGN/burst noise regions.

9. A method for determining specific parameters associated with samples of noise information of signals on a communication channel that are acquired during a predetermined number of measurement intervals that are contained in a two dimensional array, comprising:

analyzing an analog parameter of the samples of each row of data in the two-dimensional array with respect to time to determine which samples correspond to the one or more of the specific parameters;

identifying one or more instances of impulse noise in the samples based on the analysis; and

calculating values for the specific parameters based on the analysis of the analog parameters with respect to time.

10. The method of claim 9 wherein the analysis includes plotting the samples and visually analyzing the data.

11. The method of claim 9 where a measurement of a maximum value for the analog parameter represents an impulse noise signal.

12. The method of claim 9 wherein a measurement of a minimum value for the analog parameter represents AWGN.

13. The method of claim 9 wherein the analog parameter is voltage.

14. The method of claim 9 wherein the analog parameter is instantaneous power.