Systems and Methods for Impulse Noise Characterization
AssigneeConexant Systems, Inc.
InventorsHemant Samdani, Kunal Raheja, Rahul Garg, Amitkumar Mahadevan, Patrick Duvaut
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Abstract
Impulse noise from nearby or intense electrical sources can disrupt communications over digital subscriber lines (DSL). The characterization of the nature, timing and length of impulse noise sources present on a DSL loop is a critical first step in mitigating the effect of impulse noise on DSL communications. DSL standards provide histograms for impulse length and inter-arrival time of impulses. These histograms can be used to derive the nature, maximum frequency and other statistics related to impulse noise on a DSL line.
Claims34
An impulse noise monitoring system comprising:
- an impulse length analysis engine, wherein the impulse length analysis engine is configured to:
- calculate a net INMAINPEQ histogram having histogram primitives INMAINPEQi over an observation window, where i is taken from a range comprising integers from one to a maximum value.
- detect a periodic impulse noise source of impulse length j by determining whether the histogram primitive INMAINPEQj is greater than a predetermined threshold and j is less than the maximum value;
- and
- detect a noise source of impulse length equal to or greater than the maximum value by determining whether the histogram primitive INMAINPEQm is greater than the predetermined threshold where m is the maximum value;
An impulse noise monitoring system comprising an inter-arrival time (IAT) engine, wherein the IAT analysis engine is configured to:
- calculate a net INMAIAT histogram having histogram primitives INMAIATi over an observation window, for i=1 to a first maximum value, based on optimally selected INMIATO and INMIATS parameters.
A method for extracting statistics from a INMAINPEQ histogram and a INMAIAT histogram comprising:
- calculating a net INMAINPEQ histogram having histogram primitives INMAINPEQi over an observation window, where i is taken from a range comprising integers from one to a first maximum value;.
- detecting a periodic impulse noise source of impulse length j by determining whether the histogram primitive INMAINPEQj is greater than a first predetermined threshold and j is less than the first maximum value;
- and
- detecting an impulse noise source of impulse length equal to or greater than the first maximum value by determining whether the histogram primitive INMAINPEQm is greater than the first predetermined threshold where m is the maximum value.
An impulse noise monitoring system comprising:
- a means for analyzing impulse length;
- a means for analyzing IAT;
- and
- a means for combining results produced by the means for analyzing impulse length and the means for analyzing IAT.
Dependencies are inferred from the claim text.