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US 7,627,026 B2Granted
Threshold setting using piecewise linear approximation for channel diagnostic systems
AssigneeBroadcom Corporation
InventorsPeiqing Wang, Scott R. Powell
Life of this patent
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Abstract
A method and apparatus for detecting faults in cables. The invention comprises computing a plurality of thresholds representing a corresponding plurality of values of reflections in the cable; comparing a received reflection to a given threshold; if the received reflection value is greater than the given threshold value, then determining the location of the cable fault; and if the received reflection is not greater than the given threshold value, then taking no further action.
Claims18
A method for detecting the location of a fault in a cable, comprising:
- a) transmitting a signal on the cable;
- b) receiving a reflected signal from the cable;
- c) converging a plurality of echo canceller coefficients based on the reflected signal, wherein each echo canceller coefficient corresponds to a respective tap of a plurality of taps of an echo canceller;
- d) determining a threshold of a given tap of the plurality of taps using a piecewise linear function of a tap number associated with the given tap;
- e) comparing the threshold of the given tap to a value of a corresponding echo canceller coefficient;
- f) if the value of the corresponding echo canceller coefficient is greater than the threshold of the given tap, then determining a location of a cable fault based on the tap number associated with the given tap;
- and
- g) performing steps d)-f) for each remaining tap of the plurality of taps.
5 more elements
A method for detecting the location of a fault in a cable, comprising:
- a) transmitting a first signal on the cable;
- b) converging a plurality of echo canceller coefficients based on a first reflected signal received from the cable, wherein each echo canceller coefficient corresponds to a respective tap of a plurality of taps of an echo canceller;
- c) determining a threshold of a given tap of the plurality of taps using a first piecewise linear function of a tap number associated with the given tap;
- d) when the threshold of the given tap is greater than a value of a corresponding echo canceller coefficient, then determining a location of a cable fault based on the tap number associated with the given tap;
- and
- e) when the threshold of the given tap is not greater than the value of the corresponding echo canceller coefficient, then
- (1) converging a plurality of second echo canceller coefficients based on a second reflected signal received from the cable, wherein each second echo canceller coefficient corresponds to a respective tap of the plurality of taps of the echo canceller,
- (2) determining a second threshold of the given tap using a second piecewise linear function of the tap number associated with the given tap,
- (3) when the second threshold of the given tap is greater than a value of a corresponding second echo canceller coefficient, then determining a location of a cable fault based on a tap number associated with the given tap.
6 more elements
An apparatus for detecting a location of a fault in a cable, comprising:
- means for receiving a reflected signal from the cable;
- means for converging a plurality of coefficients based on the reflected signal, wherein each coefficient of the plurality of coefficients corresponds to a respective tap of a plurality of taps;
- means for determining a plurality of thresholds using a piecewise linear function of a tap number, wherein each threshold is determined based on a tap number of the respective tap of the plurality of taps;
- means for comparing a threshold of the plurality of thresholds to a coefficient of the plurality of coefficients, wherein the threshold was determined based on a tap number of the respective tap corresponding to the coefficient;
- and
- means for determining a cable fault location based on a tap number of a given tap of the plurality of taps when the threshold corresponding to the given tap is greater than the coefficient corresponding to the given tap.
3 more elements
Dependencies are inferred from the claim text.