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US 8,428,192 B2Granted
Adaptive interference canceling system and method
AssigneeAdtran, Inc.
InventorsAyman Ghobrial, Michael D. Turner, Daniel M. Joffe
Life of this patent
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Abstract
A communication system adaptively cancels noise and/or interference from signals communicated through a communication channel, such as signals communicated by a telecommunication network. The system, based on a common mode signal of a received signal, generates an estimate of noise or interference within a differential mode signal of the received signal. The system then subtracts the estimate from the differential mode signal in an effort to remove noise from the differential mode signal thereby providing a differential mode signal that is substantially free of the estimated noise or interference.
Claims11
An apparatus for adaptively canceling interference from communication signals, comprising:
- a sampling element configured to receive a data signal from a first communication connection and a second communication connection of a telecommunication line coupled to the sampling element, the sampling element configured to separate the data signal into a differential mode signal and a common mode signal, wherein the differential mode signal represents a difference between a first voltage of the first communication connection and a second voltage of the second communication connection, and wherein the common mode signal represents a sum of the first and second voltages;
- a first domain conversion element configured to receive the differential mode signal and to convert the differential mode signal from time domain to frequency domain;
- a second domain conversion element configured to receive the common mode signal and to convert the common mode signal from time domain to frequency domain;
- and
- an adaptive interference canceler configured to receive the common mode signal in the frequency domain and to provide, based on the common mode signal in the frequency domain, an estimate of interference within the differential mode signal in the frequency domain, the adaptive interference canceler further configured to combine the estimate with the differential mode signal in the frequency domain, thereby reducing interference in the differential mode signal.
2 more elements
An apparatus for adaptively canceling interference from communication signals, comprising:
- a sampling element coupled to a first communication connection of a telecommunication line and a second communication connection of the telecommunication line, the sampling element configured to separate a signal received from the first and second communication connections into a differential mode signal and a common mode signal, wherein the differential mode signal represents a difference between a first voltage of the first communication connection and a second voltage of the second communication connection, and wherein the common mode signal represents a sum of the first and second voltages;
- a first domain conversion element configured to receive the differential mode signal and to convert the differential mode signal from time domain to frequency domain;
- a second domain conversion element configured to receive the common mode signal and to convert the common mode signal from time domain to frequency domain;
- and
- an adaptive interference canceler configured to adaptively filter the common mode signal in the frequency domain thereby providing a filtered signal indicative of an estimate of interference within the differential mode signal, the adaptive interference canceler configured to combine the differential mode signal in the frequency domain and the filtered signal, thereby removing interference from the differential mode signal.
2 more elements
A method for adaptively canceling interference from communication signals, comprising:
- receiving a signal from a first communication connection of a telecommunication line and a second communication connection of the telecommunication line;
- separating the received signal into a differential mode signal and a common mode signal, wherein the differential mode signal represents a difference between a first voltage of the first communication connection and a second voltage of the second communication connection, and wherein the common mode signal represents a sum of the first and second voltages;
- converting the differential mode signal from time domain to frequency domain;
- converting the common mode signal from time domain to frequency domain;
- estimating, based on the common mode signal in the frequency domain, interference within the differential mode signal in the frequency domain;
- and
- combining the estimated interference with the differential mode signal in the frequency domain, thereby reducing interference in the differential mode signal.
4 more elements
A method for adaptively canceling interference from communication signals, comprising:
- receiving a signal from a communication channel;
- separating the received signal into a differential mode signal and a common mode signal;
- converting the differential mode signal from time domain to frequency domain;
- converting the common mode signal from time domain to frequency domain;
- estimating, based on the common mode signal in the frequency domain, interference within the differential mode signal in the frequency domain, wherein the estimating comprises adaptively filtering the common mode signal in the frequency domain thereby providing a filtered signal indicative of the estimated interference;
- and
- subtracting the filtered signal from the differential mode signal in the frequency domain, thereby reducing interference in the differential mode signal.
4 more elements
Dependencies are inferred from the claim text.