Cooperative MIMO for alien noise cancellation (COMAC) for upstream VDSL systems
AssigneeIkanos Communications, Inc.
InventorsPravesh Biyani, Amitkumar Mahadevan, Patrick Duvaut
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Abstract
Included are embodiments for reducing alien crosstalk. At least one embodiment of a method includes receiving noise data associated with a first user signal on a first tone, receiving noise data associated with a second user signal on the first tone, and receiving at least one alien crosstalk canceller coefficient for the first user on the first tone. Some embodiments include applying the at least one alien crosstalk canceller coefficient to the second user signal to reduce alien crosstalk for the first user signal.
Claims25
A method in a digital subscriber line (DSL) system, the method comprising:
- receiving alien noise data associated with a first user signal on a first tone;
- receiving alien noise data associated with a second user signal on the first tone;
- receiving at least one alien crosstalk canceller coefficient for the first user signal on the first tone, wherein the at least one alien crosstalk canceller coefficient is associated with alien noise originated from a service different from the DSL system;
- and
- applying the at least one alien crosstalk canceller coefficient to the second user signal to reduce alien crosstalk for the first user signal based on the existing correlation between the first user signal on the first tone and the second user signal on the first tone.
A digital subscriber line (DSL) system, comprising:
- a first receiving component configured to receive alien noise data associated with a first user signal on a first tone;
- a second receiving component configured to receive alien noise data associated with a second user signal on the first tone;
- a third receiving component configured to receive at least one alien crosstalk canceller coefficient for the first user signal on the first tone, wherein the at least one alien crosstalk canceller coefficient is associated with alien noise originated from a service different from the DSL system;
- an applying component configured to apply the at least one alien crosstalk canceller coefficient to the second user signal to compute a correction signal for the first user;
- and
- a reducing component configured to combine the correction signal for the first user and the first user signal to reduce alien crosstalk into the first user signal based on the existing correlation between the first user signal on the first tone and the second user signal on the first tone.
A digital subscriber line (DSL) system, comprising:
- means for receiving alien noise data associated with a first user signal on a first tone;
- means for receiving alien noise data associated with a second user signal on the first tone;
- means for receiving at least one alien crosstalk canceller coefficient for the first user signal on the first tone, wherein the at least one alien crosstalk canceller coefficient is associated with alien noise originated from a service different from the DSL system;
- and
- means for applying the at least one alien crosstalk canceller coefficient to the second user signal to reduce alien crosstalk into the first user signal based on the existing correlation between the first user signal on the first tone and the second user signal on the first tone.
Dependencies are inferred from the claim text.