Method and apparatus for crosstalk channel estimation
AssigneeHuawei Technologies Co., Ltd.
InventorsLiming Fang, Raphael Cendrillon
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Abstract
A method and apparatus for crosstalk channel estimation based on a measured signal-to-noise (SNR) of a loaded line. The method for channel estimation includes: loading, on a newly added line K, a combination of K-1 signals sent on lines 1 to K-1; obtaining a measured SNR of the line K loaded with the combination of the K-1 signals sent on the lines 1 to K-1; and calculating crosstalk channels of the line K according to K-1 coefficients of the K-1 signals sent on the lines 1 to K-1 and the measured SNR. Embodiments of the present invention may be used for relevant network communications systems such as xDSL systems.
Claims26
A method for crosstalk channel estimation, comprising:
- loading, on a newly added line K, a combination of K-1 signals sent on lines 1 to K-1,
- obtaining a measured signal-to-noise ratio (SNR) of the line K loaded with the combination of the K-1 signals sent on the lines 1 to K-1, and
- calculating crosstalk channels of the line K according to K-1 coefficients of the K-1 signals sent on the lines 1 to K-1 and the measured SNR;
- wherein the step of loading the combination of the K-1 signals sent on lines 1 to K-1 comprises:
- loading the combination of the K-1 signals sent on lines 1 to K-1 according to a formula:
- x
- K
- (
- n
- )
-
- (
- l
- )
- =
- s
- K
- (
- n
- )
-
- (
- l
- )
- +
- ɛ
-
- ∑
- i
- =
- 1
- K
- -
- 1
-
- z
- i
- (
- n
- )
-
- s
- i
- (
- n
- )
-
- (
- l
- )
- ,
- wherein ε indicates a step;
- zi(n) indicates a coefficient of line i during SNR measurement n;
- si(n)(l) denotes a signal to be sent on symbol 1 of line i during SNR measurement n;
- and xK(n)(l) denotes a signal actually sent on the line K.
An apparatus, comprising:
- a transceiver configured to:
- load, on a newly added line K, a combination of K-1 signals sent on lines 1 to K-1;
- obtain a measured signal-to-noise ratio (SNR) of the line K loaded with the combination of the K-1 signals sent on the lines 1 to K-1;
- and
- calculate crosstalk channels of the line K according to K-1 coefficients of the K-1 signals sent on the line 1 to the line K-1 and the measured SNR;
- wherein the transceiver is further configured to load on the line K the combination of K-1 signals sent on lines 1 to K-1 by a formula:
- x
- K
- (
- n
- )
-
- (
- l
- )
- =
- s
- K
- (
- n
- )
-
- (
- l
- )
- +
- ɛ
-
- ∑
- i
- =
- 1
- K
- -
- 1
-
- z
- i
- (
- n
- )
-
- s
- i
- (
- n
- )
-
- (
- l
- )
- ,
- wherein ε indicates a step;
- zi(n) indicates a coefficient of line i during SNR measurement n;
- si(n)(l) denotes a signal to be sent on symbol 1 of line i during SNR measurement n;
- and xK(n)(l) denotes a signal actually sent on the line K.
A method for channel estimating, comprising:
- receiving, at a transceiver on a newly added_line K, a signal comprising a combination of K-1 signals sent on lines 1 to K-1;
- obtaining, at the transceiver, a signal-to-noise ratio (SNR) of the line K in response to the reception of the signal;
- and
- calculating, at the transceiver, crosstalk channels of the line K according to K-1 coefficients associated with the K-1 signals sent on the lines 1 to K-1 and the SNR;
- wherein the combination of the K-1 signals sent on lines 1 to K-1 is based on a formula
- x
- K
- (
- n
- )
-
- (
- l
- )
- =
- s
- K
- (
- n
- )
-
- (
- l
- )
- +
- ɛ
-
- ∑
- i
- =
- 1
- K
- -
- 1
-
-
- z
- i
- (
- n
- )
-
-
- s
- i
- (
- n
- )
-
- (
- l
- )
- ,
- wherein ε indicates a step;
- zi(n) indicates a coefficient of line i during SNR measurement n;
- si(n)(l) denotes a signal to be sent on symbol 1 of line i during SNR measurement n;
- and xK(n)(l) denotes a signal actually sent on the line K.
An apparatus comprising a transceiver configured to:
- receive, on line K, a signal comprising a combination of K-1 signals sent on lines 1 to K-1, wherein the line K is a newly added one;
- obtain a signal-to-noise ratio (SNR) of the line K in response to the reception of the signal;
- and
- calculate crosstalk channels of the line K according to K-1 coefficients associated with the K-1 signals sent on the lines 1 to K-1 and the SNR;
- wherein the combination of the K-1 signals sent on lines 1 to K-1 is based on a formula:
- x
- K
- (
- n
- )
-
- (
- l
- )
- =
- s
- K
- (
- n
- )
-
- (
- l
- )
- +
- ɛ
-
- ∑
- i
- =
- 1
- K
- -
- 1
-
- z
- i
- (
- n
- )
-
- s
- i
- (
- n
- )
-
- (
- l
- )
- ,
- wherein ε indicates a step;
- zi(n) indicates a coefficient of line i during SNR measurement n;
- si(n)(l) denotes a signal to be sent on symbol 1 of line i during SNR measurement n;
- and xK(n)(l) denotes a signal actually sent on the line K.
Dependencies are inferred from the claim text.