Method and device for processing data and to a communication system comprising such device
A method and a device process data transmitted via a channel. The channel is at least partially represented by a symmetrical transfer matrix, wherein at least one off-diagonal matrix element of the transfer matrix is determined by its symmetric and/or transposed off-diagonal matrix element and its corresponding diagonal matrix elements of the transfer matrix. In addition, a communication system is provided containing such a device.
1. A method for processing data transmitted via a communication channel connecting a central office and equipment at at least two customer premises, the communication channel having a first portion from the central office via a cable binder and a second portion from the cable binder to the equipment at the customer premises, which comprises the steps of:
in a device for processing data having a processor unit, representing the communications channel via a transfer matrix having a first transfer matrix for the first portion and a second transfer matrix for the second portion; and
in the device for processing data, determining at least one off-diagonal matrix element of the transfer matrix by at least one of its symmetric off-diagonal matrix element and transposed off-diagonal matrix element and corresponding diagonal matrix elements of the transfer matrix.
2. The method according to claim 1 , which further comprises, in the device for processing data, determining the at least one off-diagonal matrix element of the transfer matrix by equation:
H
(
n
,
k
)
=
H
(
k
,
n
)
·
H
(
n
,
n
)
H
(
k
,
k
)
wherein
H(n,k), H(k,n) are off-diagonal entries of the transfer matrix; and
H(k,k), H(n,n) are diagonal parts of the transfer matrix.
3. The method according to claim 1 , wherein the transfer matrix at least one of represents and is associated with wires of a cable binder.
4. The method according to claim 1 , which further comprises, in the device for processing data, processing the data by utilizing the transfer matrix for at least one of noise cancellation purposes and for precoding purposes.
5. The method according to claim 4 , wherein the noise includes at least one of crosstalk, interference and alien noise.
6. The method according to claim 1 , wherein the communication channel connects the central office and the equipment of at least two customer premises.
7. The method according to claim 1 , wherein the communication channel connects at least one transmitter with at least one receiver.
8. The method according to claim 1 , which further comprises performing the method in a MIMO environment.
9. The method according to claim 1 , which further comprises performing the method in a MIMO environment containing at least one of digital subscriber lines and mobile radio links.
10. A device for processing data, comprising:
a processor unit programmed to:
perform a method for processing data transmitted via a communication channel connecting a central office and equipment at at least two customer premises, the communication channel having a first portion from the central office via a cable binder and a second portion from the cable binder to the equipment at the customer premises;
represent the communications channel via a transfer matrix having a first transfer matrix for the first portion and a second transfer matrix for the second portion; and
determine at least one off-diagonal matrix element of the transfer matrix by at least one of its symmetric off-diagonal matrix element and transposed off-diagonal matrix element and corresponding diagonal matrix elements of the transfer matrix.
11. The device according to claim 10 , wherein the device is a communication device selected from the group consisting of the Central Office, a Digital Subscriber Line Access Multiplexer and the Equipment at the Customer Premises.
12. The device according to claim 10 , further comprising means for noise processing.
13. The device according to claim 12 , wherein said means for noise processing is selected from the group consisting of a precoder and a noise canceller.
14. The device according to claim 10 , wherein the device is associated with a communication device selected from the group consisting of the Central Office, a Digital Subscriber Line Access Multiplexer and the Equipment of Customer Premises.
15. A communication system, comprising:
a device for processing data having a processor unit programmed to:
perform a method for processing the data transmitted via a communication channel connecting a central office and equipment at at least two customer premises, the communication channel having a first portion from the central office via a cable binder and a second portion from the cable binder to the equipment at the customer premises;
represent the channel via a transfer matrix having a first transfer matrix for the first portion and a second transfer matrix for the second portion; and
determine at least one off-diagonal matrix element of the transfer matrix by at least one of its symmetric off-diagonal matrix element and transposed off-diagonal matrix element and corresponding diagonal matrix elements of the transfer matrix.