Equalized SNR power back-off

Claim 2

1 . A power back-off method to mitigate the effects of FEXT noise in a communication system comprising at least one transmitter k, the transmitter k transmitting to a central site via a corresponding channel, the method comprising: determining a transmit power spectral density for the transmitter k, S(f,l k ), according to: S  ( f , l k ) = ( l k l R ) υ  S  ( f , l R ) ·  H  ( f , l R )  2  H  ( f , l k )  2   for   l k ≤ l R wherein l k is a channel length of the channel corresponding to the transmitter k, H(f,l k ) is a channel transfer function of the channel corresponding to the transmitter k, l R is a reference channel length, H(f,l R ) is a reference channel transfer function, S(f,l R ) is a reference transmit power spectral density, and υ≠−1 or 0; and controlling transmitter k to transmit at the transmit power spectral density S(f,l k ).

Claim 3

2 . A power back-off method, as per claim 1 , wherein υ is set close to one to provide substantially equalized data rates for channels of the communication system.

Claim 4

3 . A power back-off method, as per claim 2 , wherein υ is set to approximately 0.95.

Claim 5

4 . A power back-off method, as per claim 1 , wherein said communication system is a VDSL system.

Claim 6

5 . A communication system comprising: at least one transmitter k, the transmitter transmitting to the central site with a transmit power spectral density S(f,l k ) via a corresponding channel, wherein the channel has a length l k and a channel transfer function H(f,l k ); and wherein the transmit power spectral density S(f,lk) is governed according to: S  ( f , l k ) = ( l k l R ) υ  S  ( f , l R ) ·  H  ( f , l R )  2  H  ( f , l k )  2   for   l k ≤ l R where l R is a reference channel length, H(f,l R ) is a reference channel transfer function, S(f,l R ) is a reference transmit power spectral density, and υ≠−1 or 0.

Claim 7

5 . A communication system comprising: at least one transmitter k, the transmitter transmitting to the central site with a transmit power spectral density S(f,l k ) via a corresponding channel, wherein the channel has a length l k and a channel transfer function H(f,l k ); and wherein the transmit power spectral density S(f,lk) is governed according to: S  ( f , l k ) = ( l k l R ) υ  S  ( f , l R ) ·  H  ( f , l R )  2  H  ( f , l k )  2   for   l k ≤ l R where l R is a reference channel length, H(f,l R ) is a reference channel transfer function, S(f,l R ) is a reference transmit power spectral density, and υ≠−1 or 0.

Claim 8

6 . A communication system, as per claim 5 , wherein υ is set close to one to provide substantially equalized data rates for channels of the communication system.

Claim 9

7 . A communication system, as per claim 6 , wherein υ is set to approximately 0.95.

Claim 10

8 . A communication system, as per claim 5 , wherein said communication system is a VDSL system.

Claim 11

9 . A transmitter that transmits on a channel with a transmit power spectral density S(f,l k ) according to: S  ( f , l k ) = ( l k l R ) υ  S  ( f , l R ) ·  H  ( f , l R )  2  H  ( f , l k )  2   for   l k ≤ l R wherein l k is a channel length of the channel, H(f,l k ) is a channel transfer function of the channel, S(f,l R ) is a reference transmit power spectral density, l R is a reference channel length, H(f,l R ) is a reference channel transfer function, and υ≠−1 or 0.

Claim 12

9 . A transmitter that transmits on a channel with a transmit power spectral density S(f,l k ) according to: S  ( f , l k ) = ( l k l R ) υ  S  ( f , l R ) ·  H  ( f , l R )  2  H  ( f , l k )  2   for   l k ≤ l R wherein l k is a channel length of the channel, H(f,l k ) is a channel transfer function of the channel, S(f,l R ) is a reference transmit power spectral density, l R is a reference channel length, H(f,l R ) is a reference channel transfer function, and υ≠−1 or 0.

Claim 13

10 . A transmitter that transmits on a channel with a transmit power spectral density, as per claim 9 , wherein υ is set close to one to provide substantially equalized data rates.

Claim 14

11 . A transmitter that transmits on a channel with a transmit power spectral density, as per claim 10 , wherein υ is set to approximately 0.95.

Claim 15

12 . A transmitter that transmits on a channel with a transmit power spectral density, as per claim 9 , wherein the transmitter and the channel are part of a VDSL system.

Claim 16

13 . A transmitter that transmits on a channel in a communication system, wherein the transmitter transmits with a transmit power spectral density that is controlled to provide substantially equal data rates for each channel in the communication system.

Claim 17

13 . A transmitter that transmits on a channel in a communication system, wherein the transmitter transmits with a transmit power spectral density that is controlled to provide substantially equal data rates for each channel in the communication system.

Claim 18

14 . A transmitter that transmits on a channel in a communication system, as per claim 13 , wherein the transmitter transmits with a transmit power spectral density S(f,l k ) according to: S  ( f , l k ) = ( l k l R ) υ  S  ( f , l R ) ·  H  ( f , l R )  2  H  ( f , l k )  2   for   l k ≤ l R wherein l k is a channel length of the channel that the transmitter transmits on, H(f,l k ) is a channel transfer function of the channel that the transmitter transmits on, S(f,l R ) is a reference transmit power spectral density, l R is a reference channel length, H(f,l R ) is a reference channel transfer function, and υ is close to one.

Claim 19

15 . A transmitter that transmits on a channel in a communication system, as per claim 14 , wherein υ is set to approximately 0.95.

Claim 20

16 . A transmitter that transmits on a channel in a communication system, as per claim 13 , wherein the transmitter and the channel are part of a VDSL system.

Claim 21

17 . A power back-off method to mitigate the effects of FEXT noise in a communication system comprising at least one transmitter k, the transmitter k transmitting to a central site via a corresponding channel, the method comprising: determining the transmit power spectral density for the transmitter k, S(f,l k ), according to: S  ( f , l k ) = G · ( l k l R ) υ  S  ( f , l R ) ·  H  ( f , l R )  2  H  ( f , l k )  2   for   l k ≤ l R wherein l k is a channel length of the channel corresponding to the transmitter k, H(f,l k ) is a channel transfer function of the channel corresponding to the transmitter k, l R is a reference channel length, H(f,l R ) is a reference channel transfer function, S(f,l R ) is a reference transmit power spectral density, and G has a value that depends on the channel length l k such that two or more data rate service areas are defined; and controlling transmitter k to transmit at the transmit power spectral density S(f,l k ).

Claim 22

17 . A power back-off method to mitigate the effects of FEXT noise in a communication system comprising at least one transmitter k, the transmitter k transmitting to a central site via a corresponding channel, the method comprising: determining the transmit power spectral density for the transmitter k, S(f,l k ), according to: S  ( f , l k ) = G · ( l k l R ) υ  S  ( f , l R ) ·  H  ( f , l R )  2  H  ( f , l k )  2   for   l k ≤ l R wherein l k is a channel length of the channel corresponding to the transmitter k, H(f,l k ) is a channel transfer function of the channel corresponding to the transmitter k, l R is a reference channel length, H(f,l R ) is a reference channel transfer function, S(f,l R ) is a reference transmit power spectral density, and G has a value that depends on the channel length l k such that two or more data rate service areas are defined; and controlling transmitter k to transmit at the transmit power spectral density S(f,l k ).

Claim 23

18 . A power back-off method, as per claim 17 , wherein G>1 for channel length l k less than a length l R1 that delineates a first data rate service area and G=1 for channel length l k greater than the length l R1 so as to define a second data rate service area.

Claim 24

19 . A power back-off method, as per claim 17 , wherein υ is set close to one to provide substantially equalized data rates for channels of the communication system.

Claim 25

20 . A power back-off method, as per claim 19 , wherein υ is set to approximately 0.95.

Claim 26

21 . A power back-off method, as per claim 17 , wherein said communication system is a VDSL system.

Claim 27

22 . A communication system comprising: at least one transmitter k, the transmitter transmitting to the central site with a transmit power spectral density S(f,l k ) via a corresponding channel, wherein the channel has a length l k and a reference channel transfer function H(f,l k ); and wherein the transmit power spectral density S(f,lk) is governed according to: S  ( f , l k ) = G · ( l k l R ) υ  S  ( f , l R ) ·  H  ( f , l R )  2  H  ( f , l k )  2   for   l k ≤ l R where l R is a reference channel length, H(f,l R ) is a reference channel transfer function, S(f,l R ) is a reference transmit power spectral density, and G has a value that depends on the channel length l k such that two or more data rate service areas are defined.

Claim 28

22 . A communication system comprising: at least one transmitter k, the transmitter transmitting to the central site with a transmit power spectral density S(f,l k ) via a corresponding channel, wherein the channel has a length l k and a reference channel transfer function H(f,l k ); and wherein the transmit power spectral density S(f,lk) is governed according to: S  ( f , l k ) = G · ( l k l R ) υ  S  ( f , l R ) ·  H  ( f , l R )  2  H  ( f , l k )  2   for   l k ≤ l R where l R is a reference channel length, H(f,l R ) is a reference channel transfer function, S(f,l R ) is a reference transmit power spectral density, and G has a value that depends on the channel length l k such that two or more data rate service areas are defined.

Claim 29

23 . A communication system, as per claim 22 , wherein G>1 for channel length l k less than a length l R1 that delineates a first data rate service area and G=1 for channel length l k greater than the length l R1 so as to define a second data rate service area.

Claim 30

24 . A communication system, as per claim 22 , wherein υ is set close to one to provide substantially equalized data rates for channels of the communication system.

Claim 31

25 . A communication system, as per claim 24 , wherein υ is set to approximately 0.95.

Claim 32

26 . A communication system, as per claim 22 , wherein said communication system is a VDSL system.

Claim 33

27 . A transmitter that transmits on a channel in a communication system, wherein the transmitter transmits with a transmit power spectral density S(f,l k ) according to: S  ( f , l k ) = G · ( l k l R ) υ  S  ( f , l R ) ·  H  ( f , l R )  2  H  ( f , l k )  2   for   l k ≤ l R wherein l k is a channel length of the channel that the transmitter transmits on, H(f,l k ) is a channel transfer function of the channel that the transmitter transmits on, S(f,l R ) is a reference transmit power spectral density, l R is a reference channel length, H(f,l R ) is a reference channel transfer function, and G has a value that depends on the channel length l k such that two or more data rate service areas are defined.

Claim 34

27 . A transmitter that transmits on a channel in a communication system, wherein the transmitter transmits with a transmit power spectral density S(f,l k ) according to: S  ( f , l k ) = G · ( l k l R ) υ  S  ( f , l R ) ·  H  ( f , l R )  2  H  ( f , l k )  2   for   l k ≤ l R wherein l k is a channel length of the channel that the transmitter transmits on, H(f,l k ) is a channel transfer function of the channel that the transmitter transmits on, S(f,l R ) is a reference transmit power spectral density, l R is a reference channel length, H(f,l R ) is a reference channel transfer function, and G has a value that depends on the channel length l k such that two or more data rate service areas are defined.

Claim 35

28 . A transmitter that transmits on a channel in a communication system, as per claim 27 , wherein G>1 for channel length l k less than a length l R1 that delineates a first data rate service area and G=1 for channel length l k greater than the length l R1 so as to define a second data rate service area.

Claim 36

29 . A transmitter that transmits on a channel in a communication system, as per claim 27 , wherein υ is set close to one to provide substantially equalized data rates for channels of the communication system.

Claim 37

30 . A transmitter that transmits on a channel in a communication system, as per claim 29 , wherein υ is set to approximately 0.95.

Claim 38

31 . A transmitter that transmits on a channel in a communication system, as per claim 27 , wherein said communication system is a VDSL system.