System and method for establishing a power level for a communication signal transmitted in a conductor
AssigneeAlcatel Canada Inc.
InventorAndrew Gordon Tomilson
Life of this patent
Estimating the term…
Abstract
A method of establishing a transmission power level for signals transmitted in a conductor is provided in an environment where signal interference is present between the signals in the conductor and separate signals carried in a proximate conductor. The method includes the steps of determining a reference signal interference level at an end of the proximate conductor from a reference signal capable of being propagated from an opposing end of the proximate conductor and determining a transmission power level for the signals to provide a signal interference level based on the reference signal interference level. A system embodying the method is also provided.
Claims23
A method of establishing a transmission power level for signals transmitted in a conductor in an environment where signal interference is present between said signals in said conductor and separate signals carried in a proximate conductor, said method comprising the steps of:
- determining a reference signal interference level at an end of said proximate conductor from a reference signal capable of being propagated from an opposing end of said proximate conductor;
- and
- determining a transmission power level for said signals to provide a signal interference level based on said reference signal interference level;
- and
- wherein said transmission power level is determined utilizing a transmission power level function that is dependent on frequency of said signals, and said transmission power level function is expressed as:
- VDSL
- PSD
-
- (
- f
- )
- =
- ADSL
- FEXT
-
- (
- f
- )
- -
- 10
-
-
- log
-
- (
- K
- FEXT
- ×
- L
- c
- ×
- (
- 1
- 49
- )
- 0.6
- ×
- f
- 2
- )
- +
- Atten
-
- (
- L
- c
- ,
- f
- )
- where VDSLPSD(f) is said transmission power level for said signals, Lc is a common loop length of said proximate conductor with said conductor carrying said signals. KFEXT is a coupling constant for said conductor, f is said frequency of said signals, Atten is a first attenuation function for signals propagated through said conductor dependent on Lc and f and ADSLFEXT(f) is said reference signal interference level.
A power level transmission controller for establishing a transmission power level for signals transmitted in a conductor in an environment where signal interference is present between said signals in said conductor and separate signals carried in a proximate conductor, said transmitting controller device comprising:
- a transmission power level mask for regulating a transmission power level of said signals transmitted in said conductor, said transmission power level to provide a signal interference level to said separate signals in said proximate conductor based on a reference signal interference level at an end of said proximate conductor from a reference signal capable of being propagated from an opposing end of said proximate conductor
- wherein said transmission power level is determined utilizing a transmission power level function that is dependent on frequency of said signals and is expressed as:
- VDSL
- PSD
-
- (
- f
- )
- =
- ADSL
- FEXT
-
- (
- f
- )
- -
- 10
-
-
- log
-
- (
- K
- FEXT
- ×
- L
- c
- ×
- (
- 1
- 49
- )
- 0.6
- ×
- f
- 2
- )
- +
- Atten
-
- (
- L
- c
- ,
- f
- )
- where VDSLPSD(f) is said transmission power level for said signals, Lc is a common loop length of said proximate conductor with said conductor carrying said signals, KFEXT is a coupling constant for said conductor, f is said frequency of said signals, Atten is a first attenuation function for signals propagated through said conductor dependent on Lc and f and ADSLFEXT(f) is said reference signal interference level.
A method of adjusting a power spectral density (PSD) of an xDSL signal transmitted over a cable, the cable having local loops for transmission of the xDSL signal and a further xDSL signal, the xDSL and further xDSL signals having a region of overlapping frequency bands, comprising:
- transmitting the further xDSL signal over a first of said loops from a central terminal unit to a first remote terminal unit;
- determining a far-end cross talk (FEXT) interference present in the further xDSL signal during said transmitting the further xDSL signal over said first of said loops;
- inserting the xDSL signal over a second of said loops at a neighbourhood terminal unit for transmission to a second remote terminal unit;
- determining a common loop length as the region of the first of said loops that overlaps with the second of said loops;
- and
- adjusting the FEXT interference to generate an adjusted FEXT interference value using at least the common loop length;
- and
- maintaining the power spectral density (PSD of the xDSL signal in the region outside the overlapping frequency bands and adjusting the (PSD) of the xDSL signal in the region of overlapping frequency bands utilizing the common loop length, the distance from the neighborhood terminal unit to the central terminal unit and the adjusted FEXT interference value.
Dependencies are inferred from the claim text.