Claims
- 1. A method for implementing smart DSL for LDSL systems, the method comprising:
defining a candidate system to be implemented by an LDSL system; optimizing criteria associated with the candidate system; and selecting a candidate system to implement in an LDSL system.
- 2. The method of claim 1 wherein defining a candidate system further comprises:
determining features of upstream transmission.
- 3. The method of claim 2 wherein determining features of upstream transmission further comprises:
determining one or more of: cut-off frequencies, side lobe shapes, overlap, partial overlap or FDD characteristics.
- 4. The method of claim 1 wherein defining a candidate system further comprises:
determining features of downstream transmission.
- 5. The method of claim 4 wherein determining features of downstream transmission further comprises:
determining one or more of: cut-off frequencies, side lobe shapes, overlap, partial overlap or FDD characteristics.
- 6. The method of claim 1 wherein optimizing criteria associated with the candidate system further comprises:
optimizing criteria associated with the candidate system to fulfill upstream and downstream performance targets.
- 7. The method of claim 1 wherein selecting a candidate system to implement in an LDSL system further comprises:
selecting a spectral mask for use with upstream or downstream transmission.
- 8. The method of claim 1 wherein selecting a candidate system to implement in an LDSL system further comprises:
selecting a candidate system during modem handshake procedures.
- 9. The method of claim 1 wherein defining a candidate system to be implemented in an LDSL system further comprises defining a number of masks.
- 10. The method of claim 9 wherein one of the number of masks is defined by the following relations, wherein f is a frequency band in kHz and D is the value of the mask in dBm/Hz:
for 0<f≦4, then D=−97.5, with max power in the in 0-4 kHz band of +15 dBrn; for 4<f≦5, then D=−92.5+18.64 log2(f/4); for 5<f≦5.25, then D=−86.5; for 5.25<f≦16, then D=−86.5+15.25 log2(f/5.25); for 16<f≦32, then D=−62+25.5 log2(f/16); for 32<f≦138, then D=−36.5; for 138<f≦323.4375, then D=−31.8; for 323.4375<f≦517.5, then D=−31.8−0.0371×(f−323.4375); for 258.75<f≦1800, then D=max(−39−23.27×log2 (f/517.5),−65); for 1800<f≦2290, then D=−65−72×log2 (f/1800); for 2290<f≦3093, then D=−90; for 3093<f≦4545, then D=−90 peak, with max power in the [f,f+1 MHz] window of (−36.5−36×log2 (f/1104)+60) dBm; and for 4545<f≦11 040, then D=−90 peak, with max power in the [f,f+1 MHz] window of −50 dBm.
- 11. The method of claim 9 wherein one of the number of masks is defined by the following relations, wherein f is a frequency band in kHz and M is the value of the mask in dBm/Hz:
for 0<f<4, then M=−97.5; for 4<f<80, then M=−92.5+4.63.log2.(f/4); for 80<f<138, then M=−72.5+36.log2.(f/80); for 138<f<1104, then M=−37.9; for 1104<f<1622, then M=−37.9−15.5.log2.(f/1104); for 1622<f<3750, then M=−46.5−2.9.log2.(f/1622); for f=3750, then M=−76.5; for f=3925, them M=−101.5; and for f>3925, then M=−101.5.
- 12. The method of claim 9 wherein one of the number of masks is defined by the following relations, wherein f is a frequency band in kHz and D is the value of the mask in dBm/Hz:
for 0<f<4, then D=−97.5; for 4<f<25.875, then D=−92.5+21.log2.(f/4); for 25.875<f<1104, then D=−38.3; for 1104<f<1622, then D=−38.3−14.75.log2.(f/1104); for 1622<f<3750; then D=−46.5−2.9.log2.(f/1622); for f=3750, then D=−76.5; and for f>3925, then D=−101.5.
- 13. The method of claim 9 wherein one of the number of masks is defined by the following relations, wherein f is a frequency band in kHz and U is the value of the mask in dBm/Hz:
for 0<f<4, then U=−97.5; for 4<f<25.875, then U=−92.5+21.5.log2.(f/4); for 25.875<f<138, then U=−34.5; for 138<f<276, then U=−34.5−26.log2.(f/138); for 276<f<f_int, then U=−60.5−95.log2.(f/276); and for f_int<f<686, then U=10log10(0.05683*f{acute over ()}(1.5)).
- 14. The method of claim 9 wherein one of the number of masks is defined by the following relations, wherein f is a frequency band in kHz and M is the value of the mask in dBm/Hz:
for 0<f<4, then M=−97.5; for 4<f<80, then M=−92.5+4.63.log2.(f/4); for 80<f<138, then M=−72.5+36.log2.(f/80); for 138<f<1104, then M=−37.9; for 1104<f<1622, then M=−37.9−15.5.log2.(f/1104); for 1622<f<3750, then M=−46.5−2.9.log2.(f/1622); for f=3750; then M=−76.5; for f=3925, then M=−101.5; and for f>3925, then M=−101.5.
- 15. The method of claim 9 wherein one of the number of masks is defined by the following relations, wherein f is a frequency band in kHz and U is the value of the mask in dBm/Hz:
for 0<f<4, then U=−97.5; for 4<f<25.875, then U=−92.5+21.5.log2.(f/4); for 25.875<f<138, then U=−34.5; for 138<f<276, then U=−34.5−26.log2.(f/138); for 276<f<f_int, then U=−60.5−95.log2.(f/276); for f_int<f<686, then U=10log10(0.05683*f{acute over ()}(1.5)); and for f>686, then U=−100.
- 16. The method of claim 9 wherein one of the number of masks is defined by the following relations, wherein f is a frequency band in kHz and D is the value of the mask in dBm/Hz:
for 0<f<4, then D=−97.5; for 4<f<25.875, then D=−92.5+21.log2.(f/4); for 25.875<f<1104, then D=−38.3; for 1104<f<1622, then D=−38.3−14.75.log2.(f/1104); for 1622<f<3750, then D=−46.5−2.9.log2.(f/1622); for f=3750, then D=−76.5; and for f>3925, then D=−101.5.
RELATED APPLICATIONS
[0001] The present invention claims priority to U.S. Provisional Application Nos. 60/491,268 filed Jul. 31, 2003 and 60/426,796 filed Nov. 18, 2002, the contents of which are incorporated herein by reference in their entirety.
[0002] This application is related to copending U.S. patent applications titled “SYSTEM AND METHOD FOR SELECTABLE MASK FOR LDSL,” filed Jan. 22, 2003 (Attorney Docket No. 56162.000456) which claims priority to U.S. Provisional Application No. 60/441,351, “ENHANCED SMART DSL FOR LDSL,” (Attorney Docket No. 56162.000483), “ENHANCED SMART DSL FOR LDSL,” (Attorney Docket No. 56162.000484) which claim priority to U.S. Provisional Application No. 60/488,804 filed Jul. 22, 2003, all filed concurrently herewith.
Provisional Applications (2)
|
Number |
Date |
Country |
|
60491268 |
Jul 2003 |
US |
|
60426796 |
Nov 2002 |
US |
Patent Application
20040202239
