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 upstream masks (U1, U2, U3, . . . , Un) and a number of downstream masks (D1, D2, D3, . . . , Dn).
- 10. The method of claim 9 wherein one of the number of upstream masks is defined by the following relations, wherein f is a frequency band in kHz and U1 is the value of the mask in dBm/Hz:
for 0<f<4, then U1=−97.5, with max power in the in 0-4 kHz band of +15 dBm; for 4<f≦25.875, then U1=−92.5+23.43×log2(f/4); for 25.875<f≦60.375, then U1=−29.0; for 60.375<f≦90.5, then U1=34.5−95×log2 (D/60.375); for 90.5<f≦1221, then U1=−90; for 1221<f≦1630, then U1=−99.5 peak, with max power in the [f,f+1 MHz] window of (−90−48×log2(f/1221)+60) dBm; and for 1630<f≦11040, then U1=−99.5 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 downstream masks is defined by the following relations, wherein f is a frequency band in kHz and D1 is the value of the mask in dBm/Hz:
for 0<f≦4, then D1=−97.5, with max power in the in 0-4 kHz band of +15 dBm; for 4<f≦25.875, then D1=−92.5+20.79×log2(f/4); for 25.875<f≦81, then D1=−36.5; for 81<f≦92.1, then D1=−36.5−70×log2(fi/81); for 92.1<f≦121.4, then D1−49.5; for 121.4<f≦138, then D1=−49.5+70×log2(f/121.4); for 138<f≦353.625, then D1=−36.5+0.0139×(f−138); for 353.625<f≦569.25, then D1=−33.5; for 569.25<f≦1622.5, then D1=−33.5−36×log2(f/569.25); for 1622.5<f≦3093, then D1=−90; for 3093<f≦4545, then D1=−90 peak, with maximum power in the [f,f+1 MHz] window of (−36.5−36×log2(f/1104)+60)dBm; and for 4545<f≦11040, then D1=−90 peak, with maximum power in the [f, f+1 MHz] window of −50 dBm.
- 12. The method of claim 9 wherein one of the number of upstream masks is defined by the following relations, wherein f is a frequency band in kHz and U2 is the value of the mask in dBm/Hz:
for 0<f≦4, then U2=−97.5, with max power in the in 0-4 kHz band of +15 dBm; for 4<f≦25.875, then U2=−92.5−22.5×log2(f/4); for 25.875<f≦86.25, then U2=−30.9; for 86.25<f≦138.6, then U2=−34.5−95×log2 (f/86.25); for 138.6<f≦1221, then U2=−99.5; for 1221<f≦1630, then U2=−99.5 peak, with max power in the [f,f+1 MHz] window of (−90−48×log2(f/1221)+60) dBm; and for 1630<f≦11040, then U2=−99.5 peak, with max power in the [f,f+1 MHz] window of −50 dBm.
- 13. The method of claim 9 wherein one of the number of downstream masks is defined by the following peak values, wherein f is a frequency in kHz and D2 is the peak value of the mask in dBm/Hz:
for f=0.0, then D2=−98.0; for f=3.99, then D2=−98.00; for f=4.0, then D2=−92.5; for f=80.0, then D2=−72.5; for f=120.74, then D2=−47.50; for f=120.75, then D2=−37.80; for f=138.0, then D2=−36.8; for f=276.0, then D2=−33.5; for f=677.0625, then D2=−33.5; for f=956.0, then D2=−62.0; for f=1800.0, then D2=−62.0; for f=2290.0, then D2=−90.0; for f=3093.0, then D2=−90.0; for f=4545.0, then D2=−110.0; and for f=12000.0, then D2=−110.0.
- 14. The method of claim 9 wherein one of the number of upstream masks is defined by the following peak values, wherein f is a frequency in kHz and U3 is the peak value of the mask in dBm/Hz:
for f=0, then U3=−101.5; for f=4, then U3=−101.5; for f=4, then U3=−96; for f=25.875, then U3=−36.30; for f=103.5, then U3=−36.30; for f=164.1, then U3=−99.5; for f=1221, then U3=−99.5; for f=1630, then U3=−113.5; and for f=12000, then U3=−113.5.
- 15. The method of claim 9 wherein one of the number of downstream masks is defined by the following peak values, wherein f is a frequency in kHz and D3 is the peak value of the mask in dBm/Hz:
for f=0, then D3=−101.5; for f=4, then D3=−101.5; for f=4, then D3=−96; for f=80, then D3=−76; for f=138, then D3=−47.5; for f=138, then D3=−40; for f=276, then D3=−37; for f=552, then D3=−37; for f=956, then D3=−65.5; for f=1800, then D3=−65.5; for f=2290, then D3=−93.5; for f=3093, then D3=−93.5; for f=4545, then D3=−113.5; and for f=12000, then D3=−113.5.
RELATED APPLICATIONS
[0001] The present invention claims priority to U.S. Provisional Application Nos. 60/488,804 filed Jul. 22, 2003 and Ser. No. 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,” (Attorney Docket No. 56162.000456) which claims priority to U.S. Provisional Patent Application No. 60/441,351, “ENHANCED SMART DSL FOR LDSL,” (Attorney Docket No. 56162.000483) which claims priority to U.S. Provisional Application No. 60/488,804 filed Jul. 22, 2003 and “POWER SPECTRAL DENSITY MASKS FOR IMPROVED SPECTRAL COMPATIBILITY” (Attorney Docket No. 56162.000485) which claims priority to U.S. Provisional Application No. 60/491,268 filed Jul. 31, 2003, all filed concurrently herewith.
Provisional Applications (2)
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Number |
Date |
Country |
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60488804 |
Jul 2003 |
US |
|
60426796 |
Nov 2002 |
US |
Patent Application
20040218667
