Claims
- 1. A method for selecting a spectral mask for use with a DSL system, the method comprising:
obtaining a weighted ratio of upstream rates and downstream rates; determining whether a cost function, based in part upon the weighted ratio, is greater than a predetermined value; and selecting a spectral mask based in part upon the determination of whether the cost function is greater than a predetermined value.
- 2. The method of claim 1 wherein determining whether a cost function is greater than a predetermined value further comprises:
determining a cost function according to the relation: cost function=2*(dsrate(2)−dsrate(1))/dsrate(1)+(usrate(2)−usrate(1))/usrate(1), wherein dsrate(1) is the downstream rate of a first mask, dsrate(2) is the downstream rate of a second mask, usrate(1) is the upstream rate of the first mask and usrate(2) is the upstream rate of the second mask.
- 3. The method of claim 1 wherein the predetermined value is zero.
- 4. The method of claim 2 wherein the predetermined value is zero and wherein, if the cost function is greater than zero, the second mask is selceted.
- 5. The method of claim 2 wherein the f is a frequency band in kHz and the upstream value of the first mask is given by the following relations for U1 in dBm/Hz:
for 0≦f<4, then U1=−101.5; for 4<f<25.875, then U1=−96+23.4*log2(f/4); for 25.875≦f<60.375, then U1=−32.9; for 60.375≦f<686, then U1=max{−32.9−95×log2(f/60.38), 10×log10[0.05683×(f×103)−1.5]−3.5}; for 686≦f<1411, then U=−103.5; for 1411≦f<1630, then U1=−103.5 peak, −113.5 average in any [f, f+1 MHz] window; and for 1630≦f<12000, then U1=−103.5 peak, −115.5 average in any [f, f+1 MHz] window.
- 6. The method of claim 2 wherein the f is a frequency band in kHz and the downstream value of the first mask is given by the following relations for D1 in dBm/Hz:
for 0≦f<4, then D1=−101; for 4≦f<25.875, then D1=−96+20.79*log2(f/4); for 25.875≦f<91, then D1=−40; for 91≦f<99.2, then D1=−44; for 99.2≦f<138, then D1=−52; for 138≦f<353.625, then D1=−40.2+0.0148*(f−138); for 353.625≦f<552, then D1=−37; for 552≦f<1012, then D1=−37−36*log2(f/552); for 1012≦f<1800, then D1=−68.5; for 1800≦f<2290, then D1=−68.5−72*log2(f/1800); for 2290≦f<3093, then D1=−93.500; for 3093≦f<4545, then D1=−93.5 peak, average −40−36*log2(f/1104) in any [f, f+1 MHz] window; and for 4545≦f<12000, then D1=−93.5 peak, average −113.500 in any [f, f+1 MHz] window.
- 7. The method of claim 2 wherein the f is a frequency band in kHz and the upstream value of the second mask is given by the following relations for U2 in dBm/Hz:
for 0≦f<4, then U2=−101.5; for 4≦f<25.875, then U2=−96+21.5×log2(f/4); for 25.875≦f<103.5, then U2=−36.4; for 103.5≦f<686, then U2=max{−36.3−95×log2(f/103.5), 10×log10[0.05683×(f×103)−1.5]−3.5}; for 686≦5f<1411, then U2=−103.5; for 1411≦f<1630, then U2=−103.5 peak, −113.5 average in any [f, f+1 MHz] window; and for 1630≦f<12000, then U2=−103.5 peak, −115.5 average in any [f, f+1 MHz] window.
- 8. The method of claim 2 wherein the f is a frequency band in kHz and the downstream value of the second mask is given by the following relations for D2 in dBm/Hz:
for 0≦f<4, then D2=−101.5; for 4≦f<80, then D2=−96+4.63*log2(f/4); for 80≦f<138, then D2=−76+36*log2(f/80); for 138≦f<276.000; then D2=−42.95+0.0214*f; for 276≦f<552.000; then D2=−37; for 552≦f<1012, then D2=−37−36*log2(f/552); for 1012≦f<1800, then D2=−68.5; for 1800≦f<2290, then D2=−68.5−72*log2(f/1800); for 2290≦f<3093, then D2=−93.5; for 3093≦f<4545, then D2=−93.5 peak, average −40−36*log2(f/1104) in any [f, f+1 MHz] window; and for 4545≦f<12000, then D2−−93.5 peak, average −113.500 in any [f, f+1 MHz] window.
RELATED APPLICATIONS
[0001] The present invention claims priority to U.S. Provisional Application No. 60/441,351 filed Jan. 22, 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 “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 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 |
|
60441351 |
Jan 2003 |
US |
|
60426796 |
Nov 2002 |
US |
Patent Application
20040136329
