DBMsOL and FBMsOL power spectral density masks

Details DBMsOL and FBMsOL power spectral density masks DBMsOL and FBMsOL power spectral density masks

2003-07-25

2009-12-15

Tse, Young T. (Department: 2611)

Pulse or digital communications

Transceivers

Modems

Reexamination Certificate

active

07633999

ABSTRACT:
In accordance with one embodiment of the present invention, a power spectral density (PSD) mask for spectral shaping of a dual bit map (DBM) mode downstream transmission is provided. The PSD mask is represented by the equation:PSDDBMsOL=KADSL_OL×Cf0×[sin⁡(π⁢ff0)]2(π⁢ff0)2×11+(ffLP3dB)12×11+(fHP3dBf)6,0≺f≺∞where PSDDBMsOLrepresents the PSD mask, KADSL—OLrepresents a constant value, C represents a constant value, f represents a frequency of the downstream transmission, f0represents a constant value, fLP3dBrepresents a 3 decibel (dB) low pass frequency and ffHP3dBrepresents a 3 dB high pass frequency. KADSL—OLpreferably has a value between 0.0900 watts and 0.1200 watts and more preferably has a value of 0.1104 watts. The constant f0preferably has a value between 2.100 megahertz and 2.300 megahertz and more preferably has a value of 2.208 megahertz. The constant fLP3dBhas a value substantially equal tof02.The constant fHP3dBhas preferably has a value between 100 kilohertz and 150 kilohertz and more preferably has a value of 130 kilohertz. The constant C preferably has a value between 0.1 and 10 and more preferably has a value of 2.

REFERENCES:
patent: 2002/0008525 (2002-01-01), Seagraves et al.
patent: 2003/0108095 (2003-06-01), Duvaut et al.
International Telecommunication Union, Asymmetric digital subscriber line (ADSL) Transceivers G.992.1, Jun. 1999, pp. 123-135 and 54-63.
International Search Report dated Dec. 12, 2003 for Application No. PCT/US03/23105.

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