US5748680A
Expired / Lapsed
US
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Coarse frequency burst detector for a wireline communications system
Assignee: Avago Technologies International Sales Pte Ltd
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Filing: 1994-12-16
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Granted: 1998-05-05
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Expires: 2014-12-16
Abstract
Abstract Briefly, in accordance with one embodiment of the invention, a coarse frequency burst detector for use at the receiving end of a wireline communications system comprises: a digital signal filter adapted to filter a component of decoded signal samples, the decoded signal samples being derived from a baseband signal transmitted via the wireline communications system; and a threshold detector adapted to threshold the signal level of the filtered component of the decoded signal samples with respect to a substantially predetermined level. In accordance with another embodiment, a method of detecting at the receiving end of a wireline communications system a frequency burst in a baseband signal transmitted via the wireline communications system comprises the steps of: filtering a component of a decoded signal derived from the baseband signal transmitted via the wireline communications system; and thresholding the filtered component.
Inventors
- 👤 Mohammad Shafiul Mobin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:04
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/18; H04L27/22; H04L7/00; H04L7/04; H04L7/041; H04L2007/047
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
89 words
A method of detecting at the receiving end of a wireline communications system a frequency correction burst in a baseband signal transmitted via the wireline communications system, the frequency correction burst comprising a plurality of digital samples of a same binary value; said method comprising the steps of: separately filtering orthogonal components of decoded signal samples derived from the baseband signal transmitted via the wireline communications system; constructively combining the magnitudes of the separately filtered orthogonal components; and thresholding the constructively combined magnitudes to detect the frequency correction burst.
Claim 2
Independent Claim
89 words
A method of detecting at the receiving end of a wireline communications system a frequency correction burst in a baseband signal transmitted via the wireline communications system, the frequency correction burst comprising a plurality of digital samples of a same binary value; said method comprising the steps of: separately filtering orthogonal components of decoded signal samples derived from the baseband signal transmitted via the wireline communications system; constructively combining the magnitudes of the separately filtered orthogonal components; and thresholding the constructively combined magnitudes to detect the frequency correction burst.
Claim 3
Dependent Claim
31 words
The method of claim 1, and further comprising, prior to the filtering step, the step of: deriving the decoded signal samples from the baseband signal transmitted via the wireline communications system.
Claim 4
Dependent Claim
30 words
The method of claim 2, wherein the deriving step comprises the steps of: converting the baseband signal to baseband signal samples; and adjusting the phase of the baseband signal samples.
Claim 5
Dependent Claim
28 words
The method of claim 3, wherein the step of adjusting the phase comprises the steps of: phase compensating the baseband signal samples; and derotating the baseband signal samples.
Claim 6
Dependent Claim
18 words
The method of claim 3, wherein the step of adjusting the phase comprises derotating the baseband signal samples.
Claim 7
Dependent Claim
32 words
The method of claim 1, wherein the step of separately filtering orthogonal components of decoded signal samples comprises separately filtering the inphase components and the quadrature components of the decoded signal samples.
Claim 8
Dependent Claim
30 words
The method of claim 6, wherein the step of separately filtering the inphase components and the quadrature components comprises separately moving average filtering the inphase components and the quadrature components.
Claim 9
Dependent Claim
53 words
The method of claim 1, wherein the step of constructively combining the magnitudes of the separately filtered orthogonal components comprises: detecting the sign of each of the separately filtered orthogonal components; complementing any negative filtered orthogonal component so as to obtain its magnitude; and combining the magnitudes of the separately filtered orthogonal components.
Claim 10
Independent Claim
89 words
A method of detecting at the receiving end of a wireline communications system a frequency correction burst in a baseband signal transmitted via the wireline communications system, the frequency correction burst comprising a plurality of digital samples of a same binary value; said method comprising the steps of: separately filtering orthogonal components of a decoded signal derived from the baseband signal transmitted via the wireline communications system; constructively combining the magnitudes of the separately filtered orthogonal components; and thresholding the constructively combined magnitudes to detect the frequency correction burst.
Claim 11
Independent Claim
89 words
A method of detecting at the receiving end of a wireline communications system a frequency correction burst in a baseband signal transmitted via the wireline communications system, the frequency correction burst comprising a plurality of digital samples of a same binary value; said method comprising the steps of: separately filtering orthogonal components of a decoded signal derived from the baseband signal transmitted via the wireline communications system; constructively combining the magnitudes of the separately filtered orthogonal components; and thresholding the constructively combined magnitudes to detect the frequency correction burst.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-05-04 | 2001-11-03 | 2002-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-05-04 | 2005-11-03 | 2006-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-05-04 | 2009-11-03 | 2010-05-05 | $7700.00 | Window Closed / Lapsed |