Patent US6559894B2 successfully refreshed from Google Patents.
US6559894B2
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Block-adaptive equalization using partial decision feedback in digital broadcast communications
Assignee: Vulcan Ventures Inc
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Filing: 2001-06-11
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Granted: 2003-05-06
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Expires: 2021-06-11
Abstract
Abstract A block-adaptive method of performing equalization on a signal received over a broadcast system, includes providing a set of predetermined symbols that correspond to symbols in a data field synchronization segment of a data field having a plurality of segments wherein a data frame having at least two of these data fields is transmitted over the signal in the broadcast system during a block-time interval, correlating complex samples of the signal with the set of predetermined symbols to extract a corresponding impulse response during the block-time interval, selecting a phase identifying the start of the block-time interval from the correlated complex samples, estimating an equalizer filter using the set of predetermined symbols and an initial data field synchronization segment provided at the start of the block-time interval, updating the equalizer filter using subsequent complex samples of the signal to extract a subsequent impulse response and correlate with a reference segment, wherein the reference segment corresponds to either the predetermined symbol sequence or a partial decision feedback segment.
Inventors
- 👤 Jimmy Kazuhiro Omura
- 👤 Thomas Ross Henderson
- 👤 Steve Dabell
- 👤 Mark Robert Peting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:47
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/004; H04L1/0056; H04L1/0059; H04L1/0071; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03012; H04L25/03114; H04L25/03133; H04L2025/0335; H04L2025/03375; H04L2025/03382; H04L2025/03592; H04L2025/03745; H04L2025/03764; H04L2025/0377
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
166 words
A method of performing equalization on a signal received over a broadcast system, comprising: providing a set of predetermined symbols that correspond to symbols in a data field synchronization segment of a data field having a plurality of segments wherein a data frame having at least two of these data fields is transmitted over the signal in the broadcast system during a block-time interval; correlating complex samples of the signal with the set of predetermined symbols to extract a corresponding impulse response during the block-time interval; selecting a phase identifying the start of the block-time interval from the correlated complex samples; estimating an equalizer filter using the set of predetermined symbols and an initial data field synchronization segment provided at the start of the block-time interval; updating the equalizer filter using subsequent complex samples of the signal to extract a subsequent impulse response and correlate with a reference segment, wherein the reference segment corresponds to either the predetermined symbol sequence or a partial decision feedback segment.
Claim 2
Independent Claim
166 words
A method of performing equalization on a signal received over a broadcast system, comprising: providing a set of predetermined symbols that correspond to symbols in a data field synchronization segment of a data field having a plurality of segments wherein a data frame having at least two of these data fields is transmitted over the signal in the broadcast system during a block-time interval; correlating complex samples of the signal with the set of predetermined symbols to extract a corresponding impulse response during the block-time interval; selecting a phase identifying the start of the block-time interval from the correlated complex samples; estimating an equalizer filter using the set of predetermined symbols and an initial data field synchronization segment provided at the start of the block-time interval; updating the equalizer filter using subsequent complex samples of the signal to extract a subsequent impulse response and correlate with a reference segment, wherein the reference segment corresponds to either the predetermined symbol sequence or a partial decision feedback segment.
Claim 3
Dependent Claim
26 words
The method of claim 1 , wherein the set of predetermined symbols corresponds to the data field synchronization segment of an ATSC digital television signal system.
Claim 4
Dependent Claim
25 words
The method of claim 1 , wherein the updating of the equalizer filter occurs continuously once the equalizer is estimated and the signal remains synchronized.
Claim 5
Dependent Claim
31 words
The method of claim 1 , wherein the partial decision feedback segment used to update the equalizer filter is derived by estimating the sign-bit of symbols being transmitted in the signal.
Claim 6
Dependent Claim
36 words
The method of claim 1 , wherein the reference segment used to update the equalizer is set to the predetermined symbol sequence when a subsequent data field synchronization segment is transmitted in the subsequent impulse response.
Claim 7
Dependent Claim
38 words
The method of claim 1 , wherein the reference segment used to update the equalizer is set to the partial decision feedback segment when a subsequent data field synchronization segment is not transmitted in the subsequent impulse response.
Claim 8
Independent Claim
186 words
An apparatus for equalizing a signal received over a broadcast system, comprising: a predetermined symbol section that stores a set of predetermined symbols corresponding to symbols in a data field synchronization segment of a data field having a plurality of segments wherein a data frame having at least two of these data fields is transmitted over the signal in the broadcast system during a block-time interval; a partial decision feedback section that estimates the sign-bits for symbols transmitted in the signal; a complex correlator that correlates complex samples of the signal with the set of predetermined symbols to extract a corresponding impulse response during the block-time interval and determines the phase identifying the start of the block-time interval; and an estimator that estimates the equalizer using the set of predetermined symbols with an initial data field synchronization provided at the start of the block-time interval and subsequently updates the equalizer using subsequent complex samples of the signal to extract a subsequent impulse response and correlate with reference segment, wherein the reference segment corresponds to either the set of predetermined symbols or a partial decision feedback segment.
Claim 9
Independent Claim
186 words
An apparatus for equalizing a signal received over a broadcast system, comprising: a predetermined symbol section that stores a set of predetermined symbols corresponding to symbols in a data field synchronization segment of a data field having a plurality of segments wherein a data frame having at least two of these data fields is transmitted over the signal in the broadcast system during a block-time interval; a partial decision feedback section that estimates the sign-bits for symbols transmitted in the signal; a complex correlator that correlates complex samples of the signal with the set of predetermined symbols to extract a corresponding impulse response during the block-time interval and determines the phase identifying the start of the block-time interval; and an estimator that estimates the equalizer using the set of predetermined symbols with an initial data field synchronization provided at the start of the block-time interval and subsequently updates the equalizer using subsequent complex samples of the signal to extract a subsequent impulse response and correlate with reference segment, wherein the reference segment corresponds to either the set of predetermined symbols or a partial decision feedback segment.
Claim 10
Dependent Claim
26 words
The apparatus of claim 7 , wherein the set of predetermined symbols corresponds to a data field synchronization segment in an ATSC digital television signal system.
Claim 11
Dependent Claim
27 words
The apparatus of claim 7 , wherein the complex correlator and estimator update the equalizer filter continuously once the equalizer is initialized and the signal remains synchronized.
Claim 12
Dependent Claim
30 words
The apparatus of claim 7 , wherein the partial decision feedback segment used to update the equalizer filter is derived by estimating the sign-bit of symbols transmitted in the signal.
Claim 13
Dependent Claim
36 words
The apparatus of claim 7 , wherein the reference segment used to update the equalizer is set to the predetermined symbol sequence when a subsequent data field synchronization segment is transmitted in the subsequent impulse response.
Claim 14
Dependent Claim
38 words
The apparatus of claim 7 , wherein the reference segment used to update the equalizer is set to the partial decision feedback segment when a subsequent data field synchronization segment is not transmitted in the subsequent impulse response.
Claim 15
Independent Claim
178 words
An apparatus for performing equalization on a signal received over a broadcast system and acquired, comprising: means for providing a set of predetermined symbols that correspond to symbols in a data field synchronization segment of a data field having a plurality of segments wherein a data frame having at least two of these data fields is transmitted over the signal in the broadcast system during a block-time interval; means for correlating complex samples of the signal with the set of predetermined symbols to extract a corresponding impulse response during the block-time interval; means for selecting a phase identifying the start of the block-time interval from the correlated complex samples; means for estimating an equalizer filter using the set of predetermined symbols and an initial data field synchronization segment provided at the start of the block-time interval; means for updating the equalizer filter using subsequent complex samples of the signal to extract a subsequent impulse response and correlate with a reference segment, wherein the reference segment corresponds to either the predetermined symbol sequence or a partial decision feedback segment.
Claim 16
Independent Claim
178 words
An apparatus for performing equalization on a signal received over a broadcast system and acquired, comprising: means for providing a set of predetermined symbols that correspond to symbols in a data field synchronization segment of a data field having a plurality of segments wherein a data frame having at least two of these data fields is transmitted over the signal in the broadcast system during a block-time interval; means for correlating complex samples of the signal with the set of predetermined symbols to extract a corresponding impulse response during the block-time interval; means for selecting a phase identifying the start of the block-time interval from the correlated complex samples; means for estimating an equalizer filter using the set of predetermined symbols and an initial data field synchronization segment provided at the start of the block-time interval; means for updating the equalizer filter using subsequent complex samples of the signal to extract a subsequent impulse response and correlate with a reference segment, wherein the reference segment corresponds to either the predetermined symbol sequence or a partial decision feedback segment.
Claim 17
Dependent Claim
185 words
Apparatus comprising a computer-readable storage medium tangibly embodying program instructions for performing equalization on a signal received over a broadcast system, the program instructions including instructions operable to cause a programmable process to: provide a set of predetermined symbols that correspond to symbols in a data field synchronization segment of a data field having a plurality of segments wherein a data frame having at least two of these data fields is transmitted over the signal in the broadcast system during a block-time interval; correlate complex samples of the signal with the set of predetermined symbols to extract a corresponding impulse response during the block-time interval; select a phase identifying the start of the block-time interval from the correlated complex samples; estimate an equalizer filter using the set of predetermined symbols and an initial data field synchronization segment provided at the start of the block-time interval; update the equalizer filter using subsequent complex samples of the signal to extract a subsequent impulse response and correlate with a reference segment, wherein the reference segment corresponds to either the predetermined symbol sequence or a partial decision feedback segment.
Claim 18
Dependent Claim
185 words
Apparatus comprising a computer-readable storage medium tangibly embodying program instructions for performing equalization on a signal received over a broadcast system, the program instructions including instructions operable to cause a programmable process to: provide a set of predetermined symbols that correspond to symbols in a data field synchronization segment of a data field having a plurality of segments wherein a data frame having at least two of these data fields is transmitted over the signal in the broadcast system during a block-time interval; correlate complex samples of the signal with the set of predetermined symbols to extract a corresponding impulse response during the block-time interval; select a phase identifying the start of the block-time interval from the correlated complex samples; estimate an equalizer filter using the set of predetermined symbols and an initial data field synchronization segment provided at the start of the block-time interval; update the equalizer filter using subsequent complex samples of the signal to extract a subsequent impulse response and correlate with a reference segment, wherein the reference segment corresponds to either the predetermined symbol sequence or a partial decision feedback segment.
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| 3.5 Years (Year 4) | 2006-05-05 | 2006-11-04 | 2007-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-05-05 | 2010-11-04 | 2011-05-06 | $3760.00 | Window Closed / Lapsed |
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