Patent US5852630A successfully refreshed from Google Patents.
US5852630A
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Method and apparatus for a RADSL transceiver warm start activation procedure with precoding
Assignee: Ikanos Communications Inc
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Filing: 1998-03-30
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Granted: 1998-12-22
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Expires: 2018-03-30
Abstract
Abstract A DSL communication device wherein the state of component coefficients are saved in a memory of a DSL device so that at a later time, the DSL device may initiate a warm start activation sequence wherein the last known channel parameters are used to train the equalizer, significantly reducing the amount of equalizer training required by eliminating the requirement that the aforementioned coefficients be transferred between DSL devices.
Inventors
- 👤 Ehud Langberg
- 👤 William Scholtz
- 👤 Farooq Jabbar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:13
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/26; H04L27/2601; H04L27/2647; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L2025/03592; H04L2025/03598; H04L2025/03611; H04L2025/03656; H04L2025/03668
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
96 words
A method for providing a shortened warm-start training sequence for a transceiver that is communicating data with another transceiver, comprising the steps of: processing a request to enter a standby mode, saving the state of a precoder at a transmitter; saving the state of an equalizer at a receiver; receiving a request to exit the standby mode and resume data transmission; restoring the saved precoder state to the precoder; restoring the saved equalizer state to the equalizer; performing a shortened training sequence to ascertain the correct phase of a communication channel; and adjusting the equalizer accordingly.
Claim 2
Independent Claim
96 words
A method for providing a shortened warm-start training sequence for a transceiver that is communicating data with another transceiver, comprising the steps of: processing a request to enter a standby mode, saving the state of a precoder at a transmitter; saving the state of an equalizer at a receiver; receiving a request to exit the standby mode and resume data transmission; restoring the saved precoder state to the precoder; restoring the saved equalizer state to the equalizer; performing a shortened training sequence to ascertain the correct phase of a communication channel; and adjusting the equalizer accordingly.
Claim 3
Dependent Claim
26 words
The method as defined in claim 1, wherein the step of saving the state of said precoder and said equalizer includes saving coefficients to a memory.
Claim 4
Dependent Claim
36 words
The method as defined in claim 1, wherein the step of adjusting said equalizer is performed by generating an error signal, said error signal being the difference between a received signal and an ideal reference signal.
Claim 5
Dependent Claim
22 words
The method as defined in claim 1, further including the step of training a noise predictive filter using a noise estimate signal.
Claim 6
Dependent Claim
34 words
The method as defined in claim 4, wherein said noise estimate signal is generated by adding the received signal having the output of a noise predictive filter subtracted therefrom with an ideal reference signal.
Claim 7
Dependent Claim
59 words
A transceiver apparatus having a transmitter including a precoder and a receiver including an equalizer, the apparatus comprising: means for saving the state of the precoder after training; means for saving the state of the equalizer after training; and means for performing a warm start activation sequence, including means for restoring the state of said precoder and said equalizer.
Claim 8
Dependent Claim
59 words
A transceiver apparatus having a transmitter including a precoder and a receiver including an equalizer, the apparatus comprising: means for saving the state of the precoder after training; means for saving the state of the equalizer after training; and means for performing a warm start activation sequence, including means for restoring the state of said precoder and said equalizer.
Claim 9
Dependent Claim
22 words
The apparatus as defined in claim 6, wherein an awaken signal is used in order to request said warm start activation sequence.
Claim 10
Dependent Claim
34 words
The apparatus as defined in claim 6, further comprising means for adjusting said equalizer by generating an error signal, said error signal being the difference between a received signal and an ideal reference signal.
Claim 11
Dependent Claim
21 words
The apparatus as defined in claim 6, further comprising means for training a noise predictive filter using a noise estimate signal.
Claim 12
Dependent Claim
34 words
The apparatus as defined in claim 9, wherein said noise estimate signal is generated by adding the received signal having the output of a noise predictive filter subtracted therefrom with an ideal reference signal.
Claim 13
Dependent Claim
116 words
A computer readable medium having a program for providing a shortened warm-start training sequence for a transceiver that is communicating data with another transceiver, the program comprising: means for processing a request to enter a standby mode; means for saving the state of a precoder at a transmitter; means for saving the state of an equalizer at a receiver; means for receiving a request to exit the standby mode and resume data transmission; means for restoring the saved precoder state to the precoder; means for restoring the saved equalizer state to the equalizer; means for performing a shortened training sequence to ascertain the correct phase of a communication channel; and means for adjusting the equalizer accordingly.
Claim 14
Dependent Claim
116 words
A computer readable medium having a program for providing a shortened warm-start training sequence for a transceiver that is communicating data with another transceiver, the program comprising: means for processing a request to enter a standby mode; means for saving the state of a precoder at a transmitter; means for saving the state of an equalizer at a receiver; means for receiving a request to exit the standby mode and resume data transmission; means for restoring the saved precoder state to the precoder; means for restoring the saved equalizer state to the equalizer; means for performing a shortened training sequence to ascertain the correct phase of a communication channel; and means for adjusting the equalizer accordingly.
Claim 15
Dependent Claim
26 words
The program as defined in claim 11, wherein said means for saving the state of said precoder and said equalizer includes saving coefficients to a memory.
Claim 16
Dependent Claim
36 words
The program as defined in claim 11, wherein said means for adjusting said equalizer is performed by generating an error signal, said error signal being the difference between a received signal and an ideal reference signal.
Claim 17
Dependent Claim
21 words
The program as defined in claim 1, further including means for training a noise predictive filter using a noise estimate signal.
Claim 18
Dependent Claim
34 words
The program as defined in claim 14, wherein said noise estimate signal is generated by adding the received signal having the output of a noise predictive filter subtracted therefrom with an ideal reference signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-12-21 | 2002-06-22 | 2002-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-12-21 | 2006-06-22 | 2006-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-12-21 | 2010-06-22 | 2010-12-22 | $7700.00 | Window Closed / Lapsed |