US5115452A
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US
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Phase jitter correction arrangement
Assignee: Nokia Bell Labs
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Filing: 1990-08-02
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Granted: 1992-05-19
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Expires: 2010-08-02
Abstract
Abstract In a communications system, a transmitted signal is typically impaired by phase jitter attributed to power line harmonics and ringing voltages present in a communications channel. In order to properly recover the transmitted signal, the phase jitter in a received signal needs to be eliminated. To this end, an infinite-impulse-response (IIR) filter arrangement is employed in a receiver to estimate the phase jitter and is followed by a demodulator which substantially removes the jitter based on the estimate. The transfer function of this IIR filter arrangement is a function of the autocorrelation of a phase error, the latter being indicative of the difference between the phase jitter in the received signal and the jitter estimate.
Inventors
- 👤 Robert L. Cupo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:07
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/20; H04L1/205
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
73 words
Apparatus for estimating phase jitter in a received signal, said apparatus comprising means for receiving a phase error signal which is representative of a difference between said phase jitter and an estimate thereof, and means for forming said estimate in response to said phase error signal, said forming means having an impulse response of infinite duration and also having a transfer function which is determined by an autocorrelation of said phase error signal.
Claim 2
Dependent Claim
73 words
Apparatus for estimating phase jitter in a received signal, said apparatus comprising means for receiving a phase error signal which is representative of a difference between said phase jitter and an estimate thereof, and means for forming said estimate in response to said phase error signal, said forming means having an impulse response of infinite duration and also having a transfer function which is determined by an autocorrelation of said phase error signal.
Claim 3
Dependent Claim
78 words
Receiver apparatus for processing a signal which includes phase jitter, said receiver apparatus comprising means for generating a phase error indicative of a difference between said phase jitter and an estimate thereof, means for providing said estimate, said providing means having an impulse response of infinite duration and also having a transfer function which is determined by an autocorrelation of said phase error, and means for removing said phase jitter from said signal in response to said estimate.
Claim 4
Dependent Claim
78 words
Receiver apparatus for processing a signal which includes phase jitter, said receiver apparatus comprising means for generating a phase error indicative of a difference between said phase jitter and an estimate thereof, means for providing said estimate, said providing means having an impulse response of infinite duration and also having a transfer function which is determined by an autocorrelation of said phase error, and means for removing said phase jitter from said signal in response to said estimate.
Claim 5
Dependent Claim
25 words
The apparatus of claim 2 wherein said removing means further includes means for demodulating said signal using said phase jitter estimate as a carrier frequency.
Claim 6
Dependent Claim
15 words
The apparatus of claim 2 wherein said transfer function is determined using a recursive technique.
Claim 7
Dependent Claim
15 words
The apparatus of claim 2 wherein said providing means is realized as a lattice structure.
Claim 8
Dependent Claim
98 words
Apparatus for receiving a signal, said apparatus comprising means for demodulating samples of said signal which include phase jitter, said demodulating means using an estimate of said phase jitter as a carrier frequency so that said phase jitter is removed from said samples, and means for providing said estimate in response to a phase error signal, said providing means having an impulse response of infinite duration and also having a transfer function which is a function of an autocorrelation of a phase error, said phase error being indicative of a difference between said estimate and said phase jitter.
Claim 9
Dependent Claim
98 words
Apparatus for receiving a signal, said apparatus comprising means for demodulating samples of said signal which include phase jitter, said demodulating means using an estimate of said phase jitter as a carrier frequency so that said phase jitter is removed from said samples, and means for providing said estimate in response to a phase error signal, said providing means having an impulse response of infinite duration and also having a transfer function which is a function of an autocorrelation of a phase error, said phase error being indicative of a difference between said estimate and said phase jitter.
Claim 10
Dependent Claim
15 words
The apparatus of claim 6 wherein said transfer function is determined using a recursive technique.
Claim 11
Dependent Claim
15 words
The apparatus of claim 6 wherein said providing means is realized as a lattice structure.
Claim 12
Dependent Claim
108 words
A communications system having a transmitter which transmits a signal, said communications system comprising means for recovering said signal based on samples of a received signal associated with said signal, said samples including phase jitter, means for generating an estimate of said phase jitter in response to a received signal sample, said generating means having an impulse response of infinite duration and also having a transfer function which is a function of an autocorrelation of a phase error, said phase error being indicative of a difference between said estimate and said phase jitter, and means for removing said phase jitter from said samples in response to said estimate.
Claim 13
Dependent Claim
108 words
A communications system having a transmitter which transmits a signal, said communications system comprising means for recovering said signal based on samples of a received signal associated with said signal, said samples including phase jitter, means for generating an estimate of said phase jitter in response to a received signal sample, said generating means having an impulse response of infinite duration and also having a transfer function which is a function of an autocorrelation of a phase error, said phase error being indicative of a difference between said estimate and said phase jitter, and means for removing said phase jitter from said samples in response to said estimate.
Claim 14
Dependent Claim
24 words
The communications system of claim 9 wherein said removing means further includes means for demodulating said samples using said estimate as a carrier frequency.
Claim 15
Dependent Claim
16 words
The communications system of claim 9 wherein said transfer function is determined using a recursive technique.
Claim 16
Dependent Claim
16 words
The communications system of claim 9 wherein said generating means is realized as a lattice structure.
Claim 17
Independent Claim
66 words
A method for estimating phase jitter in a received signal, said method comprising the steps of receiving a phase error signal which is representative of a difference between said phase jitter and an estimate thereof, and forming said estimate using a filter having an impulse response of infinite duration and also having a transfer function which is determined by an autocorrelation of said phase error signal.
Claim 18
Independent Claim
66 words
A method for estimating phase jitter in a received signal, said method comprising the steps of receiving a phase error signal which is representative of a difference between said phase jitter and an estimate thereof, and forming said estimate using a filter having an impulse response of infinite duration and also having a transfer function which is determined by an autocorrelation of said phase error signal.
Claim 19
Independent Claim
77 words
A method for use in receiver apparatus for processing a signal which includes phase jitter, said method comprising the steps of generating a phase error indicative of a difference between said phase jitter and an estimate thereof, providing said estimate using a filter whose impulse response has an infinite duration and whose transfer function is a function of an autocorrelation of said phase error, and removing said phase jitter from said signal in response to said estimate.
Claim 20
Independent Claim
77 words
A method for use in receiver apparatus for processing a signal which includes phase jitter, said method comprising the steps of generating a phase error indicative of a difference between said phase jitter and an estimate thereof, providing said estimate using a filter whose impulse response has an infinite duration and whose transfer function is a function of an autocorrelation of said phase error, and removing said phase jitter from said signal in response to said estimate.
Claim 21
Dependent Claim
25 words
The method of claim 14 wherein said removing step includes the step of demodulating said signal using said phase jitter estimate as a carrier frequency.
Claim 22
Dependent Claim
15 words
The method of claim 14 wherein said transfer function is determined using a recursive technique.
Claim 23
Dependent Claim
14 words
The method of claim 14 wherein said filter is realized as a lattice structure.
Claim 24
Independent Claim
108 words
A method for use in signal-receiving apparatus, said method comprising the steps of demodulating first and second samples of said signal which include phase jitter, said first sample preceding said second sample in time, said demodulating means using an estimate of said phase jitter as a carrier frequency so that said phase jitter is removed from said second sample, and providing said estimate in response to the first sample using a filter whose impulse response has an infinite duration and whose transfer function is a function of an autocorrelation of a phase error, said phase error being indicative of a difference between said estimate and said phase jitter.
Claim 25
Independent Claim
108 words
A method for use in signal-receiving apparatus, said method comprising the steps of demodulating first and second samples of said signal which include phase jitter, said first sample preceding said second sample in time, said demodulating means using an estimate of said phase jitter as a carrier frequency so that said phase jitter is removed from said second sample, and providing said estimate in response to the first sample using a filter whose impulse response has an infinite duration and whose transfer function is a function of an autocorrelation of a phase error, said phase error being indicative of a difference between said estimate and said phase jitter.
Claim 26
Dependent Claim
15 words
The method of claim 18 wherein said transfer function is determined using a recursive technique.
Claim 27
Dependent Claim
14 words
The method of claim 18 wherein said filter is realized as a lattice structure.
Claim 28
Independent Claim
106 words
A method for use in a communications system having a transmitter which transmits a signal, said method comprising the steps of recovering said signal based on samples of a received signal associated with said signal, said samples including phase jitter, generating an estimate of said phase jitter in response to a received signal sample using a filter whose impulse response has an infinite duration and whose transfer function is a function of an autocorrelation of a phase error, said phase error being indicative of a difference between said estimate and said phase jitter, and removing said phase jitter from said samples in response to said estimate.
Claim 29
Independent Claim
106 words
A method for use in a communications system having a transmitter which transmits a signal, said method comprising the steps of recovering said signal based on samples of a received signal associated with said signal, said samples including phase jitter, generating an estimate of said phase jitter in response to a received signal sample using a filter whose impulse response has an infinite duration and whose transfer function is a function of an autocorrelation of a phase error, said phase error being indicative of a difference between said estimate and said phase jitter, and removing said phase jitter from said samples in response to said estimate.
Claim 30
Dependent Claim
24 words
The method of claim 21 wherein said removing step further includes the step of demodulating said samples using said estimate as a carrier frequency.
Claim 31
Dependent Claim
15 words
The method of claim 21 wherein said transfer function is determined using a recursive technique.
Claim 32
Dependent Claim
14 words
The method of claim 21 wherein said filter is realized as a lattice structure.
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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) | 1995-05-19 | 1995-11-18 | 1996-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-19 | 1999-11-18 | 2000-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-19 | 2003-11-18 | 2004-05-19 | $7700.00 | Window Closed / Lapsed |