US5878090A
Expired / Lapsed
US
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Receiver synchronization using punctured preamble
Assignee: OL Security LLC
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Filing: 1998-01-21
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Granted: 1999-03-02
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Expires: 2018-01-21
Abstract
Abstract A receiver carrier synchronization apparatus and method for carrier synchronization with a received signal having a known data pattern preamble uses a "punctured" preamble for making carrier synchronization estimates thereby reducing the number of receivers required. The known data pattern preamble of the received signal is processed with a local reference signal and a differentiated replica of the known data pattern preamble to generate an error signal. The error signal is selectively sampled in the time domain in accordance with a puncture scheme, and the sampled error signal is used to generate the local reference signal in a closed loop. The received signal is processed with the local reference signal and a replica of the known data pattern preamble to generate a synchronization estimate signal.
Inventors
- 👤 Donald R. Stephens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:36
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/18; H04L27/22; H04L27/227; H04L27/2271; H04L27/2272; H03; H03J; H03J7/00; H03J7/02; H04L27/233; H04L7/00; H04L7/04; H04L7/041
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
176 words
Apparatus for generating a synchronization estimate signal for carrier synchronization of a received signal having a known data pattern preamble, comprising: a data pattern generator for generating a replica of the known data pattern preamble; a received signal processor for combining the known data pattern preamble of the received signal with a local reference signal and with a differentiated replica of the known data pattern preamble to generate an error signal relating to the local reference signal and the known data pattern preamble of the received signal; a puncture processor for puncturing a portion of the error signal to selectively sample the error signal according to the puncture pattern and generating a punctured signal; a signal generator responsive to the punctured signal for generating the local reference signal; and a synchronization processor responsive to the combination of the known data pattern preamble of the received signal with the local reference signal for combining with a replica of the known data pattern preamble to generate a synchronization estimate signal relating to the synchronization of the received signal.
Claim 2
Dependent Claim
176 words
Apparatus for generating a synchronization estimate signal for carrier synchronization of a received signal having a known data pattern preamble, comprising: a data pattern generator for generating a replica of the known data pattern preamble; a received signal processor for combining the known data pattern preamble of the received signal with a local reference signal and with a differentiated replica of the known data pattern preamble to generate an error signal relating to the local reference signal and the known data pattern preamble of the received signal; a puncture processor for puncturing a portion of the error signal to selectively sample the error signal according to the puncture pattern and generating a punctured signal; a signal generator responsive to the punctured signal for generating the local reference signal; and a synchronization processor responsive to the combination of the known data pattern preamble of the received signal with the local reference signal for combining with a replica of the known data pattern preamble to generate a synchronization estimate signal relating to the synchronization of the received signal.
Claim 3
Dependent Claim
40 words
Apparatus for generating a synchronization estimate signal as set forth in claim 1, wherein said synchronization processor includes: a synchronization puncture processor for puncturing the synchronization estimate signal according to the puncture pattern and generating a punctured synchronization estimate signal.
Claim 4
Dependent Claim
39 words
Apparatus for generating a synchronization estimate as set forth in claim 2 including: a data pattern modulus counter responsive to the replica of the known data pattern preamble to generate the puncture pattern to each of the puncture processors.
Claim 5
Independent Claim
161 words
A method for carrier synchronization of a received signal having a known data pattern preamble, comprising the steps of: generating a differentiated replica of the known data preamble pattern of the received signal; combining the received signal having the known data preamble pattern modulated thereon with a local reference signal and the differentiated replica of the known data pattern preamble to generate an error signal relating to the local reference signal and the known data pattern preamble of the received signal; generating a puncture pattern signal to selectively sample the error signal; puncturing the error signal according to the puncture pattern to generate a punctured error signal; generating the local reference signal in response to the punctured error signal; and combining a replica of the known data pattern preamble with the combination of the known data pattern preamble of the receiving signal and the local reference signal to generate a synchronization estimate signal relating to the synchronization of the received signal.
Claim 6
Independent Claim
161 words
A method for carrier synchronization of a received signal having a known data pattern preamble, comprising the steps of: generating a differentiated replica of the known data preamble pattern of the received signal; combining the received signal having the known data preamble pattern modulated thereon with a local reference signal and the differentiated replica of the known data pattern preamble to generate an error signal relating to the local reference signal and the known data pattern preamble of the received signal; generating a puncture pattern signal to selectively sample the error signal; puncturing the error signal according to the puncture pattern to generate a punctured error signal; generating the local reference signal in response to the punctured error signal; and combining a replica of the known data pattern preamble with the combination of the known data pattern preamble of the receiving signal and the local reference signal to generate a synchronization estimate signal relating to the synchronization of the received signal.
Claim 7
Dependent Claim
38 words
The method for carrier synchronization as set forth in claim 4 further comprising the step of: generating a replica of the known data preamble pattern; and generating a puncture pattern in response to the generated data preamble pattern.
Claim 8
Dependent Claim
42 words
The method for carrier synchronization of a received signal as set forth in claim 5 further comprising the step of: differentiating the replica of the known data pattern preamble for combining with the known data preamble pattern and the local reference signal.
Claim 9
Dependent Claim
38 words
The method for carrier synchronization of a received signal as set forth in claim 4 further comprising the step of puncturing the synchronization estimate signal in accordance with the puncture pattern to generate a punctured synchronization estimate signal.
Claim 10
Dependent Claim
38 words
A method for carrier synchronization of a received signal as set forth in claim 5 further including the step of puncturing the synchronization estimate signal according to the generated puncture pattern to generate a punctured synchronization estimate signal.
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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) | 2002-03-01 | 2002-08-31 | 2003-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-03-01 | 2006-08-31 | 2007-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-03-01 | 2010-08-31 | 2011-03-02 | $7700.00 | Window Closed / Lapsed |