US5598419A
Expired / Lapsed
US
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Dynamic synchronization code detection window
Assignee: National Semiconductor Corp
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Filing: 1995-07-17
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Granted: 1997-01-28
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Expires: 2015-07-17
Abstract
Abstract A method and structure for virtually eliminating any false detections of a synchronization code is described which creates a selectable window during which the synchronization code is expected to appear. A coincidental replication of the synchronization code outside the window does not trigger false synchronizations.
Inventors
- 👤 David L. Weigand
- 👤 Charles J. Malek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:18
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/24; H04B7/26; H04B7/2643; H04L; H04L7/00; H04L7/04; H04L7/041; H04L7/046; H04L7/08; H04L7/10
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
128 words
A synchronization method performed by a TDMA communication system, said system transmitting and receiving bursts of serial data within time slots, said method comprising the steps of: comparing received data with a predetermined slot synchronization code; detecting a first match between a received synchronization code and said predetermined synchronization code; dynamically adjusting a size of a time window for detecting a last bit of a subsequently received synchronization code matching said predetermined synchronization code; after said step of dynamically adjusting, detecting a second match between subsequently received data and said predetermined synchronization code; and determining whether a last bit of said data qualifying as said second match occurs within said time window and, if so, synchronizing slot times in said TDMA communication system with said received synchronization code.
Claim 2
Dependent Claim
128 words
A synchronization method performed by a TDMA communication system, said system transmitting and receiving bursts of serial data within time slots, said method comprising the steps of: comparing received data with a predetermined slot synchronization code; detecting a first match between a received synchronization code and said predetermined synchronization code; dynamically adjusting a size of a time window for detecting a last bit of a subsequently received synchronization code matching said predetermined synchronization code; after said step of dynamically adjusting, detecting a second match between subsequently received data and said predetermined synchronization code; and determining whether a last bit of said data qualifying as said second match occurs within said time window and, if so, synchronizing slot times in said TDMA communication system with said received synchronization code.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein said time window is dynamically adjusted to a duration equal to one bit period of said data.
Claim 4
Dependent Claim
23 words
The method of claim 1 wherein said time window is dynamically adjusted to a duration equal to three bit periods of said data.
Claim 5
Dependent Claim
23 words
The method of claim 1 wherein said time window is dynamically adjusted to a duration equal to five bit periods of said data.
Claim 6
Dependent Claim
27 words
The method of claim 1 wherein said time window is selected based upon an amount of time that has elapsed without attempting to detect said synchronization code.
Claim 7
Dependent Claim
25 words
The method of claim 1 wherein said step of dynamically adjusting a size of a time window comprises reducing said size of said time window.
Claim 8
Dependent Claim
25 words
The method of claim 1 wherein said step of dynamically adjusting a size of a time window comprises enlarging said size of said time window.
Claim 9
Dependent Claim
145 words
A synchronization method performed by a TDMA communication system, said system transmitting and receiving bursts of serial data within time slots, said method comprising the steps of: comparing received data with a predetermined slot synchronization code; detecting a match between a received synchronization code and said predetermined synchronization code; dynamically adjusting a size of a time window for detecting a last bit of a subsequently received synchronization code matching said predetermined synchronization code; detecting a received synchronization code whose last bit occurs within said time window and, in response to such detection, synchronizing slot times in said TDMA communication system with said received synchronization code; and repeating said steps of dynamically adjusting a size of said time window and detecting said received synchronization code while dynamically adjusting a size of said time window by incremental amounts until said time window is of a desired duration.
Claim 10
Dependent Claim
145 words
A synchronization method performed by a TDMA communication system, said system transmitting and receiving bursts of serial data within time slots, said method comprising the steps of: comparing received data with a predetermined slot synchronization code; detecting a match between a received synchronization code and said predetermined synchronization code; dynamically adjusting a size of a time window for detecting a last bit of a subsequently received synchronization code matching said predetermined synchronization code; detecting a received synchronization code whose last bit occurs within said time window and, in response to such detection, synchronizing slot times in said TDMA communication system with said received synchronization code; and repeating said steps of dynamically adjusting a size of said time window and detecting said received synchronization code while dynamically adjusting a size of said time window by incremental amounts until said time window is of a desired duration.
Claim 11
Dependent Claim
23 words
The method of claim 8 wherein said time window is dynamically adjusted to a duration equal to one bit period of said data.
Claim 12
Dependent Claim
23 words
The method of claim 8 wherein said time window is dynamically adjusted to a duration equal to three bit periods of said data.
Claim 13
Dependent Claim
23 words
The method of claim 8 wherein said time window is dynamically adjusted to a duration equal to five bit periods of said data.
Claim 14
Dependent Claim
27 words
The method of claim 8 wherein said time window is selected based upon an amount of time that has elapsed without attempting to detect said synchronization code.
Claim 15
Dependent Claim
25 words
The method of claim 8 wherein said step of dynamically adjusting a size of a time window comprises reducing said size of said time window.
Claim 16
Dependent Claim
25 words
The method of claim 8 wherein said step of dynamically adjusting a size of a time window comprises enlarging said size of said time window.
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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) | 2000-01-28 | 2000-07-29 | 2001-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-01-28 | 2004-07-29 | 2005-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-01-28 | 2008-07-29 | 2009-01-28 | $7700.00 | Window Closed / Lapsed |