Invalidity dossier
US 7826567
Method and apparatus for coarse and fine frequency and timing synchronisation
Current assignee: E2e Systems LLC
Added 10/31/2026, 4:01:08 AM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
US 7,826,567 B2 — Patent Overview
Title: Method and apparatus for coarse and fine frequency and timing synchronisation
Patent number / application: US 7,826,567 B2; Application US 10/563,926
Dates (per supplied page; priority date is noted on the page as an assumption):
- Priority date: 2003-07-11
- Filing date: 2004-07-06
- Publication of US 2006/0233288 A1: 2006-10-19
- Grant/publication of US 7,826,567 B2: 2010-11-02
- Adjusted expiration (as listed): 2028-02-21
Assignees (as listed on the supplied page): Original assignee NXP B.V.; current assignee E2E Systems LLC. (The page also lists later reassignments; these are reported only as page data, not analyzed.)
Inventors: Paulus Wilhelmus Franciscus Gruijters; Lucas Hendrikus Gerardus Tan
Purpose and plain-language scope (from the excerpt):
The invention concerns a receiver for receiving frequency signals (examples given: wireless modems, wireless interfaces for wireless networks). The stated problem is that time synchronization is difficult in multipath and/or high-noise environments and is relatively inaccurate in the prior art. The receiver uses a two-step time synchronization: a coarse time synchronization based on one or more autocorrelations, and a fine time synchronization based on one or more crosscorrelations. Because the coarse and fine steps use different correlations and the fine step does not reuse the coarse step's results, the two steps are independent and accuracy is said to improve. Autocorrelation is said to give more reliable coarse results than crosscorrelation.
Described embodiments also include: coarse frequency synchronization by detecting and accumulating phases of samples of a further group of preamble symbols; fine frequency synchronization using phases of samples of another group following that group; automatic gain control performed digitally after coarse time synchronization and before coarse frequency synchronization; and hardware detail such as an autocorrelating unit, integrating unit, delaying units, scaling unit, deciding unit, and logical units.
What the excerpt does not establish: It is marked "[Excerpt only]" and omits text (e.g., the full claim set, the rest of the sixth embodiment, and most dependent claims). Therefore claim scope, claim count, and the complete specification cannot be confirmed from this excerpt.
Generated 10/31/2026, 4:01:23 AM
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Litigation summary
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PTAB challenges
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Assignment history
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Prior art
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Obviousness
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Extensions
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Derivative works
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