Pulse or digital communications – Receivers – Automatic frequency control
Reexamination Certificate
2007-03-06
2007-03-06
Kim, Kevin (Department: 2611)
Pulse or digital communications
Receivers
Automatic frequency control
C375S257000
Reexamination Certificate
active
09974332
ABSTRACT:
The invention performs frequency estimation over both the burst preamble, during which known symbols are transmitted, and also during the burst's data packet, which is subsequent to the preamble and extracted by the local detector. During the preamble, an initial frequency estimate is obtained. This estimate is based on a time average of either phase or correlation samples. Atypical phase or correlation samples, attributable to detector symbol errors during the data packet, are detected and filtered, so as to avoid including the atypical samples in a time-averages used to provide the frequency estimate. In a first embodiment correlation samples are time averaged, and atypical correlation samples are suppressed prior to correlation time averaging. In a second embodiment, phase slope values are time averaged, and atypical values of phase slope are suppressed prior to phase slope time averaging.
REFERENCES:
patent: 5867539 (1999-02-01), Koslov
patent: 6052419 (2000-04-01), Hioki
patent: 0 681 386 (1995-11-01), None
patent: 0 692 896 (1996-01-01), None
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European Patent Office, European Search Report, Application No. 01400495.6, Sep. 13, 2001.
Harrity & Snyder LLP
Juniper Networks, Inc.
Kim Kevin
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