Frequency error detection apparatus and method based on...

Details Frequency error detection apparatus and method based on... Frequency error detection apparatus and method based on...

2006-05-09

2006-05-09

Wachsman, Hal (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

C702S075000, C702S180000, C702S069000, C702S189000, C324S076240, C324S076410, C324S076420

Reexamination Certificate

active

07043383

ABSTRACT:
A frequency error detection apparatus and method based on histogram information of an input signal. The apparatus includes an A/D converter for and converting an analog signal into digital values; a zero crossing point detector for detecting sign changes of the digital values, and detecting zero crossing points; a period information detector for detecting period information which is the number of the digital values corresponding to a periodic signal; a histogram information calculator for counting the number of detections for the respective period information based on the period information, and calculating error-detection-target histogram information; and a frequency error calculator for detecting a difference between the error-detection-target histogram information and a reference histogram information, and calculating a frequency error value based on the difference. This can shorten time for frequency error detections and improve accuracy of the detected frequency error value.

REFERENCES:
patent: 4166980 (1979-09-01), Apostolos et al.
patent: 6598004 (2003-07-01), Ishida et al.
patent: 6931335 (2005-08-01), Mueller
Hsue et al., “Automatic modulation recognition of digitally modulated signals”, Oct. 15-18, 1989, IEEE, Military Communications Conference, 1989, vol. 3, pp. 645-649.

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