Apparatus and a method for calculation of a correlation...

Details Apparatus and a method for calculation of a correlation... Apparatus and a method for calculation of a correlation...

2006-06-06

2006-06-06

Tse, Young T. (Department: 2637)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C375S142000, C375S150000

Reexamination Certificate

active

07058143

ABSTRACT:
To provide an apparatus for calculation of correlation that can take a correlation even when a frequency error is relatively large. With a 0-th degree correlator for taking, to output, a correlation between a reference signal and a measurement signal, an n-th degree correlator including an ejwtmultiplier of calculating a frequency component addition signal having a frequency component added to the reference signal, and a correlation calculator for taking, to output, a correlation between the frequency component addition signal and the measurement signal, and an adder for adding an output of the 0-th degree correlator and an output of the n-th degree correlator and the output of the n-th degree correlator added at the adder do not have an increased noise/correlation value ratio, even when a frequency error is large. Accordingly, a correlation can be taken even with an increased frequency error. Another embodiment includes a conceptual block diagram in which a symbol D(o) is multiplied by a frequency.

REFERENCES:
patent: 5822365 (1998-10-01), Lee
patent: 6137773 (2000-10-01), Stilwell et al.
patent: 6298227 (2001-10-01), Molnar
patent: 6560298 (2003-05-01), Froehling et al.
patent: 0162831 (1998-12-01), None
patent: 0186590 (1999-05-01), None

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