Unique word detection apparatus
AssigneeNEC Corporation
InventorsHiroki Tsuda, Hizuru Nawata
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Abstract
A unique word detection apparatus for detecting a unique word out of a demodulated signal resulting from the demodulation of a burst signal consisting of a carrier recovery section, a bit timing recovery section, a unique word section and a data section. The magnitude of the D.C. component of the demodulated signal is extracted, and the timing of the transition of this D.C. component from large to small is detected. An aperture signal designating the period in which to detect the unique word on the basis of the transition timing of the D.C. component generated, and the unique word out of the demodulated signal entered during the period designated by the aperture signal is accurately detected.
Claims4
A unique word detection apparatus for detecting a unique word out of a demodulated signal resulting from the demodulation by a demodulator, of a burst signal consisting of a carrier recovery section, a bit timing recovery section, a unique word section and a data section, comprising:
- D.C. component extracting means for extracting the D.C. component of said demodulated signal;
- first detecting means for detecting a transition timing to said bit timing recovery section from the output of said D.C. component extracting means and for generating a timing signal;
- means for generating an aperture signal with which to estimate the position of the unique word contained in said demodulated signal on the basis of said timing signal;
- and
- second detecting means for detecting the unique word out of said demodulated signal on the basis of said aperture signal.
Dependencies are inferred from the claim text.