Unique word detection apparatus

Pulse or digital communications – Spread spectrum – Direct sequence

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375116, 3701054, H04L 700

Patent

active

052068870

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.

REFERENCES:
patent: 4686672 (1987-08-01), Namiki
patent: 5012491 (1991-04-01), Iwasaki

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