Synchronization word detection apparatus

Details Synchronization word detection apparatus Synchronization word detection apparatus

1990-12-06

1991-12-17

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

36471511, 36472411, H04L 704

Patent

active

050739069

ABSTRACT:
A synchronization (sync) word detection apparatus which, on receiving a signal in which a sync word having a predetermined length (N) is inserted beforehand, detects the sync word out of a demodulated and soft-decided sequence of the received signal. A cross correlator (4) calculates a cross correlation value of the soft-decided and demodulated sequence fed thereto and the sync word. A threshold generating section (1, 2, 3) determines a means power of the demodulated and soft-decided sequence and generates a threshold value on the basis of the mean power. A comparing circuit (5) produces a detection signal when the cross correlation exceeds the threshold value. The apparatus reduces the false detection probability and misdetection prbability even when the receive field intensity sharply changes on a transmission path.

REFERENCES:
patent: 3303335 (1967-02-01), Pryor
patent: 4001693 (1977-01-01), Stackhouse et al.
patent: 4633426 (1986-12-01), Venier
patent: 4847877 (1989-07-01), Besseyre
William W. Wu, "Elements of Digital Satellite Communication", vol. I, Computer Science Press, Inc. (1984) 5.9-5.10.

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