Frame guard system

Details Frame guard system Frame guard system

1992-03-13

1994-04-12

Kuntz, Curtis

Pulse or digital communications

Spread spectrum

Direct sequence

375116, 3701051, 3701054, H04L 700

Patent

active

053032705

ABSTRACT:
A frame guard system comprises forward and backward guard circuits respectively having different guard stage numbers. A time after output of a frame alignment signal until first arrival of a pseudo out-of-frame signal is measured and the guard stage number of the forward guard circuit is switched in accordance with the measured time; whereas, a time after stoppage of the output of the frame alignment signal until first arrival of a pseudo synchronization signal is measured and the guard stage number of the backward guard circuit is switched in accordance with the measured time. In this way, since the respective guard stage numbers of the forward and backward guard circuits can be changed depending on a situation, the out-of-frame state after the determination of the synchronization can be prevented and thus a stable communication can be realized at all times.

REFERENCES:
patent: 4748623 (1988-05-01), Fujimoto
patent: 4965814 (1990-10-01), Yoshida et al.
patent: 5014272 (1991-05-01), Yoshida

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