Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1992-05-07
1995-01-31
Chin, Stephen
Pulse or digital communications
Spread spectrum
Direct sequence
375 27, 375122, 3701001, 341143, 348410, H04L 700
Patent
active
053864360
ABSTRACT:
In a synchronization system for use in a digital transmission system in which an encoded digital transmission signal at least part of bits of which have specific statistic characteristics is transmitted, a digital transmission signal received by a decoder within a digital transmission apparatus at a receiving end is subjected to a decoding processing in units of samples on the basis of a synchronous input signal. The digital transmission apparatus at the receiving end includes a monitor for monitoring internal states of the decoder which vary between a synchronous state and an asynchronous state owing to the statistic characteristics of the digital transmission signal, a synchronization detector for determining whether the digital transmission system is in the synchronous state based on an output of the monitor, and a phase shifter for shifting a relative phase of the digital transmission signal against a synchronous input signal supplied to the decoder, one bit by one on the digital transmission signal in units of samples, in the case that a determination result of the synchronization detector indicates the asynchronous state.
REFERENCES:
patent: 4578800 (1986-03-01), Yasuda et al.
patent: 4592070 (1986-05-01), Chow et al.
patent: 4860313 (1989-08-01), Shpiro
CCITT Recommendations G. 721 and G. 722.
Hijino Keiichiro
Iida Masahisa
Kawada Shin-ichi
Wada Hiroshi
Chin Stephen
Kokusai Denshin Denwa Co. Ltd.
Manzo Edward D.
OKI Electric Industry Co., Ltd.
Ringsred Ted K.
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