Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1983-02-28
1985-05-14
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
371 47, H04L 700
Patent
active
045176825
ABSTRACT:
In an apparatus for synchronizing received binary signals, the duration of each bit of the received signals to be synchronized is an integral multiple n of the duration of an original bit, and each original bit has a reception quality factor which is stored in time succession, in respect of the individual original bits, in a common quality factor memory. Quality factor differences of successive original bits are formed by means of a differencing means, and the quality factor differences of those original bits which have the same serial number within a reception bit are added by means of adding circuit. The maximum of the summed quality factor differences of n successive original bits is determined by means of a maximum decision circuit. The addresses of the original bits are continuously adapted in such a way that that of the original bit having the maximum summed quality factor difference receives a given, constant and predetermined value. That original bit is then subsequently used as a first original bit of a reception bit, for synchronization.
REFERENCES:
patent: 3665396 (1972-05-01), Forney, Jr.
patent: 4059825 (1977-11-01), Greene
patent: 4412329 (1983-10-01), Yarborough, Jr.
LGZ Landis & Gyr Zug AG
Marmorek Ernest F.
Safourek Benedict V.
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