Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1986-08-12
1989-02-21
Griffin, Robert L.
Pulse or digital communications
Spread spectrum
Direct sequence
375 4, 371 61, H04L 700
Patent
active
048072575
ABSTRACT:
A sampled synchronous transmission signal Vt is represented by a series of samples J at equidistant sampling instants. A computing circuit 5 computes the positions R of the sampling instants relative to the rising edges of a virtual reference clock Cref which is phase-locked to the channel clock. For each sampling instant the position R is determined on the basis of the position R of a preceding sampling instant and a measure Q of the difference in time between the sampling interval T and the period L of the virtual reference clock Cref. From the values of the successive samples J an interpolation circuit 2 derives the positions N of the detection-level crossings by the transmission signal Vt, which crossings represent a fixed phase position of the channel clock. After each detection-level crossing the measure Q of the time difference is corrected by circuit 3 and 4, depending on the difference between the positions N and R. A data recovery circuit arrangement recovers the data depending on the values determined for the positions R.
REFERENCES:
patent: 4295222 (1981-10-01), Van Uffelen
patent: 4312075 (1982-01-01), Murano et al.
patent: 4376309 (1983-03-01), Fenderson et al.
patent: 4416017 (1983-11-01), Jasper et al.
patent: 4558422 (1985-12-01), Den Beste et al.
Kahlman Josephus A. H. M.
Schouhamer Immink Kornelis A.
Barschall Anne E.
Briody Thomas A.
Chin Stephen
Griffin Robert L.
Haken Jack E.
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