Adaptive timing

Details Adaptive timing Adaptive timing

1988-06-20

1990-10-23

Olms, Douglas W.

Pulse or digital communications

Spread spectrum

Direct sequence

370103, H04L 704

Patent

active

049658115

ABSTRACT:
In some digital communications systems, such as the Integrated Services Digital Network (ISDN), problems may occur in recovering timing from signals generated by several terminals located varying distances from a common transmitter. Timing recovery is facilitated by detecting a marker of a frame transmitted to the several terminal equipments, detecting a corresponding marker receives shortly afterwards from one of the terminal equipments; and sampling the received digital signal at a sampling instant delayed relative to a specific feature of the received marker, for example, a zero crossing immediately following a frame bit. Preferably, the delay between the sampling instant and the occurrence of the specific feature used as a reference point is proportional to the time elapsed between detection of the outgoing or transmitted marker and detection of the incoming or received marker and hence proportional to the round trip propagation time.

REFERENCES:
patent: 3588703 (1971-06-01), Sorkin
patent: 3603932 (1971-09-01), Kerr et al.
patent: 4494211 (1985-01-01), Schwartz
patent: 4602375 (1986-07-01), Inukai
patent: 4653049 (1987-03-01), Shinmyo
patent: 4682327 (1987-07-01), Okumura et al.
patent: 4757521 (1988-07-01), Korsky et al.
Circuit Design and Transmission Performance for ISDN Basic Interfce, Okumura, Yamamoto and Kuribayashi: NTT Electrical Communications Laboratories, pp. 1651-1655.
A New Phase-Locked Oscillator Adaptable to Input Signals with Periodical Phase Jumps, Okumura, Hayashi and Inoue: Proceedings of ISCAS 85, pp. 599-602.

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