Process for synchronizing a receiver switching circuit to a rece

Details Process for synchronizing a receiver switching circuit to a rece Process for synchronizing a receiver switching circuit to a rece

1993-09-13

1995-07-25

Chin, Stephen

Pulse or digital communications

Synchronizers

Frequency or phase control using synchronizing signal

370107, 375200, H04L 700

Patent

active

054369355

ABSTRACT:
A synchronizing circuit comprises a controllable timer (9) and a PN-code generator (10) controllable thereby with at least three outputs (11.1, 11.2, 11.3), for the production of at least three PN-code signals phase-shifted with respect to one another. The PN-code signals phase-shifted with respect to one another are correlated, in parallel correlation paths, with the received signal. Upon the presence of a time drift, the phase position of the trailing PN-code signal, for example, is changed so that this signal is now leading. Thereby, the control range is shifted. At the same time, reassignment is effected between the correlation path and the demodulating output in such a way that in all cases the correlation path that is in the middle with respect to time and that has the maximum correlation power is utilized for demodulation.

REFERENCES:
patent: 4221005 (1980-09-01), La Flame
patent: 4638494 (1987-01-01), Kartchner et al.
patent: 5090023 (1992-02-01), Watanabe et al.

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