Receiver with two synchronization loops

Details Receiver with two synchronization loops Receiver with two synchronization loops

1995-08-24

1997-07-01

Chin, Stephen

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

375326, H03D 324

Patent

active

056446063

ABSTRACT:
Digital transmission system (10) for digitally modulated signals, comprising a receiving device (14) which includes a demodulator (110), processing apparatus (120) and carrier synchronizing apparatus (16) for estimating and compensating for synchronization errors. The synchronizing apparatus includes a first loop (1) for phase/frequency correction and a second loop (2) for phase correction, the operation of these loops being controlled by a mode detector (130) depending on whether the receiving device is seeking to unlock or lock. The second loop (2) transforms a phase error signal into a phase correction signal which is mixed in mixer (246) with the signal coming from the demodulator. Preferably, the signals are modulated via a coded modulation.

REFERENCES:
patent: 4794623 (1988-12-01), Levesque et al.
patent: 5440268 (1995-08-01), Taga et al.
patent: 5541965 (1996-07-01), Daffara

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