Carrier frequency synchronization device using two different B/W

Details Carrier frequency synchronization device using two different B/W Carrier frequency synchronization device using two different B/W

1994-01-12

1996-07-30

Coles, Sr., Edward L.

Pulse or digital communications

Receivers

Angle modulation

375327, 375376, 375365, 329346, H03D 302, H03D 318, H03D 324, H04L 700

Patent

active

055419658

ABSTRACT:
A carrier synchronization device determines and compensates for differences in synchronization between a local carrier and a received modulated signal to be demodulated by the local carder. The device includes an apparatus determining an error signal .epsilon.(t) representative of synchronization errors. This error signal may be filtered, with different loop bandwidths, either by a first low-pass filter (Hf.sub.1 or by a second low-pass filter (Hf.sub.2) in order to generate a control signal u(t) for control of a local oscillator. A lock mode detector compares the control signal with a delayed replica of this control signal and selects one of the filters depending on whether the device operates in the lock-in mode or in the capturing mode. The lock mode detector is programmed to switch automatically from one mode to the other. The device can be used for the synchronization of symbol-block format OFDM signals.

REFERENCES:
patent: 3909735 (1975-09-01), Anderson et al.
patent: 4215239 (1980-07-01), Gordy et al.
patent: 4473805 (1984-09-01), Guhn
patent: 4539707 (1985-09-01), Jacobs et al.
patent: 4573208 (1986-02-01), Jacobs et al.
patent: 4718116 (1988-01-01), Jacobs et al.
patent: 4855689 (1989-08-01), Kinkel
patent: 5065107 (1991-11-01), Kumar et al.
patent: 5425057 (1995-06-01), Paff

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