Costas loop and data identification apparatus

Details Costas loop and data identification apparatus Costas loop and data identification apparatus

1995-10-31

1997-07-29

Chin, Stephen

Pulse or digital communications

Receivers

Angle modulation

375376, 329308, 329309, H03D 318, H03D 324

Patent

active

056527691

ABSTRACT:
A costas loop includes a comparator, and a BPSK-modulated signal which is converted into a binary signal by the comparator is latched by a D-FF according to an oscillation signal from a VCO. An output of the D-FF becomes a demodulated signal. On the other hand, a phase-difference between the BPSK-modulated signal and the oscillation signal is detected by a phase-comparator, and the phase-difference is applied to the VCO via a loop filter. An oscillation frequency of the VCO is thus controlled according to a phase-comparison result.

REFERENCES:
patent: 3806815 (1974-04-01), Fletcher et al.
patent: 4344178 (1982-08-01), Waters
patent: 4704582 (1987-11-01), Dixon et al.
patent: 5025455 (1991-06-01), Nguyen
patent: 5438594 (1995-08-01), Podolak
patent: 5440268 (1995-08-01), Taga et al.
patent: 5528195 (1996-06-01), Lu et al.

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