Pulse or digital communications – Receivers – Automatic frequency control
Patent
1996-09-26
1999-02-09
Le, Amanda
Pulse or digital communications
Receivers
Automatic frequency control
375345, 375355, 375362, H04L 704
Patent
active
058704388
ABSTRACT:
A system for resynchronizing the timing and carrier phases of a modem receiver signal to enable the receiver to quickly reacquire the timing phase and the carrier phase, and thereby restart the demodulation process. The system provides accurate estimates of the timing and carrier phases, as well as a gain correction factor to provide for proper alignment for decoding. The discrete Fourier transform of the received signal is multiplied by the complex conjugate of the discrete Fourier transform of the transmitted signal to produce estimates of the desired phases. Gain control and carrier phase control are performed to determine corresponding error signals to adapt the resultant estimated timing and carrier phases, and gain correction.
REFERENCES:
patent: 5513221 (1996-04-01), Parr et al.
patent: 5654982 (1997-08-01), Goodson et al.
Le Amanda
O'Shaughnessy James P.
Oh Susie H.
Rockwell Int'l. Corp.
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