Carrier acquisition scheme for QAM and QPSK data

Details Carrier acquisition scheme for QAM and QPSK data Carrier acquisition scheme for QAM and QPSK data

1990-02-16

1991-08-20

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 82, 375120, 375 39, 329307, H03D 302

Patent

active

050420526

ABSTRACT:
The invention involves an apparatus for recovering the carrier signal in OPSK or QAM data. First an energy directed phase detector controls a voltage controlled oscillator so that the output signal has a phase that is within a few degrees of the carrier phase. Following this coarse acquisition, the system clock timing is recovered and established. A decision directed phase detector, using the system clock information, then controls the VCO to adjust the output signal phase to within a very small tolerance of the actual carrier phase.

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patent: 4262264 (1981-04-01), Vandegraaf
patent: 4475218 (1984-10-01), Takeda et al.
patent: 4501002 (1985-02-01), Auchterlonie
patent: 4571550 (1986-02-01), Head
patent: 4642573 (1987-02-01), Noda et al.
patent: 4691176 (1987-09-01), Hsiung et al.
patent: 4704582 (1987-11-01), Dixon et al.
patent: 4757272 (1988-07-01), Okada et al.
patent: 4866739 (1989-09-01), Agazzi et al.
patent: 4868513 (1989-09-01), Piercy et al.
patent: 4901332 (1990-02-01), Williams et al.
patent: 4926447 (1990-05-01), Corsetto et al.
Universal Carrier Recovery Loop for QASK and PSK Signal Sets by LeClert and P. Van Damme, IEEE Transactions on Communications, vol. Com-31, No. 1, Jan. 1983.
Data-Aided Carrier Tracking Loops by Lindsay and Simon, IEEE Trans. on Communication Technology, vol. Com-19, No. 2, Apr. 1971.

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