Carrier tracking loop for QPSK demodulator

Details Carrier tracking loop for QPSK demodulator Carrier tracking loop for QPSK demodulator

1994-10-13

1996-11-26

Chin, Stephen

Pulse or digital communications

Receivers

Automatic frequency control

375330, 375261, 4551922, H04L 2706, H03D 322

Patent

active

055793452

ABSTRACT:
A carrier tracking loop that uses a frequency locked loop (FLL) and incorporates synchronized matched filters to minimize complexity of the system. The synchronized matched filters eliminate out-of-band interference while minimizing computation. The carrier tracking loop has an improved error signal generation to extend a frequency range and by employing error signal normalization, which extends the dynamic range of the amplitude of the input signal and allows the frequency to flywheel when signal fading occurs.

REFERENCES:
patent: 4143322 (1979-03-01), Shimamura
patent: 4318049 (1982-03-01), Mogenson
patent: 4466108 (1984-08-01), Rhodes
patent: 4475218 (1984-10-01), Takeda et al.
patent: 4592075 (1986-05-01), Tsukamoto
patent: 4787096 (1988-11-01), Wong
patent: 4879728 (1989-11-01), Tarallo
patent: 5440587 (1995-08-01), Ishikawa et al.
Connelly, "Design of the Westinghouse Series 1000 Mobile Phone," IEEE, pp. 347-350, May 18, 1993.
Connelly, "The Westinghouse Series 1000 Mobile Phone: Technology and Applications," IEEE, pp. 375-379, May 18, 1993.

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