Carrier phase lock detecting apparatus used in PSK-modulated sig

Details Carrier phase lock detecting apparatus used in PSK-modulated sig Carrier phase lock detecting apparatus used in PSK-modulated sig

1993-10-12

1996-07-02

Chin, Stephen

Pulse or digital communications

Receivers

Angle modulation

375329, 329307, H03D 318, H03D 324

Patent

active

055330592

ABSTRACT:
In a PSK-modulating arrangement including a voltage controlled oscillator (VCO), a demodulator, a phase detector and a loop filter, a carrier phase lock detecting apparatus is equipped with the arrangement, the apparatus comprising a first multiplier for inversely modulating a demodulated signal by a reference carrier signal from the VCO, a second multiplier for multiplying the output of the first multiplier by an input PSK-modulated signal and a decision circuit for detecting carrier phase lock in response to the output of the second multiplier.

REFERENCES:
patent: 4121166 (1978-10-01), Matsumoto et al.
patent: 4259740 (1981-03-01), Snell et al.
patent: 4547736 (1985-10-01), Takeda
patent: 4853642 (1989-08-01), Otasi et al.
patent: 4871973 (1989-10-01), Yoshihara
patent: 5147329 (1992-10-01), Iwasaki et al.
patent: 5157694 (1992-10-01), Iwasaki et al.
patent: 5241567 (1993-08-01), Shimakata
H. Ishio, et al., "High Speed 4-Phase PSK Modem Circuits", Review of the Electrical Communication Laboratories, vol. 23, Nos. 7-8, pp. 919-938, Jul.-Aug. 1975.
H. Ishio, et al., "Design and Performance of Carrier Recovery Circuit for 806 Mb/s 4-Phase PSK Transmission System", Abstracts of the Transactions of the Institute of Electronics and Communication Engineers of Japan, vol. 57, No. 10, pp. 22-23, Oct. 1974.

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