Carrier recovery circuit for use in a multi-level phase shift ke

Details Carrier recovery circuit for use in a multi-level phase shift ke Carrier recovery circuit for use in a multi-level phase shift ke

1979-02-16

1982-03-02

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329104, 329122, 375 86, H03D 318

Patent

active

043180493

ABSTRACT:
In a demodulator for use with a multi-level phase shift keying (p.s.k.) signal having N phase levels, the p.s.k. signal which includes a carrier signal is frequency multiplied by a factor N in a multiplier filtered and frequency divided by the factor N to enable the carrier signal to be reconstituted at a terminal. To enable the demodulator to work at different data rates, and to enable filters to have sufficiently precise characteristics, the received p.s.k. signal is initially converted to base-band in mixers to which is applied a locally generated signal nominally at the carrier frequency.

REFERENCES:
patent: 3638125 (1972-01-01), Goell
patent: 3835404 (1974-09-01), Nakamura et al.

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