Synchronous demodulator for multi-phase PSK signal

Details Synchronous demodulator for multi-phase PSK signal Synchronous demodulator for multi-phase PSK signal

1980-03-25

1982-07-13

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329104, 329122, 375 83, H03D 318, H04L 2722

Patent

active

043397255

ABSTRACT:
An N-phase PSK demodulator is disclosed wherein all circuits therein operate in a frequency band equal to or below the carrier band. The locally reproduced carrier is generated by a phase locked loop in combination with a frequency converter means and a divide-by-two frequency divider. The frequency converter means consists of n identical frequency converter circuits connected in series, where 2.sup.n =N. For a 2-phase PSK demodulator where n=1, the 2-phase PSK modulated wave is applied as a first input and the reproduced carrier divided by two is applied as a second input to the frequency converter circuit. A mixer and filter provide as an output the difference frequency between the first and second inputs. The latter output is multiplied by two and applied as the input to the phase locked loop. Where n>1, the first input of each frequency converter circuit except the first is the output from the preceeding circuit, and the output from the last frequency converter circuit is the input to the phase locked loop.

REFERENCES:
patent: 3336534 (1967-08-01), Gluth
patent: 3745458 (1973-07-01), Nakamura et al.
patent: 3835404 (1974-09-01), Nakamura et al.

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