Demodulator for phase reversal modulation system

Details Demodulator for phase reversal modulation system Demodulator for phase reversal modulation system

1966-03-08

1978-04-11

Moskowitz, Nelson

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329122, 331 6, 331 9, H03K 300

Patent

active

040841286

ABSTRACT:
1. A receiver for use in a PSK signal translation system comprising a voltage tunable local oscillator for continuously generating a reference frequency signal from which the suppressed carrier can be reconstructed, input signal means for an incoming PSK signal, means for adding said reference frequency signal to produce a synthesized carrier which is amplitude modulated by said incoming PSK signal, diode switch means for demodulating synthesized PSK amplitude modulated carrier for causing synchronous phase shifts of the PSK signal components of modulated synthetic carrier in response to the demodulated signals, to thereby provide a continuous unmodulated signal synthesizing the suppressed carrier of the incoming PSK signals; a servo loop, including said oscillator, said signal adding means and said phase shifting means, for locking said oscillator onto said synthesized carrier.

REFERENCES:
proakis et al., "Performance of Coherent Detection Systems Using Decision-Directed Channel Measurements", 3/64, vol. 47, pp. 54-55, IEEE Transactions on Communications Systems.
Costas, "Some Notes on Space Communications", 8/59, pp. 1383-1385, vol. 47, proceedings of IRE.

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