Demodulator for combined digital amplitude and phase keyed modul

Details Demodulator for combined digital amplitude and phase keyed modul Demodulator for combined digital amplitude and phase keyed modul

1975-09-08

1977-08-02

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

325346, 325349, 329105, 329112, 329122, 329135, 329167, H03D 300, H03D 500, H04L 2722

Patent

active

040399613

ABSTRACT:
A digital carrier signal demodulation circuit is used in the carrier digital transmission system utilizing a 16-ary APK (Amplitude and Phase Keying) signal produced by the vector superposition of a second path signal consisting of a four-phase shift keying signal upon each phase of a first path signal consisting of a four-phase shift keying signal, the level of the second path signal being lower than that of the first path signal. The received 16-ary APK signal is detected with the reference carrier extracted from the received signal, regenerated to reproduce the base band pulses of the first path signal. The recovered base band pulses remodulate the reference carrier to produce the first path signal. The phases of the recovered first path signal and received signal are compared to phase lock a voltage controlled oscillator thereby producing the reference character.

REFERENCES:
patent: 3849730 (1974-11-01), Ho
patent: 3878475 (1975-04-01), Okano et al.

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