Demodulator for combined digital amplitude and phase keyed...

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

H - Electricity

03

D

329/2

H03D 3/00 (2006.01) H04L 27/227 (2006.01) H04L 27/38 (2006.01) H04L 27/00 (2006.01)

Patent

CA 1076219

ABSTRACT OF THE DISCLOSURE 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 de- tected 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.

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