Coherent phase shift keyed demodulator for power line communicat

Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...

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329110, 329122, 329126, 375 82, 375 94, H04L 2722

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active

045160791

ABSTRACT:
A coherent phase shift keyed demodulator provides demodulation of a baseband data message through the use of a reference vector signal generator which employs an intermediate reference vector generated from the phase of an incoming carrier signal which, under certain conditions, is reversed in phase prior to being combined with a previous value of the reference vector to generate an updated reference vector signal. The demodulator incorporates a polarity sampler, an image signal generator and a zero crossing detector associated with a phase angle vector generator. A summation vector generator receives a signal from the phase angle vector generator and, in turn, provides signals to a phase detector and a reference vector generator. The demodulator also includes apparatus to perform concurrent carrier detection and bit synchronization operations.

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