Coherent phase shift keyed demodulator for power line...

Details Coherent phase shift keyed demodulator for power line... Coherent phase shift keyed demodulator for power line...

H - Electricity

03

D

329/16

H03D 3/00 (2006.01) H04L 27/233 (2006.01) H04L 7/04 (2006.01)

Patent

CA 1214227

ABSTRACT OF THE DISCLOSURE A coherent phase shift keyed demodulator provides demodulation of a base band data message through the use of a reference vector signal generator which employs an inter- mediate reference vector generated from the phase of an in- coming 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 asso- ciated 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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