Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1985-04-01
1986-12-23
LaRoche, Eugene R.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329110, 375 83, 375 94, H03D 306, H03D 318
Patent
active
046314865
ABSTRACT:
A technique for deriving a phase reference for PSK demodulation uses the absolute values of phase vectors as they are received to establish a reference with which the individual phase vectors are compared for data demodulation. Over some span of N successively received signals (phase vectors), the received phase vectors are successively analyzed to derive a hypothetical reference phase vector with which the vector symbols are to subsequently compared for data demodulation. The symbol values are temporarily buffered as they are received. As each phase vector is received, all possible (i.e. M-ary) phase values, referenced to the value of the received phase vector, are compared to a stored reference. Each of these M-ary possible phase values is vector-summed with the stored reference and the resulting vector sum having the largest magnitude is then substituted for the stored reference and is used by the next received vector symbol to further refine the reference vector. This process is carried out successively for each of the received phase vector of the N-symbol span, at the completion of which the successively refined value of the stored reference vector is used to demodulate the previously received and buffered N symbols of the span of interest.
REFERENCES:
patent: 3675129 (1972-07-01), Melvin
Harris Corporation
LaRoche Eugene R.
Lee James C.
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