Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1997-02-27
1999-07-27
Chin, Stephen
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
375340, 375316, 370342, H03D 100
Patent
active
059303093
ABSTRACT:
A CAP signal is processed by a QAM demodulator network. The QAM network causes the CAP signal to rotate about its center frequency, which rotation is removed prior to conveying the CAP signal to utilization networks. In an analog implementation, the CAP signal is frequency upconverted to be centered at Fad/4 so that the QAM processor can use the usual 1, 0, -1, 0 demodulation sequence to bring the CAP signal to baseband. Alternatively, using digital techniques, frequency upconverting is not needed and the 1, 0, -1, 0 demodulation sequence is replaced with a Numerically Controlled Oscillator and full multiplier to allow the QAM processor the bring the CAP signal to baseband.
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Knutson Paul Gothard
Ramaswamy Kumar
Stewart John
Chin Stephen
Herrmann Eric P.
Kurdyla Ronald H.
Liu Shuwang
Thomson Consumer Electronics Inc.
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