Multiplex communications – Wide area network – Packet switching
Patent
1989-01-05
1991-10-15
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370120, 370123, 455189, 455324, H04J 100
Patent
active
050581074
ABSTRACT:
A digital intermediate frequency (IF) receiver for frequency division multiplexed (FDM) signals including analog circuitry for receiving FDM signals and an analog-to-digital (A/D) converter for converting the received signals to a sampled digital received signal. A digital complex mixer responsive to the digital output of the A/D converter translates the spectrum of the sampled digital received signal to center the desired FDM channel at zero frequency (DC). Digital low pass filtering isolates the desired channel centered at DC, and a digital complex mixer can be used to translate the isolated selected channel to a predetermined IF frequency. The in-phase portion of the digital IF centered selected channel or the DC centered complex envelope selected channel can then be provided to appropriate demodulation or decoder networks.
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patent: 4590595 (1986-05-01), Morimura
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Multirate Digital Signal Processing, Crochiere and Rabiner, Prentice-Hall, Inc., Englewood Cliffs, New Jersey 07632, 1983, pp. 42-47.
Devendorf Don C.
Ichiroku Kikuo
Kelley Edwin A.
Stone Wade J.
Alkov Leonard A.
Denson-Low Wanda K.
Gudmestad Terje
Hsu Alpus H.
Hughes Aircraft Company
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