Multiplex communications – Wide area network – Packet switching
Patent
1991-01-28
1993-09-21
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 691, H04J 102
Patent
active
052475158
ABSTRACT:
The present invention provides a highly efficient, high speed, and low power method and apparatus for extraction of a single signal from a set of frequency division multiplexed (FDM) signals. The apparatus operates on an analytical digital FDM-type group of signals to decompose the overall signal spectrum by octaves until a single signal or channel is selected. The signal selection is accomplished by transferring received FDM signals into a bandsplitting filter where the spectrum is divided into an upper and lower half-band spectrum. The upper half-band is complex shifted into the lower haIf-band and one half-band eliminated from further consideration. The selected half-band is decimated by a factor of two and recirculated through the filter where it is repetitively half-band filtered, complex shifted, and decimated until a desired single channel remains. The signal data from one processing pass is interleaved with data from previous passes to increase processing efficiency and speed.
REFERENCES:
patent: 3806655 (1974-04-01), Hekimian et al.
patent: 4412325 (1983-10-01), Molo
patent: 4792943 (1988-12-01), Gockler
patent: 4881222 (1989-11-01), Goeckler et al.
Caldwell Wilfred G.
Hamann H. Frederick
Hsu Alpus H.
Montanye George A.
Olms Douglas W.
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