Multiplex communications – Wide area network – Packet switching
Patent
1995-03-20
1996-05-21
Hsu, Alpus H.
Multiplex communications
Wide area network
Packet switching
370 23, 375205, 375208, 375358, 375295, 375316, 455 381, H04K 100
Patent
active
055196926
ABSTRACT:
A set of phases defining an `address` and a `spreading key` is selected. These are employed in determining a preamble waveform and a traffic waveform. The preamble carrier waveform is a sum of a set of tones each offset by its phase, whereas the traffic carrier waveform is the product of these same offset tones. The tones have frequencies which are geometrically increasing multiples of a fundamental frequency. The phases and magnitudes of the preamble and traffic carrier waveforms are determined and prestored in a transmit and receive unit storage device. An inverse discrete Fourier Transform unit (IDFT) in the transmit unit receives the phase preamble offsets and magnitudes from the storage unit and creates a preamble carrier signal transmitted to the receive unit which determines if the phases match those which it is to listen to. If not, the following message is ignored; if they are, the following message is despread and decoded. IDFT creates a traffic carrier waveform from the traffic phases and magnitudes. Binary information is encoded in the carrier, processed and transmitted to the receive unit. A discrete Fourier Transform unit converts the received signal into phases and magnitudes. A dot product unit determines a dot product of the phase and magnitudes of the received signal and the traffic carrier waveform over a number of frequencies. A decision unit determines a binary message from the dot product.
REFERENCES:
patent: 5204874 (1993-04-01), Falconer et al.
patent: 5218619 (1993-06-01), Dent
patent: 5309474 (1994-05-01), Gilhouser et al.
patent: 5398258 (1995-03-01), Su et al.
Hassan Amer A.
Hershey John E.
Saulnier Gary J.
General Electric Company
Hsu Alpus H.
Ngo Ricky Q.
Snyder Marvin
Zale Lawrence P.
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