Pulse or digital communications – Repeaters – Testing
Patent
1995-03-20
1996-10-22
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375267, 375299, 455 59, H04B 169, H04B 712
Patent
active
055685099
ABSTRACT:
A traffic carrier waveform W.sub.n (.PHI.,R;t) being the product of a number of tones is employed in transmitting blocks of information from a transmit unit to a receive unit. The tones are geometrically increasing multiples of a frequency of a fundamental tone. Each tone incorporates a tone phase. The selection of these tone phases uniquely identifies each transmitted signal. The tone phases also is used as a `key` in converting a message signal into a direct wide spectrum signal for communication. To insure that third parties do not decode the transmitted message, the tone phases are transformed to seed phases by a method known to both the transmit and receive units, but not to third parties. The seed phases are then transmitted by intermittent preamble carrier waveform to the receive unit which transforms these into the tone phases and decodes the message signal. The seed phases may be dynamically changed according to a sequence known or generated by both the transmit unit and receive unit. In another embodiment, the tone phases may also be prestored in both the transmit and receive unit, and there is no need to calculate and transmit seed phases.
REFERENCES:
patent: 3158864 (1964-11-01), Lehan
patent: 4628517 (1986-12-01), Schwarz et al.
patent: 5034997 (1991-07-01), Iwasaki
patent: 5422952 (1995-06-01), Kennedy et al.
U.S. patent application entitled "Method of Geometric Harmonic Modulation (GHM)", (Attorney Docket No. RD-23786), J. E. Hershey, G. J. Saulnier, A. A. Hassan.
U.S. patent application entitled "Geometric Harmonic Modulation (GHM)-Digital Implementation,", (Attorney Docket No. RD-24194), J. E. Hershey, G. J. Saulnier, A. A. Hassan.
U.S. patent application entitled "Geometric Harmonic Modulation (GHM) for Combined Analog/Digital Transmissions", (Attorney Docket No. RD-24195) J. E. Hershey, G. J. Saulnier, A. A. Hassan.
U.S. patent application entitled "Correction of Multipath Distortion in Wideband Carrier Signals", (Attorney Docket No. RD-24196), J. E. Hershey, G. J. Saulnier.
U.S. patent application entitled "Geometric Harmonic Modulation (GHM)-Analog Implementation", (Attorney Docket No. RD-24203), J. E. Hershey, G. J. Saulnier, A. A. Hassan.
U.S. patent application entitled "Interlaced Geometric Harmonic Modulation", (Attorney Docket No. RD-24223), J. E. Hershey.
Hassan Amer A.
Hershey John E.
Saulnier Gary J.
Chin Stephen
General Electric Company
Gluck Jeffrey W.
Snyder Marvin
Zale Lawrence P.
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