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
055685080
ABSTRACT:
The present invention provides a novel frequency Interlaced Geometric Harmonic Modulation (IGHM) system. The IGHM system operates in two modes, a preamble mode and a traffic mode. During the preamble mode, n+1 frequencies are each offset by a predetermined phase in a transmit unit and passed through a channel to a receive unit. The set of phases is used as the spreading code in the transmit unit, and also acts as an `address` of desired receive units. The receive unit monitors preamble signals to determine the phases. When it recognizes a set of phases, or `address`, which pertains to itself, the receive unit stores the phases and uses these phases to despread and decode the appended message. After the preamble mode is finished, the IGHM modulator enters the traffic mode and requests the message to be transmitted from the message source. Two traffic carrier waveforms are created, the first by multiplying tones, each having its specific phase, and the second by shifting all components of the first carrier waveform up by the fundamental frequency. A message is encoded in each of the traffic carrier waveforms and transmitted to a receive unit. The receive unit detects a preamble carrier and recovers the particular preamble phases to be used as the despreading `key`. The receive unit then employs the phases in separating and despreading the received signal to recover both of the transmitted messages.
REFERENCES:
patent: 4628517 (1986-12-01), Schwarz et al.
patent: 5063560 (1991-11-01), Yerbury et al.
U.S. patent application entitled "Dynamic Code Division Multiple Access Communication System", (Attorney Docket No. RD-24193) J. E. Hershey, A. A. Hassan, G. J. Saulnier.
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.
"A 200-MHz Double-Sideband to Single-Sideband Converter in 1-mm CMOS Generated by Silicon Compiler", by R. Hawley, T-j Lin, H. Samueli, 1992 Symposium on VLSI Circuits Digest of Technical Papers, pp. 72-73.
Chin Stephen
General Electric Company
Gluck Jeffrey W.
Snyder Marvin
Zale Lawrence P.
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