Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1995-03-20
1996-10-22
Chin, Stephen
Pulse or digital communications
Receivers
Interference or noise reduction
375285, 375260, 375200, 455 59, 455 65, H04B 712, H04L 104
Patent
active
055685226
ABSTRACT:
The present invention provides a system for determining, and correcting for, channel-induced distortion in transmitted wideband carrier signals. During a synchronization, or sounding mode, known as the preamble mode, a wideband signal consisting of a number of tones, which may be those of geometric harmonic modulation (GHM), each having a phase of zero are transmitted to a receive unit. At the receive unit, the phases for each tone are extracted. Since each tone is at a different frequency, a snapshot of the change in phase over a number of frequencies can be determined. These phase changes are employed in determining the generalized phase distortion over frequency equation which is used to remove the phase distortion induced by the channel before decoding of the signal. The device then operates in its traffic mode thereby transmitting information to a receive unit which uses the phase distortion information to remove phase distortion induced by the channel and then decode a message signal.
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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 entiled "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 Implemenatation", (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 "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.
Hershey John E.
Saulnier Gary J.
Chin Stephen
General Electric Company
Gluck Jeffrey W.
Snyder Marvin
Zale Lawrence P.
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