Multiplex communications – Generalized orthogonal or special mathematical techniques – Quadrature carriers
Patent
1995-06-07
1998-01-20
Nguyen, Chau
Multiplex communications
Generalized orthogonal or special mathematical techniques
Quadrature carriers
370527, 370537, 375222, H04J 1100
Patent
active
057107548
ABSTRACT:
A transmission system includes a transmitter and a receiver and transmits a data signal with an analog passband signal through an analog transmission line. The data signal is transformed to a signal representing a descrete data signal point in a vector signal space. The transmitter includes a data signal point generation unit and a vector signal superimposing unit. The analog passband signal is transformed to a base band signal, and the base band signal is superimposed on the signal representing a descrete data signal point. A signal representing the superimposed data signal point is modulated and transmitted through the analog transmission line. The receiver includes a demodulator unit and a decision unit, wherein the data signal point is decided from the signal representing the superimposed data signal point, and the superimposed base band signal is extracted in a subtracter unit by subtracting the decided result from the signal representing the superimposed data signal point. The base band signal is transformed to the analog passband signal. A portion of information carried by the analog passband signal may be converted to a digital signal, and the digital signal is multiplexed in a multiplexer unit with the data signal. The base band signal is superimposed on a signal representing a data signal point generated from a signal generated by the multiplexing.
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Kaku Takashi
Kawada Noboru
Okita Ryoji
Fujitsu Limited
Nguyen Chau
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