Patent Number: 6,298,036

Title: Multiplex transmission system wherein analog signal is transformed to baseband, random-transformed and superimposed on dispersed signal points invector signal space

Abstract: A transmission system for transmitting a data signal with an analogpassband signal through a analog transmission line. The data signal istransformed to a signal representing a descrete data signal point in avector signal space. The analog passband signal is transformed to a baseband signal, and the base band signal is superimposed on the signalrepresenting a descrete data signal point. A signal representing thesuperimposed data signal point is modulated and transmitted through theanalog transmission line. In a receiver, the data signal point is decidedfrom the signal representing the superimposed data signal point, and thesuperimposed bass band signal is extracted by subtracting the decidedresult from the signal representing the superimposed data signal point.The base band signal is transformed to the analog passband signal. Aportion of information carried by the analog passband signal may beconverted to a digital signal, and the digital signal is multiplexed withthe data signal. Further, a portion of information of each of a pluralityof analog passband signals may be converted to a digital signal, and thedigital signal is multiplexed with each other, and the other portion ofthe information is transformed to a base band signal, and the base bandsignal is superimposed on a signal representing a data signal pointgenerated from a signal generated by the multiplexing.

Inventors: Kaku; Takashi (Kawasaki, JP), Okita; Ryoji (Kawasaki, JP), Kawada; Noboru (Kawasaki, JP)

Assignee:

International Classification:

Expiration Date: 10/02/2013