Two-wire full duplex frequency division multiplex modem system h

Details Two-wire full duplex frequency division multiplex modem system h Two-wire full duplex frequency division multiplex modem system h

1986-12-22

1989-01-17

Griffin, Robert L.

Multiplex communications

Wide area network

Packet switching

379410, H04B 900

Patent

active

047992140

ABSTRACT:
A two-wire full duplex frequency division multiplex (FDM) modem system having a unit for cancelling a transmission signal, taking into consideration the line distortion characteristics. The FDM modem system includes two modem units connected through the two-wire full duplex transmission line.
Each modem unit includes a unit for modulating a transmission data, a unit for synthesizing the modulated transmission signal and a reception signal, a unit for adding the signal from the synthesizing unit and a signal, a unit for demodulating the reception signal, and a unit for generating the signal supplied to the adding unit cancelling a transmission echo signal included in the signal from the synthesizing unit, from the signal modulated at the modulating unit and the signal from the adding unit. The adding unit subtracts the signal generated at the echo cancellation signal generation unit from the signal from the synthesizer unit.
The FDM may further include a unit, for receiving the signal from the adder unit, passing a signal having the transmission frequency band, and supplying same to the echo cancellation signal generation unit as a signal for compressing the line characteristics.

REFERENCES:
patent: 4072830 (1978-02-01), Gitlin et al.
patent: 4162378 (1979-07-01), Baudoux et al.
patent: 4349889 (1982-09-01), Van Den Elzen et al.
patent: 4464545 (1984-08-01), Werner
patent: 4481385 (1984-11-01), Kalfs
patent: 4571720 (1986-02-01), Chevreau et al.
patent: 4577309 (1986-03-01), Barazeche et al.
patent: 4587382 (1986-05-01), Yang

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