Apparatus for enabling the duplex operation of a transmitter and

Details Apparatus for enabling the duplex operation of a transmitter and Apparatus for enabling the duplex operation of a transmitter and

1982-12-13

1985-05-28

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 38, H04B 156

Patent

active

045204764

ABSTRACT:
An apparatus for enabling full duplex operation of a co-located transmitter and receiver on the same frequency. Directional couplers in the transmit and receive transmission lines (or line) provide continuous samples of transmit and receive signals to an adaptive combiner. The combiner includes a ninety degree quadrature hybrid for producing in-phase and quadrature signals from the transmit sample, inverters for each of the in-phase and quadrature signals to selectively invert them, attenuators to controllably attenuate each of the in-phase and quadrature signals, and a summer to add the selectively inverted and attenuated in-phase and quadrature signals with the receive signal sample to cancel portions of the receive signal deriving from the transmit signal.

REFERENCES:
patent: 3928853 (1975-12-01), Olson
patent: 4320498 (1982-03-01), Justice
patent: 4370741 (1983-01-01), Haass
patent: 4393494 (1983-07-01), Belforte et al.

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