Communication system providing simultaneous two-way transmission

Details Communication system providing simultaneous two-way transmission Communication system providing simultaneous two-way transmission

1981-04-22

1983-04-12

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 24, H04B 156

Patent

active

043800629

ABSTRACT:
A two-wire, carrier-type communication system is provided which enables simultaneous two-way transmission over two-wire circuits in the same spectrum. Carrier signals in quadrature are used to allow separation of signals within the same frequency spectrum. The carrier recovered at each subscriber station is used to demodulate the received signal and, after being phase shifted 90.degree., is applied as carrier to the transmitter modulator. The transmitters at the subscriber stations are thus the same as that at the central office but are locked to the receiver and 90.degree. out of phase. A bidirectional control phase adjustment network at the central station adjusts the phase of the signal received thereby until the received carrier is 90.degree. out of phase with the transmit carrier.

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