Predistortion technique for communications systems

Details Predistortion technique for communications systems Predistortion technique for communications systems

1990-12-20

1993-10-05

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

455 63, 455 69, 455 88, 375 12, H04B 138, H04B 140

Patent

active

052513289

ABSTRACT:
The problem of noise enhancement is eliminated in communications systems by predistorting the amplitude of the transmitted information signal in a manner which compensates for the amplitude distortion introduced in a portion of the communications channel. In the disclosed embodiments, the communications system includes two signal transceivers which communicate with one another through a communications channel. The communications channel includes two-wire subscriber loops adjacent to each signal transceiver with a four-wire transmission path disposed between the subscriber loops. Each transceiver transmits an information signal which, depending on the system noise characteristics, is predistorted to compensate for all or a portion of the amplitude distortion introduced in a subscriber loop adjacent to that signal transceiver. The predistortion necessary to provide such compensation is determined at each transceiver in response to received signals at that transceiver.

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patent: 4802236 (1989-01-01), Walczak et al.
patent: 4890300 (1989-12-01), Andrews
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