Predistortion technique for communications systems

Details Predistortion technique for communications systems Predistortion technique for communications systems

1995-11-20

1996-11-12

Faile, Andrew

Telecommunications

Transmitter

Measuring, testing, or monitoring of transmitter

455 63, 455 69, 455 83, 375296, H04B 1700

Patent

active

055749909

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 a received narrowband signal at that transceiver. Advantageously, this narrowband signal may be that used to disable echo cancellers and/suppressors in the communications channel.

REFERENCES:
patent: 4368362 (1983-01-01), Chung et al.
patent: 4561111 (1985-12-01), Conner
patent: 4679225 (1987-07-01), Higashiyama
patent: 4994675 (1991-02-01), Levin et al.
patent: 5251328 (1993-10-01), Shaw

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