05251328 is referenced by 39 patents and cites 8 patents.

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.

Title
Predistortion technique for communications systems
Application Number
7/630636
Publication Number
5251328
Application Date
December 20, 1990
Publication Date
October 5, 1993
Inventor
David G Shaw
Middletown
NJ, US
Agent
David R Padnes
Assignee
AT&T Bell Laboratories
NJ, US
IPC
H04B 1/40
H04B 1/38
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