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Adaptive Equalization for Cable Data Transmission System

IP.com Disclosure Number: IPCOM000061826D
Original Publication Date: 1986-Sep-01
Included in the Prior Art Database: 2005-Mar-09

Publishing Venue

IBM

Related People

Authors:
Bond, PW [+details]

Abstract

An adaptive equalization system is provided for a digital data cable transmission system having predistortion at the transmission end and equalization at the receiving end. A limiter at the receiving end is provided in front of the equalization filter. The limiter operates to clip the predistortion pulses at short distances, thereby avoiding differentiation of transitions within a pulse provided by the predistortion, while allowing pulses attenuated normally by the travel across a long length of transmission line to pass unaffected to the equalization filter. Thus, the limiter and predistortion form a simple adaptive equalization system controlled by cable attenuation. The figure shows a simple block diagram of the system configuration. The predistorted data from the transmission line is applied to a limiter 10.