Digitales Übertragungsverfahren mit Pseudo-Mehrstufen und bipolaren Kodierungstechniken.

摘要

A digital communication system comprises a transmitter including a (1, 0, -1) precoder (11) for precoding a unipolar input digital data stream and a bipolar converter (12) for converting the output signal of the (1, 0, -1) precoder into a bipolar signal. The bipolar signal is transmitted through a metallic transmission line (13) to a receiver. The receiver comprises an analog-to-digital converter (14) for converting the multilevel of the transmitted signal to digital form, and a line equalization filter (15) for equalizing losses encountered during propagation through the transmission line. A (1,1) equalizer (16) is provided for equalizing the output signal of the line equalization filter. A clock recovery circuit (18) derives sample timing pulses from the output of the line equalization filter. A decoder (17) responds to the sample timing pulses to detect symbols from the output signal of the (1, 1) equalizer to generate a replica of the original digital data stream.