DIGITAL COMMUNICATION SYSTEM USING PARTIAL RESPONSE AND BIPOLAR CODING TECHNIQUES

摘要

A digital communication system comprises a transmitter including a (1,0,-1) precoder for precoding a unipolar input digital data stream and a bipolar converter 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 to a receiver. The receiver comprises a digitizer for digitizing the transmitted signal, and a line egualization filter for equalizing losses encountered during propagation through the transmission line. A (1, 1) converter is provided for converting the output signal of the line equalization filter in a manner opposite to the bipolar converter. A clock recovery circuit derives sample timing pulses from the output of the line equalization filter. A decoder responds to the sample timing pulses to detect symbols from the output signal of the (1, 1) converter to generate a replica of the original digital data stream.