Coding for intersymbol interference channels - Combined coding and preceding

This paper describes a new coding scheme for transmission over intersymbol interference (ISI) channels, This scheme, called ISI coding, combines trellis coding with preceding (used to combat ISI), Like the recently introduced preceding scheme of Laroia, Tretter, and Farvardin (LTF), the ISI coder makes it possible to achieve both shaping and coding gains over ISI channels, By combining coding and preceding, however, the ISI coder makes the ''precoding loss'' independent of the number of coset partitions used to generate the trellis code, At high rates (large signal-to-noise ratio (SNR)), this makes it possible to approach the Shannon capacity of an ISI channel, The V.34 (formerly V.fast) international modem standard for high-speed (up to 28.8 kb/s) communication over voice-band telephone lines uses the version of the ISI coder described in Section HV of this paper.