Abstract

Discrete multitone (DMT) modulation partitions a band-limited transmission channel into a number of independent, parallel subchannels and maximizes performance by sending more bits over those subchannels with large signal-to-noise ratios. The combination of DMT modulation with powerful coding techniques results in a high-performance transceiver that may be used in a variety of high-speed applications. This study investigates the performance of a concatenated coding scheme consisting of an inner trellis code and outer Reed-Solomon code, when applied to a DMT system. Theoretical coding gain projections are derived for several band-limited channels that are representative of the asymmetric digital subscriber line (ADSL) application. Some laboratory test results obtained from a DMT prototype for ADSL are also presented. >

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