Abstract

A multidimensional 16-state trellis coded modulation (MTCM) is given as an option in the asymmetric digital subscriber line (ADSL) standard based on discrete multitone (DMT) techniques. To further improve the transmission performance, instead of this MTCM, we propose to use bandwidth-efficient turbo trellis coded modulation (TTCM) in ADSL DMT systems. We show that by using turbo codes, we can obtain 6 dB coding gain for a bit error rate (BER) of 10/sup -6/ in AWGN channels and more than 6.8 dB coding gain for a BER of 10/sup -7/ using a concatenated coding scheme.

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