next up previous contents
Next: Constellation encoder Up: ADSL Previous: Tone ordering

Constellation encoding

Constellation encoder can be implemented with or without trellis coding. The system performance can be improved by block processing of Wei's 16-state 4-dimensional trellis code. It is possible to achieve 2-3 dB better coding gain and the overall improvement in coding gain by well designed ADSL system can be about 5.5 dB [1].

Kimmo K. Saarela
Mon Mar 6 12:47:27 EET 1995