Higher State Trellis Coded Modulation for Asymmetric Digital Subscriber Transceivers

M. Arif and N.M. Sheikh (Pakistan)


Spectral Efficiency, Trellis Coded Modulation (TCM), Asymmetric Digital Subscriber Line (ADSL).


A 128 state 4D TCM code for ADSL assuming AWGN is analyzed. The performance is compared with 16 state (3, 2, 5) linear 4D code developed by L. F. Wei [1]. Simulation shows an improvement of 20% in spectral efficiency. We have also analyzed 8-DMT Symbol based decoding for Wei’s code 16 state (3, ,2 ,5) in up stream direction and achieved .9 db gain.

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