國立臺灣大學電信工程學研究所馮世邁2006-07-262018-07-052006-07-262018-07-051999-07-31http://ntur.lib.ntu.edu.tw//handle/246246/20183The DMT (discrete multitone modu- lation) technique has been widely applied to data transmission over fading channels of twisted pairs. It has been shown that the DMT system with ideal lters can achieve within 8 to 9 dB of the channel capacity of ADSL. The DFT based DMT system is proposed as a practical DMT implementation but its optimality is never asserted. In this report we will show that the DFT based DMT systems are asymptotically optimal although they are not opti- mal for nite number of channels. The DFT based DMT system and the DMT system with ideal l- ters achieve the same bound. However, for a mod- est number of channels the optimal transceiver can provide substantial gain over the DFT based sys- tem.application/pdf250710 bytesapplication/pdfzh-TW國立臺灣大學電信工程學研究所transceiverdiscrete multitone modu- lation (DMT)optimal DMTreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/20183/1/882213E002080.pdf