Asymptotical optimality of DFT based DMT transceivers

Author

Lin, Yuan-Pei ; Phoong, See-May

Author_Institution

Dept. of Electr. & Control Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan

Volume

4

fYear

1999

fDate

36342

Firstpage

503

Abstract

The DMT (discrete multitone modulation) technique has been widely applied to data transmission over fading channels of twisted pairs. It has been shown that the DMT system with ideal filters 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 paper we will show that the DFT based DMT systems are asymptotically optimal although they are not optimal for finite number of channels. The DFT based DMT system and the DMT system with ideal filters achieve the same bound. However, for a modest number of channels the optimal transceiver can provide substantial gain over the DFT based system as will be demonstrated by examples

Keywords

channel capacity; data communication; discrete Fourier transforms; fading channels; modulation; transceivers; DFT based DMT transceivers; asymptotical optimality; channel capacity; data transmission; discrete multitone modulation; fading channels; ideal filters; optimal transceiver; Additive white noise; Bit rate; Colored noise; Data communication; Fading; Finite impulse response filter; Gaussian noise; OFDM modulation; Quadrature amplitude modulation; Transceivers;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1999. ISCAS '99. Proceedings of the 1999 IEEE International Symposium on

Conference_Location

Orlando, FL

Print_ISBN

0-7803-5471-0

Type

conf

DOI

10.1109/ISCAS.1999.780052

Filename

780052