Discrete Multitone Modulation with Least Squares Inverse Channel Filtering

ADSL (asymmetric digital subscriber line) transmission technology meets Internet access requirement quite well and offers telephone companies a technology for connecting virtually all Internet users at megabit rates. The ANSI (American National Standards Institute) proposes discrete multitone (DMT) modulation with DFT (discrete Fourier transform) bases [1] as the carriers for the ADSL system. Recently, discrete wavelet multitone modulation has been studied with non-blind and blind equalization schemes [2,3,4]. In the present paper we propose an entirely different approach which combines the multitone modulation and optimal orthonormal subband coding