We present an optimal, eecient power allocation algorithm for discrete multitone modulation (DMT). Using ee-cient lookup table searches and a Lagrange multiplier bisection search, our algorithm converges much faster to the optimal solution than existing techniques and can replace the use of subopti-mal methods because of its low computational complexity. A fast algorithm is developed and pseudo...

The discrete multitone (DMT) modulation/demodulation scheme is the standard transmission technique in the application of asymmetric digital subscriber lines (ADSL) and very-high-speed digital subscriber lines (VDSL). Although the DMT can achieve higher data rate compared with other modulation/demodulation schemes, its computational complexity is too high for costefficient implementations. For e...

An overview of alien crosstalk cancellation for DSL systems with multiple pairs is here presented. It is shown that when a common crosstalk source affects the receivers of multiple pairs, the noise exhibits a certain correlation among the pairs. In a DMT system, the frequency-domain noise samples are most strongly correlated between pairs when they correspond to the same tone. Thus, noise decor...

Discrete multitone modulation transceivers (DMTs) have been shown to be very useful for data transmission over frequency selective channels. The DMT scheme is realized by a transceiver that divides the channel into subbands. The efficiency of the scheme depends on the frequency selectivity of the transmitting and receiving filters. The receiving filters with good stopband attenuation are also d...

In this study, a theoretical systematic approach is introduced as solution of the bandwidth problem multi-tone network systems. This proposes use unused harmonic components non-linear distortion produced by semiconductor laser diode, which used source in infrastructure fiber optic communication system. order to separate these frequency from others, it possible add protocol each difference signa...