EFFECT OF AMPLITUDE CLIPPING IN DMT-ADSL TRANSCEIVERS

An analytical expression is derived for the signal-to-noise ratio due to the clipping of the amplitude of a DMT signal to a predetermined le vel. Using this expression, it is shown that a significant reduction i n the number of bits (between 2 and 3 bits) of the A/D-D/A convertor c an be obtained by clipping, while keeping the same signal-to-noise rat io as when clipping is not applied. These results indicate that clippi ng can be applied to DMT-based ADSL transceivers without system perfor mance degradation and with the important advantage of reducing its VLS I implementation complexity.