Patent ID: 7327793
Filing Date: 2008-02-05
Classification: H04L

Abstract:
1. A method of effecting peak reduction in a Discrete Multitone signal, comprising the steps of: (i) providing a predetermined signature waveform; (ii) for each frame of samples of the DMT signal (x(n (iii) comparing the absolute maximal value with a predetermined threshold value and, if the absolute maximal value is not less than the predetermined threshold value (T), (iv) multiplying the predetermined signature waveform by a scaling factor (C) to obtain a scaled signature waveform, and (v) subtracting said scaled signature waveform from said DMT signal frame in the region of said signal peak so as to reduce said peak to a level substantially equal to said predetermined threshold value, wherein said predetermined signature waveform has fewer samples than said DMT signal, and said predetermined signature waveform is aligned with said signal peak prior to subtraction, said predetermined signature waveform first being multiplied by the scaling factor (C) to match said DMT signal, and said scaling factor (C) being determined from said absolute maximal value |M| in accordance with the equation