Patent ID: 7054556
Filing Date: 2006-05-30
Classification: H04B,H04J

Abstract:
1. A method of identifying and detecting channels in a multiplexed communications network, comprising the steps of: modulating each channel to be identified with a respective combination of at least two continuous dither tones, each dither tone having a precisely determinable phase relationship sufficient for coherent processing of said each dither tone; and detecting the dither tones to detect said channels, the step of detecting the dither tones comprising performing an FFT (Fast Fourier Transform) operation to detect dither tones of a channel having a relatively high power and performing coherant averaging of FFT results over a plurality of FFT operations, comprising an accumulation of the FFT amplitudes in accordance with their said respectivve determinable phase relationships for successive FFT periods, to detect dither tones of a channel having a relatively low power.