Patent ID: 6507606
Filing Date: 2003-01-14
Classification: H04L

Abstract:
A method for modulation and demodulation on a discrete multi-tone asymmetric digital subscriber loop, comprising:adapting a first asymmetric digital subscriber loop data pump to operate in a downstream direction using a first weighting network, said first weighting network having a first filter bank including a first plurality of filters, each of said first plurality of filters having a first filter length longer than a first sample size which corresponds to a first discrete Fourier transform size used for the downstream direction; adapting a second asymmetric digital subscriber loop data pump to operate in an upstream direction using a second weighting network, said second weighting network having a second filter bank including a second plurality of filters, each of said second plurality of filters having a second filter length longer than a second sample size which corresponds to a second discrete Fourier transform size used for the upstream direction; adapting a first asymmetric digital subscriber loop data receiver to operate in said upstream direction using an equivalent of said second weighting network; and adapting a second asymmetric digital subscriber loop data receiver to operate in said downstream direction using an equivalent of said first weighting network.