Patent ID: 6665349
Filing Date: 2003-12-16
Classification: H04L

Abstract:
A digital transmission scheme for use in digital subscriber line (DSL) communication systems comprising a channel with bandwidth of 1/Tc Hz, employing M subcarriers for transmission of blocks of M symbols, each taken from a symbol constellation over M subchannels, wherethe transmission over the i-th subchannel, with i=0, . . . , Mâˆ’1, takes place at a modulation rate of 1/(miTc) symbols/s, the i-th subchannel has a bandwidth of 1/(miTc) Hz, where the numbers mi satisfy the condition &Sum;i=0M-1&it;â€ƒ&it;1mi=1at least one subchannel has spectral nulls at the bandedges, and at least one subchannel has zero guard bands.