Block coding capacity of digital subscriber lines by the structured-channel technique

The block coding capacity of digital subscriber lines (DSLs) is determined by the structured-channel signaling (SCS) technique. The SCS technique decomposes the physical channel into multiple parallel independent signaling subchannels by exploiting the combined eigenstructure of the channel and the correlation structure of the additive near-end crosstalk (NEXT). The block coder and receiver structures of each subchannel are obtained by maximizing the signal-to-noise ratio at the output of each receiver, and the input energy per symbol for each coder is obtained by maximizing the capacity of the channel, subject to an input power constraint. Computer simulation studies are presented for a sample of loop configurations governed by the carrier serving area (CSA)