DSL Advances

Appendix 11A—Multiuser Detection

Multiuser detection (MUD) is a technique that can be used without any need for standardization or coordination of any type, and simply enhances receiver performance by trying to detect and eliminate all large crosstalking signals. MUD has limited benefit as it typically only works for a few large crosstalkers and has high complexity. Sections 11.3 and 11.4 show DMT systems can migrate naturally to mutually beneficial spectra that simplify the design so much that effectively MUD is not necessary and would add nothing. However, not all DSLs are DMT, thus leaving MUD as the only solution sometimes. Static SM standards attempt to impose some regulation on future DSL systems that do not coordinate in any way. Debate ...