Optimized Resource Allocation for Upstream Vectored DSL Systems With Zero-Forcing Generalized Decision Feedback Equalizer

In modern Digital Subscriber Line (DSL) systems, twisted pairs are significantly shortened because of the deployment of Optical Network Units (ONU) or Remote Terminals (RT). The channel condition in the high-frequency band is dramatically improved so that high data rates can be delivered. In addition, the system performance becomes more interference-constrained. To combat interference in DSL effectively, many techniques of Dynamic Spectrum Management (DSM) are proposed. Among the technologies of DSM, vectored DSL (also called vectoring) is the most powerful interference cancellation technique because it actively cancels the interference via signal level co-operations rather than just avoids the interference by polite spectrum use.