Margin Optimization in Digital Subscriber Lines Employing Level-1 Dynamic Spectrum Management

This paper investigates the optimization of margins in a digital-subscriber-line (DSL) system employing level-1 dynamic spectrum management. A central spectrum management center determines the empirical statistics of the noise variance of each DSL line using long-term observations and optimizes the margin allocation using the statistics. Compared to current systems that allocate ad-hoc margin values, the presented algorithms improve the line's stability, throughput-guarantee, and politeness to other lines in the binder.