Autonomous Spectrum Balancing Using Multiple Reference Lines for Digital Subscriber Lines

Crosstalk is the limiting factor of performance in Digital Subscriber Line systems. The use of Dynamic Spectrum Management (DSM) can reduce the effects of crosstalk. For DSM algorithms, there is an important trade-off between the complexity of an algorithm and its performance. The Autonomous Spectrum Balancing (ASB) algorithm uses a virtual reference line (representative of a typical victim in the network) to allow for a favorable trade-off in some scenarios; however, it can often lead to poor performance in many other scenarios. This paper introduces a method of applying ASB with multiple reference lines in order to more consistently gain a favorable trade-off. It is shown that the achievable performance is very close to that of existing state-of-the-art DSM algorithms while requiring significantly fewer interference plus noise measurements.