ADSL transcievers applying DSM and their non-atationary noise robustness

Dynamic spectrum management (DSM) comprises a new set of techniques for multi-user power allocation and/or detection in digital subscriber line (DSL) networks. At the Alcatel Research and Innovation Labs we have recently developed a DSM test bed, which allows the performance of DSM algorithms to be evaluated in practice. With this test bed we have evaluated the performance of a DSM level 1 algorithm known as iterative water-filling in an ADSL scenario. This paper describes the results of, on the one hand, the performance gains achieved with iterative water-filling, and, on the other hand, the non-stationary noise robustness of DSM-enabled ADSL modems. It will be shown that DSM trades off non-stationary noise robustness for performance improvements. A new bit swap procedure is then introduced to increase the noise robustness when applying DSM