Non-Stationary Noise Robustness of ADSL Transceivers When Applying DSM

E. Van den Bogaert, T. Bostoen, R. Zeroual, B. Van Wauwe, F. Van der Schueren, R. Cendrillon, and M. Moonen


Dynamic Spectrum Management, ADSL and noiserobustness.


Dynamic spectrum management (DSM) comprises a new set of techniques for multi-user power allocation in digital subscriber line (DSL) networks. One particular DSM algorithm is known as iterative water-filling, on which this study focuses. Iterative water-filling minimizes the transmit power while achieving the target bit rate. This is equivalent to decreasing the noise margin, hence lowering the robustness against non-stationary noise, as compared to today's DSL margin-adaptive (MA) operation. The noise robustness of DSL modems translates into the stability of the DSL link. This paper describes measurement results of non stationary-noise robustness of DSM-enabled ADSL modems and compares it with the standard, margin adaptive ADSL operation. Additionally, the causes for the bad noise resilience are detailed and a new bit swap procedure is introduced showing better noise robustness.

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