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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