Modeling and optimization of the line-driver power consumption in xDSL systems
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RESEARCH
Open Access
Modeling and optimization of the line-driver power consumption in xDSL systems ¨ 1,3 and Bakti D Putra1 Martin Wolkerstorfer1* , Steffen Trautmann2 , Tomas Nordstrom
Abstract Optimization of the power spectrum alleviates the crosstalk noise in digital subscriber lines (DSL) and thereby reduces their power consumption at present. In order to truly assess the DSL system power consumption, this article presents realistic line driver (LD) power consumption models. These are applicable to any DSL system and extend previous models by parameterizing various circuit-level non-idealities. Based on the model of a class-AB LD we analyze the multi-user power spectrum optimization problem and propose novel algorithms for its global or approximate solution. The thereby obtained simulation results support our claim that this problem can be simplified with negligible performance loss by neglecting the LD model. This motivates the usage of established spectral optimization algorithms, which are shown to significantly reduce the LD power consumption compared to static spectrum management. Keywords: Digital subscriber lines, Energy-efficient, Line driver, Optimization
Introduction This article analyzes the modeling and optimization of the power consumption in multi-carrier digital subscriber line (DSL) transceivers. The line-driver (LD) power consumption accounts for the largest part in the DSL power budget and scales with the transmit power (TP) [1-3]. With few exceptions [2,4,5], previous study has therefore focussed on minimizing the transmit sumpower [3,6-8] through power spectral optimization, also known as dynamic spectrum management (DSM) [9]. A key feature of this objective is its separability by subcarriers, which is a prerequisite for the Lagrange decomposition [10] of the DSM problem. This decomposition results in low-complexity and even distributed DSM implementations [11-13]. We hypothesize that although TP minimization does not assume knowledge of the underlying LD power consumption, it achieves energy-efficiency at a negligible performance loss compared to a TP optimization taking the LD explicitly into account. In order to support this claim and to realistically assess energy savings by DSM it is indispensable to have an accurate model of the LD power *Correspondence: [email protected] 1 FTW Telecommunications Research Center Vienna, Donau-City-Straße1, A-1220 Vienna, Austria Full list of author information is available at the end of the article
consumption as a function of the TP. Hence, after providing more background information in Section ‘Background information’, we begin in Section ‘Line driver models’ by deriving accurate such models, which are applicable for any DSL technology and different LD classes. While we deem a proof of our hypothesis intractable, we exemplarily provide analytical and numerical evidence supporting our hypothesis based on the proposed enhanced class-AB LD model in Sections ‘Optimization models and analysis’ and ‘Empirical optimization study’, respectively. For that p
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