Dynamic Spectrum Management for Energy-Ef.cient Transmission in DSL
Dynamic spectrum management (DSM) is an important technique for mitigating crosstalk noise in multi-user digital subscriber line (DSL) environments. Until now, most of the proposed algorithms for DSM have been designed solely for the purpose of bitrate maximization. These algorithms assume a fixed maximum total power and neglect the energy consumption in DSL modems. However, since recently there is a strong interest in the DSL field to reduce energy consumption as shown, e.g., by the European Commissions code of conduct on energy consumption of broadband equipment. In contrast to traditional DSM, this paper will show how DSM can be used for minimizing the energy consumption. We will formulate a global optimization problem for energy minimization and discuss several of its peculiarities compared to the current DSM problems. Furthermore, we derive an iterative, dual-based and semi-distributed algorithm for its local solution, which we call energy-efficient spectrum balancing (EESB). The performance of the algorithm is evaluated through simulations, which show similar results to optimal schemes. In addition, EESB achieves substantial energy savings that can be exploited by adapting the transmit powers to users?bitrate demand.
DSL dynamic spectrum management energy efficiency dual relaxation.
Martin Wolkerstorfer Driton Statovci Tomas Nordstrom
Telecommunications Research Center Vienna (ftw.),Donau-City-StraBe1,A-1220 Vienna,Austria
国际会议
广州
英文
2008-11-19（万方平台首次上网日期，不代表论文的发表时间）