Broadcast channel optimal spectrum balancing (BC-OSB) with per-modem total power constraints for downstream DSL

Author

Le Nir, Vincent ; Moonen, Marc ; Guenach, Mamoun ; Verlinden, Jan

Author_Institution

SISTA/ESAT, K.U. Leuven, Leuven, Belgium

fYear

2007

fDate

3-7 Sept. 2007

Firstpage

2189

Lastpage

2193

Abstract

In this paper we investigate the problem of optimal power allocation in a BC by exploiting the duality with MAC. We first describe an algorithm for power allocation under a total power constraint. Then, the BC-OSB algorithm is devised for BC power allocation under per-modem total power constraints, where the Lagrange multipliers of the dual problem formulation are transferred into the optimization function by means of a precoding matrix, such that the MAC-BC duality can again be exploited. Simulation results are given for a VDSL2 scenario, and also for a theoretical multi-user independent flat-fading Rayleigh environment.

Keywords

MIMO communication; Rayleigh channels; digital subscriber lines; precoding; wireless channels; BC power allocation; BC-OSB algorithm; Lagrange multipliers; MAC-BC duality; VDSL2 scenario; broadcast channel optimal spectrum balancing; downstream DSL; multiuser independent flat-fading Rayleigh environment; optimal power allocation; optimization function; per-modem total power constraints; precoding matrix; Covariance matrices; Europe; Linear programming; MIMO; Optimization; Resource management; Signal processing algorithms;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing Conference, 2007 15th European

Conference_Location

Poznan

Print_ISBN

978-839-2134-04-6

Type

conf

Filename

7099196