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Multiuser Spectrum Balancing under Inter-Carrier Interference

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3 Author(s)
Wolkerstorfer, M. ; FTW Telecommun. Res. Center Vienna, Vienna, Austria ; Moonen, M. ; Statovci, D.

Inter-carrier interference (ICI) in multicarrier systems results in a coupling among all subcarriers. This greatly complicates the problem of multiuser bit and power allocation, also referred to as spectrum balancing. We propose a Lagrange relaxation of the ICI coupling terms, and an optimal algorithm for solving the resulting relaxed spectrum balancing problem. While this gives us a rate-performance upper bound, based on it we also propose a novel heuristic for computing a lower bound. The relaxation is exemplarily applied to digital subscriber lines (DSL) with asynchronous far-end crosstalk in near-far scenarios. The results confirm the existence of scenarios where the performance upper and lower bounds obtained by the relaxation are significantly tighter than those previously proposed.

Published in:

Communications Letters, IEEE  (Volume:16 ,  Issue: 10 )