AG Kommunikationstheorie

Thema:

On the Solution Space of Resource Allocation Problems in OFDMA Systems: Structural Analysis and Algorithm Design

Abstract:

The users in an OFDMA system compete for two resources: Bandwidth (subcarriers) and power. Finding an "optimal" allocation of resources is a complex optimization problem that requires simultaneous solving of a combinatorical problem and a continuous one. There exist both suboptimal algorithms as well as approaches from convex optimization for the "Weighted Sum Rate Maximization" problem, which will be the focus of this talk.

To gain insight into the structural properties of the problem and the sets involved, a symmetry-based approach is employed. Based on this, the concept of weighted subcarrier allocations is introduced and shown to provide a suitable subset of the set of all possible subcarrier allocations. The unique properties of this subset are utilized in the design of two low-complexity algorithms. Simulation results for both algorithms are presented, which not only show the quality of the suboptimal solutions, but at the same time prove the viability of the concept of weighted allocations.



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