AG Kommunikationstheorie

Thema:

Power Allocation Optimization in Adaptive ODFMA Systems with Equally Subdivided Rates

Abstract:

In OFDMA, water-filling is the optimal way to distribute the power over a given subcarrier assignment if different rates per subcarrier are allowed. This implies a large signalling overhead for dynamic allocations, because the transmitter has to inform the receivers about the mapping scheme on every subcarrier. Transmitting the same rate on every of a user's subcarriers can reduce the signalling overhead significantly. In this talk it is analyzed if the power-reducing effect of a smaller overhead can compensate the less efficient power distribution due to the additional constraint. Equally subdividing the rates implies a verification and possibly a modification of subcarrier assignment heuristics for multi-user scenarios.



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