Source-Aware Adaptive Power Allocation in OFDM Systems for Rate Constrained Applications

In a wireless OFDM system, due to channel fading all subcarriers are not always usable for an acceptable performance. In this paper, we propose two source-aware and channel-adaptive OFDM resource allocation approaches that judiciously selects the optimum required subcarriers. The first scheme increases the power efficiency while maintaining a chosen reception quality, whereas the second scheme shows a significant improvement in reception quality for a given power budget.