Date Added: Apr 2011
Wireless local area networks are known to apply the same transmit power and modulation type over all employed OFDM subcarriers. Recent studies show that this can lead to significant performance degradations. As future WLANs will employ even larger bandwidths - 80MHz and above - the authors study in this paper loading strategies to improve the system performance. In particular, they study the performance of adaptive modulation, power loading and bit loading not only from the physical layer point of view but also by accounting for necessary protocol extensions to accommodate the required control overhead.