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Orthogonal Frequency Division Multiplexing is a powerful technique employed in wireless systems suffering from frequency selectivity. The adaptive modulation is a powerful technique for maximizing the data throughput of subcarriers allocated to a user. In this paper, we consider a simple adaptive loading algorithm for Orthogonal Frequency Division Multiplexing based wireless communication systems for signal spectrum optimization. The algorithm is based on the margin adaptive loading criterion and its performance over 5 GHz indoor wireless channels. Simulation results show a 6 dB improvement for BER of 10-2 over fixed modulation.
Date of Conference: 27-30 June 2010