Peak-to-Average Power Ratio (PAR) Reduction for Acoustic OFDM Systems

Projecte fet en col.laboració amb el Massachusetts Institute of Technology (MTI

Peak-to-Average Power Ratio (PAR) Reduction for Acoustic OFDM Systems

Projecte fet en col.laboració amb el Massachusetts Institute of Technology (MTI

Peak-to-Average Power Ratio (PAR) Reduction for Acoustic OFDM Systems

Projecte fet en col.laboració amb el Massachusetts Institute of Technology (MTI

Peak-to-Average Power Ratio (PAR) reduction for acoustic OFDM systems

A major drawback of orthogonal frequency division multiplexing (OFDM) is its large peak-to-average power ratio (PAR). Techniques for PAR reduction have been extensively studied for radio communication systems. While these techniques are applicable to acoustic systems, we take a different approach that aims to capitalize on the fundamental differences between the acoustic and radio systems, namely the fact that acoustic transmissions are inherently band-limited. We extend the tone reservation technique to the out-of-band carriers, and design efficient methods for constructing OFDM signals with lower PAR. Two approaches are investigated, one based on a gradient algorithm, and another that uses random sequences. Simulation results show that our technique can provide PAR reduction without the loss in data rate.United States. Office of Naval Research (ONR Grant N00014-07-1-0202)National Science Foundation (U.S.) (grant 0532223