Power savings analysis of peak-to-average power ratio in OFDM

Orthogonal frequency division multiplexing (OFDM) has become a popular modulation method in high-speed wireless networks because of its robustness against multipath fading, its simple equalizer structure, and its high bandwidth efficiency. However, in the time domain, the OFDM signal has a large peak-to-average power ratio (PAR), which translates to low power amplifier efficiencies. In this paper we examine and quantify the power savings from PAR reductions. We also relate any power savings to the computational power costs of selected mapping, which is a prominent PAR reduction scheme that results in negligible performance degradation.