An Interpolation and Resampling Framework for Efficient Reduction of Peak-to-Average Power Ratio in OFDM Systems

Conventional OFDM systems notoriously suffer from a high peak-to-average power ratio (PAPR), which makes hardware implementation problematic. We propose a general framework for reducing PAPR using a combination of time-domain interpolation and resampling. In essence, this combination allows for both pulse shaping as well as phase changes to be performed. It is demonstrated that the framework offers not only improved flexibility, but also reduced computational complexity compared to existing methods. The former benefit is due to the availability of various user-controllable parameters in the framework, while the latter is a result of performing PAPR reduction directly in the time domain. We also show that the accompanying channel estimation and equalization procedures can be achieved in a practical manner, with only modest modifications. The simulation results illustrate that, even though the complexity requirements are substantially lower, the PAPR reduction capability of this framework is comparable to that of existing PAPR reduction methods.