New OFDM peak-to-average power reduction scheme

This paper describes a new peak-to-average power ratio (PAPR) reduction scheme for orthogonal frequency division multiplexing (OFDM). A time domain version of the OFDM signal is generated using an oversized inverse discrete Fourier transform (DFT). This results in trigonometric interpolation. The interpolated signal is clipped. To remove the resulting out-of-band components the clipped signal is filtered through the use of a forward and inverse DFT The filter passes the wanted in-band discrete frequencies while nulling the out-of-band components. The new scheme gives lower PAPR than other clipping techniques. Results are presented for the power spectral density and in-band distortion when the scheme is followed by a non-ideal amplifier. No change to the receiver is required so the scheme is compatible with existing communications standards.