Joint Improved Nyquist Pulse Shaping and Clipping for PAPR Reduction of OFDM Signals

One major disadvantage of OFDM is that the time domain OFDM signal which is a sum of several sinusoids leads to high peak to average power ratio (PAPR). The precoding scheme based on pulse shaping is an effective and flexible way for reducing the peak-to-average power ratio (PAPR) of OFDM signals. Clipping technique is the most simple reduction PAPR method. However, clipping degrades the bit-error-rate (BER) performance and causes spectral spreading. In this paper, proposed scheme will be introduced, which combines precoding and clipping technique to reduce PAPR. Simulation results show that the proposed scheme may obtain significant PAPR reduction while the BER of performance of system is improved at the same clipping parameter.