Reduced complexity of spread spectrum OFDM for PAPR reduction and its basic performance

OFDM is one of the most promising techniques for the high speed next generation mobile communication. However, it has a high peak to average power ratio. In this paper, we propose spread spectrum (SS)-OFDM for PAPR reduction. In this method, each subcarrier forms Nyquist pulse the same way to OSSR-OFDM which we proposed in. The results of computer simulation show that our proposal with a large roll-off factor can reduce PAPR effectively compared to that of conventional OFDM and CI/OFDM, especially, the complexity is greatly reduced compared to OSSR-OFDM. There is a little degradation in BER performance and no out-of-band emissions. Furthermore, our proposal can achieve good BER performance in non linear channel.