Effects of oversample in tone reservation scheme for PAPR reduction in OFDM systems

Abstract

Despite of many advantages of OFDM, high PAPR is one of the main problems that prevent OFDM from being used more generally in broadband systems. Many approaches such as clipping and filtering, coding, SLM, PTS, and tone reservation (TR) have been studied to reduce the peak magnitude of OFDM symbols. In these approaches, tone reservation method constructs an additive PAPR reduction signal that uses a small subset of reserved subcarriers. These reserved tones are orthogonal with the data tones and, hence, cause no additional distortion, no side information, and low implementation cost. However, TR schemes with oversample or not affects PAPR reduction performance significantly. TR schemes without oversample would bring peak value up again easily when pass by HPA and then bring out-of-band (OOB) distortion. In this paper, we evaluated proposed TR scheme with oversample in OFDM systems and focused on the effects of oversample technique to our proposed system. The simulation results show that the scheme can provide good performance and fast convergence.