DefinePK

Abstract

Orthogonal frequency division multiplexing system is considered one of the important technologies, which used in the high-speed wireless communication system. Although, it has many advantages such as high data rate, ability to combat the multipath fading channels and more efficiency for utilization the bandwidth, the same time has some obstacles also. The peak to average power ratio considers the major drawback of OFDM system. In the OFDM system, some instantaneous power outputs increase greatly and become so far greater than the mean power of the system with the condition the phases of these carriers are same, this is defined the high PAPR, which causes running the system devices in the nonlinear region leading deterioration in performance of OFDM system. In this paper, we present the characteristics of PAPR with two cases normal and special cases (when the OFDM signal has large consistency samples). At the same time, the parameters that influence to PAPR performance have been analyzed and simulated by using MATLAB software. The simulation results show the numbers of sub-carriers, modulation schemes and over sampling rate influence to PAPR performance. It is observed that the numbers of sub-carrier have the significant influence on PAPR performance. However, over sampling rate and modulation schemes have a small effect on PAPR performance.