Improved Partial Transmit Sequence (PTS) for PAPR Reduction in OFDM System

Abstract

Orthogonal Frequency Division Multiplexing (OFDM) is a modulation technique include multicarrier and become the basis technology applied to the telecommunication field. The information about user carried by a subcarrier is transmitted in each band. OFDM own many advantages which are suitable for high speed data transmission, such as high data rates, high spectral efficiency, robustness to channel fading and immunity to impulse interferences. The major drawback that OFDM suffers is the high peak to average power ratio (PAPR). To transmit the signal with high PAPR, the high power scope amplifiers are needed. Hence, there are several PAPR reduction technique introduced to reduce the PAPR of the OFDM system. PTS technique is one of the PAPR reduction technique. So, the PTS-Clipping technique is used to improve the PTS technique for PAPR reduction. Based on the simulation result, the PAPR of the PTS-Clipping technique have been further reduced by 2.56 dB compared with PTS technique for 512 subcarriers, four subblocks and under 16-QAM at a clipping rate of $${10}^{-3}$$ . As the order of modulation increase, the PAPR for both techniques will also increase. When the number of subblocks increased, the PAPR of OFDM system will decrease.