One of the major drawbacks of OFDM system is the high peak-to-average power ratio (PAPR). This high PAPR causes nonlinear distortion of the high power amplifier (HPA). Among the studies for PAPR reduction, the partial transmit sequence (PTS) is an attractive technique to prevent nonlinear distortion. However, it causes high computational complexity. Moreover, although the random sub-block partition method can obtain the optimum PAPR reduction, it is difficult to design the random sub-block partition method in a systematic manner. In this paper, we propose a new systematic sub-block partition method which shows low computational complexity and effective PAPR reduction. Simulation results show that the PAPR performance of the proposed PTS is closely similar to the random partitioning PTS, while it has low computational complexity.Index Terms-orthogonal frequency division multiplexing, peak-to-average power ratio, partial transmit sequence.sub-block partition method which obtains low computational complexity and effective PAPR reduction. This paper is organized as follows: Section II presents the OFDM system and ordinary PTS. Section III introduces the proposed PTS and discusses the computational complexity. The simulation results of the proposed PTS as compared with ordinary PTS are shown in Section IV. Finally, the conclusions are presented in Section V. II. SYSTEM MODELA. OFDM and PAPR An OFDM signal is the sum of many overlapping orthogonal sub-channels of equal bandwidth. The OFDM signal of N subcarriers is given by

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