Peak-to-Average Power Ratio Reduction Based on Cyclic Iteration Partial Transmit Sequence

Partial transmit sequence (PTS) is an efficient algorithm to solve the problem of high peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM), but its exhaustive search of phase factors results in high computational complexity. A PTS algorithm based on cyclic iteration (C-IPTS) is proposed to solve this problem. In the proposed algorithm, the phase factor achieved by the previous iteration is set as the initial phase factor of the current search, thus the search is more close to the optimal phase factor after repetition, as a result, the PAPR performance is eliminated effectively. Moreover, the effect of initial phase factor is decreased significantly. Simulation shows that C-IPTS algorithm can achieve good PAPR reduction with low computational complexity.

I. Introduction

Orthogonal frequency division multiplexing (OFDM) system is considered as one of the most promising techniques for high data rate wireless communication systems. Due to its high spectrum efficiency, OFDM has been adopted for a number of applications, such as the standard for digital radio audio broadcasting (DAB), HIPERLAN/2 and IEEE 802.16. However, OFDM system suffers from the problem of inherent peak-to-average power ratio (PAPR), which brings on the OFDM signal distortion in the nonlinear region of high power amplifier (HPA) and the signal distortion induces the degradation of bit error rate (BER) [1]–[2].