PTS-based PAPR reduction in fixed WiMAX system with Grouping Phase Weighting (GPW)

Abstract

WiMAX is a wireless technology that was developed to overcome the limitations of wireline networks to meet the needs of Broadband Wireless Access (BWA) services to customers. As standardized, fixed WiMAX uses OFDM as its physical air interface. Therefore, it also suffers from high PAPR. To solve this problem, Partial Transmit Sequence (PTS) is used in this paper due to its better performance among other PAPR reduction techniques. Unfortunately, in conventional PTS, an exhaustive search over all combinations of allowed phase weighting factors is needed. This process leads to high computational complexity. Hence, Grouping Phase Weighting (GPW) is used to simplify search complexity and still maintain to provide effective PAPR reduction as conventional PTS. The simulation is conducted to IEEE 802.16d system with various mandatory modulation types and channel coding rates. The derived results show that the choice of modulation type does not give significant effect on the PAPR reduction. The higher channel coding rate gives higher PAPR reduction.