Novel Low-Complexity Partial Transmit Sequences Scheme for PAPR Reduction in OFDM Systems Using Adaptive Differential Evolution Algorithm

  • Authors:

  • Chien-Erh Weng;Chuan-Wang Chang;Chuang-Hsien Chen;Ho-Lung Hung

  • Affiliations:

  • Department of Electronic Communication Engineering, National Kaohsiung Marine University, Kaohsiung City, Taiwan, ROC 81157;Department of Electrical Engineering, Chienkuo Technology University, Changhua City, Taiwan;Metal Industries Research and Development Centre, Taichung City, Taiwan, ROC;Department of Electrical Engineering, Chienkuo Technology University, Changhua City, Taiwan

  • Venue:
  • Wireless Personal Communications: An International Journal
  • Year:
  • 2013

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Abstract

A low-complexity partial transmit sequence (PTS) technique for reducing the peak-to-average power ratio (PAPR) of an orthogonal frequency division multiplexing signal is presented. However, the conventional PTS scheme requires an exhaustive searching over all combinations of allowed phase factors. Consequently, the computational complexity increases exponentially with the number of the subblocks. This paper presents a novel approach to the PAPR problem to reduce computational complexity based on the relationship between phase weighing factors and transmitted bit vectors. In this paper, we aim to obtain the desirable PAPR reduction with the low computational complexity. Since the process of searching the optimal phase factors can be categorized as combinatorial optimization with some variables and constraints, we propose a novel scheme, which is based on a stochastic optimization technique called modified differential evolution, to search the optimal combination of phase factors with low complexity. To validate the analytical results, extensive simulations have been conducted, showing that the proposed schemes can achieve significant reduction in computational complexity while keeping good PAPR reduction.