A novel search method to reduce PAPR of an OFDM signal using partial transmit sequences: Research Articles

Authors:
Hao-Chung Tu;Chien-Ching Chiu
Affiliations:
Department of Electrical Engineering, Tamkang University, Tansui, Taiwan, ROC;Department of Electrical Engineering, Tamkang University, Tansui, Taiwan, ROC
Venue:
International Journal of Communication Systems
Year:
2007

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New PAPR Reduction in OFDM System Using Hybrid of PTS-APPR Methods with Coded Side Information Technique

IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences

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Abstract

One of the main drawbacks of orthogonal frequency division multiplexing (OFDM) is the high peak-to-average power ratio (PAPR) of the transmitted OFDM signal. Partial transmit sequence (PTS) technique can improve the PAPR statistics of an OFDM signal. As ordinary PTS technique requires an exhaustive search over all combinations of allowed phase factors, the search complexity increases exponentially with the number of sub-blocks. In this paper, we propose a novel PTS technique with reduced complexity that each level inverts twice of phase factor bits from previous level. Then we also use initial random phase sequence to find the better search way of PAPR reduction. Numerical results show that the proposed method can achieve significant reduction in search complexity with little performance degradation. Copyright © 2006 John Wiley & Sons, Ltd.