A novel search method to reduce PAPR of an OFDM signal using partial transmit sequences |
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Authors: | Hao‐Chung Tu Chien‐Ching Chiu |
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Affiliation: | Department of Electrical Engineering, Tamkang University, Tansui, Taiwan, ROC |
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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. |
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Keywords: | orthogonal frequency division multiplexing peak‐to‐average power ratio partial transmit sequence |
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