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Author: search.filters.author.Pradabpet, ChusitSubject: search.filters.subject.Adaptive peak power reduction (APPR)

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    A new PAPR reduction in OFDM systems using PTS combined with APPR for TWTA nonlinear HPA
    (2008-01-01)
    Pradabpet, Chusit
    ;
    Dejhan, Kobchai
    In this paper, we propose a new Peak-to-Average Power Ratio (PAPR) reduction technique using a partial transmit sequence (PTS) combined with adaptive peak power reduction (APPR) methods. This technique is used in a system based on Orthogonal Frequency Division Multiplexing (OFDM). In order to reduce PAPR, the sequence of input data is rearranged by the PTS for the reduction of PAPR and then fed to the APPR process in the proposed system. The APPR method controls the peak level of the modulation signal by an adaptive algorithm. The proposed method shows the improvement on PAPR, on the power spectrum density (PSD) and on the high performance on bit error rate (BER) of an OFDM system.
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    PAPR reduction in OFDM systems by hybrid algorithm based on the PTS and APPR methods
    (2007-12-01)
    Pradabpet, Chusit
    ;
    Miyanaga, Yoshikazu
    ;
    Dejhan, Kobchai
    In this report, we propose a new PAPR reduction technique by a hybrid algorithm based on a partial transmit sequence (PTS) and adaptive peak power reduction (APPR) method. This technique is used in a system based on Orthogonal Frequency Division Multiplexing (OFDM). OFDM has many orthogonally modulated subcarriers which unexpectedly give a large peak to average power ratio (PAPR) and tends to reduce the power efficiency of a RF amplifier. The input data using the PTS method, a sequence of input data is rearranged for the reduction of PAPR and fed to APPR process. The APPR method controls the peak level of the modulation signal based on an adaptive algorithm which reduces modulation signals over a predefined range. A proposed reduction method consists of these two methods and realizes bolt advantages at the same time. As simulation results, the proposed method shows the improvement on PAPR and also the bit error rate performance of an OFDM system.