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    Improving the BER and PAPR performances of conventional OFDM waveform with sequential LLWT-PTS-AC method
    (Gazi Univ, Fac Engineering Architecture, 2024) Tengizler, Bekir; Caliskan, Efe Kaan; Gulbaz, Alihan; Ozen, Ali
    Purpose: In this study, it is suggested to combine PTS and AC methods with LWT transform using Lazy wavelet to reduce PAPR in wireless communication systems using classical OFDM waveform. A new method combining the PAPR improvement provided by PTS and AC techniques on multi-carrier Communication systems and the BER performance provided by LWT is presented in this study. Theory and Methods: The proposed method is given in Figure A. In Figure A, randomly generated serial input data is modulated in the M-Ary Modulation Block. It is then propagated by applying the inverse Lifting wavelet transform to the data modulated in the ILWT Block. Next, in the PTS Block, the phases of emittedsymbols are changed. Then the phase-changed signals are subjected to IFFT processing. After the IFFT process, the signal with the lowest PAPR value is selected and transmitted to the AC Block by adding CP in the CP+ Block. The produced waveform after clipping processes in the AC Block is sent from the frequency selective channel and reaches the receiving side after the AWGN is distorted. The desired performance criteria are calculated by using the data obtained at the output of the M-Ary De-Modulation Block by applying the opposite of the operations on the transmitter side on the receiver side. Results: When the obtained PAPR results are analyzed, it is understood that the suggested waveform for the 1E-3 PAPR value is 0.5 dB better than the PTS-AC-OFDM waveform and 8 dB better than the K-OFDM waveform. In addition, when the BER performances are examined, it is observed that the suggested waveform for the 1E-4 BER level is 6 dB better than the PTS-AC-OFDM and K-OFDM waveforms. Conclusion: In this article, significant gains were obtained in both BER performances and PAPR performances thanks to the proposed method. Thus, despite the slightly increased computational complexity, the proposed LLWT-PTS-AC-OFDM method has yielded a high-performance next-generation OFDM waveform in this study.