Abstract:
FFT, as the key concept in the OFDM system, produces a high PAPR value. Several techniques can be implemented to reduce it, such as the Palm Date Leaf clipping and the Partial Transmit Sequence. Previous researchers have evaluated each technique individually. This paper proposes to evaluate the PAPR value as the effect of combining the Partial Transmit Sequence (PTS) with the Palm Date Leaf (PDL) clipping technique. The evaluation is done with several modulation techniques, such as QPSK, 8-PSK, 16-PSK, 8-QAM, and 16-QAM. Since low PAPR performance is not advantageous if the signal’s BER value worsens, thus the evaluation also considers the BER performance. In this case, the Authors focus on the BER performance over the AWGN channel. The result shows that in all of the scenarios, the PTS technique could improve the signal’s BER and PAPR performance for low CR values such as 5 dB and 7 dB. Additionally, for higher CR values such as 10 dB and 20 dB, the BER performance is similar to the normal OFDM signal. Even so, it provides a consistent PAPR reduction of approximately 3 dB. Do note that the PAPR is evaluated at CCDF of 𝟏𝟏𝟏𝟏−𝟑𝟑. This way, the PTS technique always provides an improvement in signal BER performance. As for the PAPR performance, the PTS technique can improve all cases except for 8-QAM and 16-QAM signals with clipping technique at low clipping ratio such as 5 dB. However, the PTS technique still requires Side Information (SI), and it has high computational complexity.
